Rename flux_kohya_lora_conversion_utils.py

* [MM] add API routes for getting & setting MM cache sizes, and retrieving MM stats

* Update invokeai/app/api/routers/model_manager.py

Co-authored-by: Ryan Dick <ryanjdick3@gmail.com>

* code cleanup after @ryand review

* Update invokeai/app/api/routers/model_manager.py

Co-authored-by: Ryan Dick <ryanjdick3@gmail.com>

* fix merge conflicts; tested and working

---------

Co-authored-by: Lincoln Stein <lstein@gmail.com>
Co-authored-by: Ryan Dick <ryanjdick3@gmail.com>

docs/help/FAQ.md

@@ -196,6 +196,22 @@ tips to reduce the problem:
     === "12GB VRAM GPU"
 
         This should be sufficient to generate larger images up to about 1280x1280.
+		
+## Checkpoint Models Load Slowly or Use Too Much RAM
+
+The difference between diffusers models (a folder containing multiple
+subfolders) and checkpoint models (a file ending with .safetensors or
+.ckpt) is that InvokeAI is able to load diffusers models into memory
+incrementally, while checkpoint models must be loaded all at
+once. With very large models, or systems with limited RAM, you may
+experience slowdowns and other memory-related issues when loading
+checkpoint models.
+
+To solve this, go to the Model Manager tab (the cube), select the
+checkpoint model that's giving you trouble, and press the "Convert"
+button in the upper right of your browser window. This will conver the
+checkpoint into a diffusers model, after which loading should be
+faster and less memory-intensive.
 
 ## Memory Leak (Linux)
 

invokeai/app/api/routers/model_manager.py

@@ -3,8 +3,10 @@
 
 import io
 import pathlib
+import shutil
 import traceback
 from copy import deepcopy
+from enum import Enum
 from tempfile import TemporaryDirectory
 from typing import List, Optional, Type
 
@@ -17,6 +19,7 @@ from starlette.exceptions import HTTPException
 from typing_extensions import Annotated
 
 from invokeai.app.api.dependencies import ApiDependencies
+from invokeai.app.services.config import get_config
 from invokeai.app.services.model_images.model_images_common import ModelImageFileNotFoundException
 from invokeai.app.services.model_install.model_install_common import ModelInstallJob
 from invokeai.app.services.model_records import (
@@ -31,6 +34,7 @@ from invokeai.backend.model_manager.config import (
     ModelFormat,
     ModelType,
 )
+from invokeai.backend.model_manager.load.model_cache.model_cache_base import CacheStats
 from invokeai.backend.model_manager.metadata.fetch.huggingface import HuggingFaceMetadataFetch
 from invokeai.backend.model_manager.metadata.metadata_base import ModelMetadataWithFiles, UnknownMetadataException
 from invokeai.backend.model_manager.search import ModelSearch
@@ -50,6 +54,13 @@ class ModelsList(BaseModel):
     model_config = ConfigDict(use_enum_values=True)
 
 
+class CacheType(str, Enum):
+    """Cache type - one of vram or ram."""
+
+    RAM = "RAM"
+    VRAM = "VRAM"
+
+
 def add_cover_image_to_model_config(config: AnyModelConfig, dependencies: Type[ApiDependencies]) -> AnyModelConfig:
     """Add a cover image URL to a model configuration."""
     cover_image = dependencies.invoker.services.model_images.get_url(config.key)
@@ -797,3 +808,83 @@ async def get_starter_models() -> list[StarterModel]:
         model.dependencies = missing_deps
 
     return starter_models
+
+
+@model_manager_router.get(
+    "/model_cache",
+    operation_id="get_cache_size",
+    response_model=float,
+    summary="Get maximum size of model manager RAM or VRAM cache.",
+)
+async def get_cache_size(cache_type: CacheType = Query(description="The cache type", default=CacheType.RAM)) -> float:
+    """Return the current RAM or VRAM cache size setting (in GB)."""
+    cache = ApiDependencies.invoker.services.model_manager.load.ram_cache
+    value = 0.0
+    if cache_type == CacheType.RAM:
+        value = cache.max_cache_size
+    elif cache_type == CacheType.VRAM:
+        value = cache.max_vram_cache_size
+    return value
+
+
+@model_manager_router.put(
+    "/model_cache",
+    operation_id="set_cache_size",
+    response_model=float,
+    summary="Set maximum size of model manager RAM or VRAM cache, optionally writing new value out to invokeai.yaml config file.",
+)
+async def set_cache_size(
+    value: float = Query(description="The new value for the maximum cache size"),
+    cache_type: CacheType = Query(description="The cache type", default=CacheType.RAM),
+    persist: bool = Query(description="Write new value out to invokeai.yaml", default=False),
+) -> float:
+    """Set the current RAM or VRAM cache size setting (in GB). ."""
+    cache = ApiDependencies.invoker.services.model_manager.load.ram_cache
+    app_config = get_config()
+    # Record initial state.
+    vram_old = app_config.vram
+    ram_old = app_config.ram
+
+    # Prepare target state.
+    vram_new = vram_old
+    ram_new = ram_old
+    if cache_type == CacheType.RAM:
+        ram_new = value
+    elif cache_type == CacheType.VRAM:
+        vram_new = value
+    else:
+        raise ValueError(f"Unexpected {cache_type=}.")
+
+    config_path = app_config.config_file_path
+    new_config_path = config_path.with_suffix(".yaml.new")
+
+    try:
+        # Try to apply the target state.
+        cache.max_vram_cache_size = vram_new
+        cache.max_cache_size = ram_new
+        app_config.ram = ram_new
+        app_config.vram = vram_new
+        if persist:
+            app_config.write_file(new_config_path)
+            shutil.move(new_config_path, config_path)
+    except Exception as e:
+        # If there was a failure, restore the initial state.
+        cache.max_cache_size = ram_old
+        cache.max_vram_cache_size = vram_old
+        app_config.ram = ram_old
+        app_config.vram = vram_old
+
+        raise RuntimeError("Failed to update cache size") from e
+    return value
+
+
+@model_manager_router.get(
+    "/stats",
+    operation_id="get_stats",
+    response_model=Optional[CacheStats],
+    summary="Get model manager RAM cache performance statistics.",
+)
+async def get_stats() -> Optional[CacheStats]:
+    """Return performance statistics on the model manager's RAM cache. Will return null if no models have been loaded."""
+
+    return ApiDependencies.invoker.services.model_manager.load.ram_cache.stats

invokeai/app/invocations/compel.py

@@ -19,8 +19,8 @@ from invokeai.app.invocations.model import CLIPField
 from invokeai.app.invocations.primitives import ConditioningOutput
 from invokeai.app.services.shared.invocation_context import InvocationContext
 from invokeai.app.util.ti_utils import generate_ti_list
-from invokeai.backend.lora import LoRAModelRaw
 from invokeai.backend.model_patcher import ModelPatcher
+from invokeai.backend.peft.lora import LoRAModelRaw
 from invokeai.backend.stable_diffusion.diffusion.conditioning_data import (
     BasicConditioningInfo,
     ConditioningFieldData,

invokeai/app/invocations/denoise_latents.py

@@ -36,9 +36,9 @@ from invokeai.app.invocations.t2i_adapter import T2IAdapterField
 from invokeai.app.services.shared.invocation_context import InvocationContext
 from invokeai.app.util.controlnet_utils import prepare_control_image
 from invokeai.backend.ip_adapter.ip_adapter import IPAdapter
-from invokeai.backend.lora import LoRAModelRaw
 from invokeai.backend.model_manager import BaseModelType, ModelVariantType
 from invokeai.backend.model_patcher import ModelPatcher
+from invokeai.backend.peft.lora import LoRAModelRaw
 from invokeai.backend.stable_diffusion import PipelineIntermediateState
 from invokeai.backend.stable_diffusion.denoise_context import DenoiseContext, DenoiseInputs
 from invokeai.backend.stable_diffusion.diffusers_pipeline import (
@@ -185,7 +185,7 @@ class DenoiseLatentsInvocation(BaseInvocation):
     )
     denoise_mask: Optional[DenoiseMaskField] = InputField(
         default=None,
-        description=FieldDescriptions.mask,
+        description=FieldDescriptions.denoise_mask,
         input=Input.Connection,
         ui_order=8,
     )

invokeai/app/invocations/fields.py

@@ -45,11 +45,13 @@ class UIType(str, Enum, metaclass=MetaEnum):
     SDXLRefinerModel = "SDXLRefinerModelField"
     ONNXModel = "ONNXModelField"
     VAEModel = "VAEModelField"
+    FluxVAEModel = "FluxVAEModelField"
     LoRAModel = "LoRAModelField"
     ControlNetModel = "ControlNetModelField"
     IPAdapterModel = "IPAdapterModelField"
     T2IAdapterModel = "T2IAdapterModelField"
     T5EncoderModel = "T5EncoderModelField"
+    CLIPEmbedModel = "CLIPEmbedModelField"
     SpandrelImageToImageModel = "SpandrelImageToImageModelField"
     # endregion
 
@@ -128,6 +130,7 @@ class FieldDescriptions:
     noise = "Noise tensor"
     clip = "CLIP (tokenizer, text encoder, LoRAs) and skipped layer count"
     t5_encoder = "T5 tokenizer and text encoder"
+    clip_embed_model = "CLIP Embed loader"
     unet = "UNet (scheduler, LoRAs)"
     transformer = "Transformer"
     vae = "VAE"
@@ -178,7 +181,7 @@ class FieldDescriptions:
     )
     num_1 = "The first number"
     num_2 = "The second number"
-    mask = "The mask to use for the operation"
+    denoise_mask = "A mask of the region to apply the denoising process to."
     board = "The board to save the image to"
     image = "The image to process"
     tile_size = "Tile size"

invokeai/app/invocations/flux_denoise.py

@@ -0,0 +1,292 @@
+from typing import Callable, Iterator, Optional, Tuple
+
+import torch
+import torchvision.transforms as tv_transforms
+from torchvision.transforms.functional import resize as tv_resize
+
+from invokeai.app.invocations.baseinvocation import BaseInvocation, Classification, invocation
+from invokeai.app.invocations.fields import (
+    DenoiseMaskField,
+    FieldDescriptions,
+    FluxConditioningField,
+    Input,
+    InputField,
+    LatentsField,
+    WithBoard,
+    WithMetadata,
+)
+from invokeai.app.invocations.model import TransformerField
+from invokeai.app.invocations.primitives import LatentsOutput
+from invokeai.app.services.session_processor.session_processor_common import CanceledException
+from invokeai.app.services.shared.invocation_context import InvocationContext
+from invokeai.backend.flux.denoise import denoise
+from invokeai.backend.flux.inpaint_extension import InpaintExtension
+from invokeai.backend.flux.model import Flux
+from invokeai.backend.flux.sampling_utils import (
+    clip_timestep_schedule,
+    generate_img_ids,
+    get_noise,
+    get_schedule,
+    pack,
+    unpack,
+)
+from invokeai.backend.peft.lora import LoRAModelRaw
+from invokeai.backend.peft.peft_patcher import PeftPatcher
+from invokeai.backend.stable_diffusion.diffusion.conditioning_data import FLUXConditioningInfo
+from invokeai.backend.util.devices import TorchDevice
+
+
+@invocation(
+    "flux_denoise",
+    title="FLUX Denoise",
+    tags=["image", "flux"],
+    category="image",
+    version="1.0.0",
+    classification=Classification.Prototype,
+)
+class FluxDenoiseInvocation(BaseInvocation, WithMetadata, WithBoard):
+    """Run denoising process with a FLUX transformer model."""
+
+    # If latents is provided, this means we are doing image-to-image.
+    latents: Optional[LatentsField] = InputField(
+        default=None,
+        description=FieldDescriptions.latents,
+        input=Input.Connection,
+    )
+    # denoise_mask is used for image-to-image inpainting. Only the masked region is modified.
+    denoise_mask: Optional[DenoiseMaskField] = InputField(
+        default=None,
+        description=FieldDescriptions.denoise_mask,
+        input=Input.Connection,
+    )
+    denoising_start: float = InputField(
+        default=0.0,
+        ge=0,
+        le=1,
+        description=FieldDescriptions.denoising_start,
+    )
+    denoising_end: float = InputField(default=1.0, ge=0, le=1, description=FieldDescriptions.denoising_end)
+    transformer: TransformerField = InputField(
+        description=FieldDescriptions.flux_model,
+        input=Input.Connection,
+        title="Transformer",
+    )
+    positive_text_conditioning: FluxConditioningField = InputField(
+        description=FieldDescriptions.positive_cond, input=Input.Connection
+    )
+    width: int = InputField(default=1024, multiple_of=16, description="Width of the generated image.")
+    height: int = InputField(default=1024, multiple_of=16, description="Height of the generated image.")
+    num_steps: int = InputField(
+        default=4, description="Number of diffusion steps. Recommended values are schnell: 4, dev: 50."
+    )
+    guidance: float = InputField(
+        default=4.0,
+        description="The guidance strength. Higher values adhere more strictly to the prompt, and will produce less diverse images. FLUX dev only, ignored for schnell.",
+    )
+    seed: int = InputField(default=0, description="Randomness seed for reproducibility.")
+
+    @torch.no_grad()
+    def invoke(self, context: InvocationContext) -> LatentsOutput:
+        latents = self._run_diffusion(context)
+        latents = latents.detach().to("cpu")
+
+        name = context.tensors.save(tensor=latents)
+        return LatentsOutput.build(latents_name=name, latents=latents, seed=None)
+
+    def _run_diffusion(
+        self,
+        context: InvocationContext,
+    ):
+        inference_dtype = torch.bfloat16
+
+        # Load the conditioning data.
+        cond_data = context.conditioning.load(self.positive_text_conditioning.conditioning_name)
+        assert len(cond_data.conditionings) == 1
+        flux_conditioning = cond_data.conditionings[0]
+        assert isinstance(flux_conditioning, FLUXConditioningInfo)
+        flux_conditioning = flux_conditioning.to(dtype=inference_dtype)
+        t5_embeddings = flux_conditioning.t5_embeds
+        clip_embeddings = flux_conditioning.clip_embeds
+
+        # Load the input latents, if provided.
+        init_latents = context.tensors.load(self.latents.latents_name) if self.latents else None
+        if init_latents is not None:
+            init_latents = init_latents.to(device=TorchDevice.choose_torch_device(), dtype=inference_dtype)
+
+        # Prepare input noise.
+        noise = get_noise(
+            num_samples=1,
+            height=self.height,
+            width=self.width,
+            device=TorchDevice.choose_torch_device(),
+            dtype=inference_dtype,
+            seed=self.seed,
+        )
+
+        transformer_info = context.models.load(self.transformer.transformer)
+        is_schnell = "schnell" in transformer_info.config.config_path
+
+        # Calculate the timestep schedule.
+        image_seq_len = noise.shape[-1] * noise.shape[-2] // 4
+        timesteps = get_schedule(
+            num_steps=self.num_steps,
+            image_seq_len=image_seq_len,
+            shift=not is_schnell,
+        )
+
+        # Clip the timesteps schedule based on denoising_start and denoising_end.
+        timesteps = clip_timestep_schedule(timesteps, self.denoising_start, self.denoising_end)
+
+        # Prepare input latent image.
+        if init_latents is not None:
+            # If init_latents is provided, we are doing image-to-image.
+
+            if is_schnell:
+                context.logger.warning(
+                    "Running image-to-image with a FLUX schnell model. This is not recommended. The results are likely "
+                    "to be poor. Consider using a FLUX dev model instead."
+                )
+
+            # Noise the orig_latents by the appropriate amount for the first timestep.
+            t_0 = timesteps[0]
+            x = t_0 * noise + (1.0 - t_0) * init_latents
+        else:
+            # init_latents are not provided, so we are not doing image-to-image (i.e. we are starting from pure noise).
+            if self.denoising_start > 1e-5:
+                raise ValueError("denoising_start should be 0 when initial latents are not provided.")
+
+            x = noise
+
+        # If len(timesteps) == 1, then short-circuit. We are just noising the input latents, but not taking any
+        # denoising steps.
+        if len(timesteps) <= 1:
+            return x
+
+        inpaint_mask = self._prep_inpaint_mask(context, x)
+
+        b, _c, h, w = x.shape
+        img_ids = generate_img_ids(h=h, w=w, batch_size=b, device=x.device, dtype=x.dtype)
+
+        bs, t5_seq_len, _ = t5_embeddings.shape
+        txt_ids = torch.zeros(bs, t5_seq_len, 3, dtype=inference_dtype, device=TorchDevice.choose_torch_device())
+
+        # Pack all latent tensors.
+        init_latents = pack(init_latents) if init_latents is not None else None
+        inpaint_mask = pack(inpaint_mask) if inpaint_mask is not None else None
+        noise = pack(noise)
+        x = pack(x)
+
+        # Now that we have 'packed' the latent tensors, verify that we calculated the image_seq_len correctly.
+        assert image_seq_len == x.shape[1]
+
+        # Prepare inpaint extension.
+        inpaint_extension: InpaintExtension | None = None
+        if inpaint_mask is not None:
+            assert init_latents is not None
+            inpaint_extension = InpaintExtension(
+                init_latents=init_latents,
+                inpaint_mask=inpaint_mask,
+                noise=noise,
+            )
+
+        with (
+            transformer_info.model_on_device() as (cached_weights, transformer),
+            # Apply the LoRA after transformer has been moved to its target device for faster patching.
+            PeftPatcher.apply_peft_patches(
+                model=transformer,
+                patches=self._lora_iterator(context),
+                prefix="",
+                cached_weights=cached_weights,
+            ),
+        ):
+            assert isinstance(transformer, Flux)
+
+            x = denoise(
+                model=transformer,
+                img=x,
+                img_ids=img_ids,
+                txt=t5_embeddings,
+                txt_ids=txt_ids,
+                vec=clip_embeddings,
+                timesteps=timesteps,
+                step_callback=self._build_step_callback(context),
+                guidance=self.guidance,
+                inpaint_extension=inpaint_extension,
+            )
+
+        x = unpack(x.float(), self.height, self.width)
+        return x
+
+    def _prep_inpaint_mask(self, context: InvocationContext, latents: torch.Tensor) -> torch.Tensor | None:
+        """Prepare the inpaint mask.
+
+        - Loads the mask
+        - Resizes if necessary
+        - Casts to same device/dtype as latents
+        - Expands mask to the same shape as latents so that they line up after 'packing'
+
+        Args:
+            context (InvocationContext): The invocation context, for loading the inpaint mask.
+            latents (torch.Tensor): A latent image tensor. In 'unpacked' format. Used to determine the target shape,
+                device, and dtype for the inpaint mask.
+
+        Returns:
+            torch.Tensor | None: Inpaint mask.
+        """
+        if self.denoise_mask is None:
+            return None
+
+        mask = context.tensors.load(self.denoise_mask.mask_name)
+
+        _, _, latent_height, latent_width = latents.shape
+        mask = tv_resize(
+            img=mask,
+            size=[latent_height, latent_width],
+            interpolation=tv_transforms.InterpolationMode.BILINEAR,
+            antialias=False,
+        )
+
+        mask = mask.to(device=latents.device, dtype=latents.dtype)
+
+        # Expand the inpaint mask to the same shape as `latents` so that when we 'pack' `mask` it lines up with
+        # `latents`.
+        return mask.expand_as(latents)
+
+    def _lora_iterator(self, context: InvocationContext) -> Iterator[Tuple[LoRAModelRaw, float]]:
+        for lora in self.transformer.loras:
+            lora_info = context.models.load(lora.lora)
+            assert isinstance(lora_info.model, LoRAModelRaw)
+            yield (lora_info.model, lora.weight)
+            del lora_info
+
+    def _build_step_callback(self, context: InvocationContext) -> Callable[[], None]:
+        def step_callback() -> None:
+            if context.util.is_canceled():
+                raise CanceledException
+
+            # TODO: Make this look like the image before re-enabling
+            # latent_image = unpack(img.float(), self.height, self.width)
+            # latent_image = latent_image.squeeze()  # Remove unnecessary dimensions
+            # flattened_tensor = latent_image.reshape(-1)  # Flatten to shape [48*128*128]
+
+            # # Create a new tensor of the required shape [255, 255, 3]
+            # latent_image = flattened_tensor[: 255 * 255 * 3].reshape(255, 255, 3)  # Reshape to RGB format
+
+            # # Convert to a NumPy array and then to a PIL Image
+            # image = Image.fromarray(latent_image.cpu().numpy().astype(np.uint8))
+
+            # (width, height) = image.size
+            # width *= 8
+            # height *= 8
+
+            # dataURL = image_to_dataURL(image, image_format="JPEG")
+
+            # # TODO: move this whole function to invocation context to properly reference these variables
+            # context._services.events.emit_invocation_denoise_progress(
+            #     context._data.queue_item,
+            #     context._data.invocation,
+            #     state,
+            #     ProgressImage(dataURL=dataURL, width=width, height=height),
+            # )
+
+        return step_callback

invokeai/app/invocations/flux_lora_loader.py

@@ -0,0 +1,53 @@
+from invokeai.app.invocations.baseinvocation import BaseInvocation, BaseInvocationOutput, invocation, invocation_output
+from invokeai.app.invocations.fields import FieldDescriptions, Input, InputField, OutputField, UIType
+from invokeai.app.invocations.model import LoRAField, ModelIdentifierField, TransformerField
+from invokeai.app.services.shared.invocation_context import InvocationContext
+
+
+@invocation_output("flux_lora_loader_output")
+class FluxLoRALoaderOutput(BaseInvocationOutput):
+    """FLUX LoRA Loader Output"""
+
+    transformer: TransformerField = OutputField(
+        default=None, description=FieldDescriptions.transformer, title="FLUX Transformer"
+    )
+
+
+@invocation(
+    "flux_lora_loader",
+    title="FLUX LoRA",
+    tags=["lora", "model", "flux"],
+    category="model",
+    version="1.0.0",
+)
+class FluxLoRALoaderInvocation(BaseInvocation):
+    """Apply a LoRA model to a FLUX transformer."""
+
+    lora: ModelIdentifierField = InputField(
+        description=FieldDescriptions.lora_model, title="LoRA", ui_type=UIType.LoRAModel
+    )
+    weight: float = InputField(default=0.75, description=FieldDescriptions.lora_weight)
+    transformer: TransformerField = InputField(
+        description=FieldDescriptions.transformer,
+        input=Input.Connection,
+        title="FLUX Transformer",
+    )
+
+    def invoke(self, context: InvocationContext) -> FluxLoRALoaderOutput:
+        lora_key = self.lora.key
+
+        if not context.models.exists(lora_key):
+            raise ValueError(f"Unknown lora: {lora_key}!")
+
+        if any(lora.lora.key == lora_key for lora in self.transformer.loras):
+            raise Exception(f'LoRA "{lora_key}" already applied to transformer.')
+
+        transformer = self.transformer.model_copy(deep=True)
+        transformer.loras.append(
+            LoRAField(
+                lora=self.lora,
+                weight=self.weight,
+            )
+        )
+
+        return FluxLoRALoaderOutput(transformer=transformer)

invokeai/app/invocations/flux_text_encoder.py

@@ -40,7 +40,10 @@ class FluxTextEncoderInvocation(BaseInvocation):
 
     @torch.no_grad()
     def invoke(self, context: InvocationContext) -> FluxConditioningOutput:
-        t5_embeddings, clip_embeddings = self._encode_prompt(context)
+        # Note: The T5 and CLIP encoding are done in separate functions to ensure that all model references are locally
+        # scoped. This ensures that the T5 model can be freed and gc'd before loading the CLIP model (if necessary).
+        t5_embeddings = self._t5_encode(context)
+        clip_embeddings = self._clip_encode(context)
         conditioning_data = ConditioningFieldData(
             conditionings=[FLUXConditioningInfo(clip_embeds=clip_embeddings, t5_embeds=t5_embeddings)]
         )
@@ -48,12 +51,7 @@ class FluxTextEncoderInvocation(BaseInvocation):
         conditioning_name = context.conditioning.save(conditioning_data)
         return FluxConditioningOutput.build(conditioning_name)
 
-    def _encode_prompt(self, context: InvocationContext) -> tuple[torch.Tensor, torch.Tensor]:
-        # Load CLIP.
-        clip_tokenizer_info = context.models.load(self.clip.tokenizer)
-        clip_text_encoder_info = context.models.load(self.clip.text_encoder)
-
-        # Load T5.
+    def _t5_encode(self, context: InvocationContext) -> torch.Tensor:
         t5_tokenizer_info = context.models.load(self.t5_encoder.tokenizer)
         t5_text_encoder_info = context.models.load(self.t5_encoder.text_encoder)
 
@@ -70,6 +68,15 @@ class FluxTextEncoderInvocation(BaseInvocation):
 
             prompt_embeds = t5_encoder(prompt)
 
+        assert isinstance(prompt_embeds, torch.Tensor)
+        return prompt_embeds
+
+    def _clip_encode(self, context: InvocationContext) -> torch.Tensor:
+        clip_tokenizer_info = context.models.load(self.clip.tokenizer)
+        clip_text_encoder_info = context.models.load(self.clip.text_encoder)
+
+        prompt = [self.prompt]
+
         with (
             clip_text_encoder_info as clip_text_encoder,
             clip_tokenizer_info as clip_tokenizer,
@@ -81,6 +88,5 @@ class FluxTextEncoderInvocation(BaseInvocation):
 
             pooled_prompt_embeds = clip_encoder(prompt)
 
-        assert isinstance(prompt_embeds, torch.Tensor)
         assert isinstance(pooled_prompt_embeds, torch.Tensor)
-        return prompt_embeds, pooled_prompt_embeds
+        return pooled_prompt_embeds

invokeai/app/invocations/flux_text_to_image.py

@@ -1,172 +0,0 @@
-import torch
-from einops import rearrange
-from PIL import Image
-
-from invokeai.app.invocations.baseinvocation import BaseInvocation, Classification, invocation
-from invokeai.app.invocations.fields import (
-    FieldDescriptions,
-    FluxConditioningField,
-    Input,
-    InputField,
-    WithBoard,
-    WithMetadata,
-)
-from invokeai.app.invocations.model import TransformerField, VAEField
-from invokeai.app.invocations.primitives import ImageOutput
-from invokeai.app.services.session_processor.session_processor_common import CanceledException
-from invokeai.app.services.shared.invocation_context import InvocationContext
-from invokeai.backend.flux.model import Flux
-from invokeai.backend.flux.modules.autoencoder import AutoEncoder
-from invokeai.backend.flux.sampling import denoise, get_noise, get_schedule, prepare_latent_img_patches, unpack
-from invokeai.backend.stable_diffusion.diffusion.conditioning_data import FLUXConditioningInfo
-from invokeai.backend.util.devices import TorchDevice
-
-
-@invocation(
-    "flux_text_to_image",
-    title="FLUX Text to Image",
-    tags=["image", "flux"],
-    category="image",
-    version="1.0.0",
-    classification=Classification.Prototype,
-)
-class FluxTextToImageInvocation(BaseInvocation, WithMetadata, WithBoard):
-    """Text-to-image generation using a FLUX model."""
-
-    transformer: TransformerField = InputField(
-        description=FieldDescriptions.flux_model,
-        input=Input.Connection,
-        title="Transformer",
-    )
-    vae: VAEField = InputField(
-        description=FieldDescriptions.vae,
-        input=Input.Connection,
-    )
-    positive_text_conditioning: FluxConditioningField = InputField(
-        description=FieldDescriptions.positive_cond, input=Input.Connection
-    )
-    width: int = InputField(default=1024, multiple_of=16, description="Width of the generated image.")
-    height: int = InputField(default=1024, multiple_of=16, description="Height of the generated image.")
-    num_steps: int = InputField(
-        default=4, description="Number of diffusion steps. Recommend values are schnell: 4, dev: 50."
-    )
-    guidance: float = InputField(
-        default=4.0,
-        description="The guidance strength. Higher values adhere more strictly to the prompt, and will produce less diverse images. FLUX dev only, ignored for schnell.",
-    )
-    seed: int = InputField(default=0, description="Randomness seed for reproducibility.")
-
-    @torch.no_grad()
-    def invoke(self, context: InvocationContext) -> ImageOutput:
-        # Load the conditioning data.
-        cond_data = context.conditioning.load(self.positive_text_conditioning.conditioning_name)
-        assert len(cond_data.conditionings) == 1
-        flux_conditioning = cond_data.conditionings[0]
-        assert isinstance(flux_conditioning, FLUXConditioningInfo)
-
-        latents = self._run_diffusion(context, flux_conditioning.clip_embeds, flux_conditioning.t5_embeds)
-        image = self._run_vae_decoding(context, latents)
-        image_dto = context.images.save(image=image)
-        return ImageOutput.build(image_dto)
-
-    def _run_diffusion(
-        self,
-        context: InvocationContext,
-        clip_embeddings: torch.Tensor,
-        t5_embeddings: torch.Tensor,
-    ):
-        transformer_info = context.models.load(self.transformer.transformer)
-        inference_dtype = torch.bfloat16
-
-        # Prepare input noise.
-        x = get_noise(
-            num_samples=1,
-            height=self.height,
-            width=self.width,
-            device=TorchDevice.choose_torch_device(),
-            dtype=inference_dtype,
-            seed=self.seed,
-        )
-
-        img, img_ids = prepare_latent_img_patches(x)
-
-        is_schnell = "schnell" in transformer_info.config.config_path
-
-        timesteps = get_schedule(
-            num_steps=self.num_steps,
-            image_seq_len=img.shape[1],
-            shift=not is_schnell,
-        )
-
-        bs, t5_seq_len, _ = t5_embeddings.shape
-        txt_ids = torch.zeros(bs, t5_seq_len, 3, dtype=inference_dtype, device=TorchDevice.choose_torch_device())
-
-        # HACK(ryand): Manually empty the cache. Currently we don't check the size of the model before loading it from
-        # disk. Since the transformer model is large (24GB), there's a good chance that it will OOM on 32GB RAM systems
-        # if the cache is not empty.
-        context.models._services.model_manager.load.ram_cache.make_room(24 * 2**30)
-
-        with transformer_info as transformer:
-            assert isinstance(transformer, Flux)
-
-            def step_callback() -> None:
-                if context.util.is_canceled():
-                    raise CanceledException
-
-                # TODO: Make this look like the image before re-enabling
-                # latent_image = unpack(img.float(), self.height, self.width)
-                # latent_image = latent_image.squeeze()  # Remove unnecessary dimensions
-                # flattened_tensor = latent_image.reshape(-1)  # Flatten to shape [48*128*128]
-
-                # # Create a new tensor of the required shape [255, 255, 3]
-                # latent_image = flattened_tensor[: 255 * 255 * 3].reshape(255, 255, 3)  # Reshape to RGB format
-
-                # # Convert to a NumPy array and then to a PIL Image
-                # image = Image.fromarray(latent_image.cpu().numpy().astype(np.uint8))
-
-                # (width, height) = image.size
-                # width *= 8
-                # height *= 8
-
-                # dataURL = image_to_dataURL(image, image_format="JPEG")
-
-                # # TODO: move this whole function to invocation context to properly reference these variables
-                # context._services.events.emit_invocation_denoise_progress(
-                #     context._data.queue_item,
-                #     context._data.invocation,
-                #     state,
-                #     ProgressImage(dataURL=dataURL, width=width, height=height),
-                # )
-
-            x = denoise(
-                model=transformer,
-                img=img,
-                img_ids=img_ids,
-                txt=t5_embeddings,
-                txt_ids=txt_ids,
-                vec=clip_embeddings,
-                timesteps=timesteps,
-                step_callback=step_callback,
-                guidance=self.guidance,
-            )
-
-        x = unpack(x.float(), self.height, self.width)
-
-        return x
-
-    def _run_vae_decoding(
-        self,
-        context: InvocationContext,
-        latents: torch.Tensor,
-    ) -> Image.Image:
-        vae_info = context.models.load(self.vae.vae)
-        with vae_info as vae:
-            assert isinstance(vae, AutoEncoder)
-            latents = latents.to(dtype=TorchDevice.choose_torch_dtype())
-            img = vae.decode(latents)
-
-        img = img.clamp(-1, 1)
-        img = rearrange(img[0], "c h w -> h w c")
-        img_pil = Image.fromarray((127.5 * (img + 1.0)).byte().cpu().numpy())
-
-        return img_pil

invokeai/app/invocations/flux_vae_decode.py

@@ -0,0 +1,60 @@
+import torch
+from einops import rearrange
+from PIL import Image
+
+from invokeai.app.invocations.baseinvocation import BaseInvocation, invocation
+from invokeai.app.invocations.fields import (
+    FieldDescriptions,
+    Input,
+    InputField,
+    LatentsField,
+    WithBoard,
+    WithMetadata,
+)
+from invokeai.app.invocations.model import VAEField
+from invokeai.app.invocations.primitives import ImageOutput
+from invokeai.app.services.shared.invocation_context import InvocationContext
+from invokeai.backend.flux.modules.autoencoder import AutoEncoder
+from invokeai.backend.model_manager.load.load_base import LoadedModel
+from invokeai.backend.util.devices import TorchDevice
+
+
+@invocation(
+    "flux_vae_decode",
+    title="FLUX Latents to Image",
+    tags=["latents", "image", "vae", "l2i", "flux"],
+    category="latents",
+    version="1.0.0",
+)
+class FluxVaeDecodeInvocation(BaseInvocation, WithMetadata, WithBoard):
+    """Generates an image from latents."""
+
+    latents: LatentsField = InputField(
+        description=FieldDescriptions.latents,
+        input=Input.Connection,
+    )
+    vae: VAEField = InputField(
+        description=FieldDescriptions.vae,
+        input=Input.Connection,
+    )
+
+    def _vae_decode(self, vae_info: LoadedModel, latents: torch.Tensor) -> Image.Image:
+        with vae_info as vae:
+            assert isinstance(vae, AutoEncoder)
+            latents = latents.to(device=TorchDevice.choose_torch_device(), dtype=TorchDevice.choose_torch_dtype())
+            img = vae.decode(latents)
+
+        img = img.clamp(-1, 1)
+        img = rearrange(img[0], "c h w -> h w c")  # noqa: F821
+        img_pil = Image.fromarray((127.5 * (img + 1.0)).byte().cpu().numpy())
+        return img_pil
+
+    @torch.no_grad()
+    def invoke(self, context: InvocationContext) -> ImageOutput:
+        latents = context.tensors.load(self.latents.latents_name)
+        vae_info = context.models.load(self.vae.vae)
+        image = self._vae_decode(vae_info=vae_info, latents=latents)
+
+        TorchDevice.empty_cache()
+        image_dto = context.images.save(image=image)
+        return ImageOutput.build(image_dto)

invokeai/app/invocations/flux_vae_encode.py

@@ -0,0 +1,67 @@
+import einops
+import torch
+
+from invokeai.app.invocations.baseinvocation import BaseInvocation, invocation
+from invokeai.app.invocations.fields import (
+    FieldDescriptions,
+    ImageField,
+    Input,
+    InputField,
+)
+from invokeai.app.invocations.model import VAEField
+from invokeai.app.invocations.primitives import LatentsOutput
+from invokeai.app.services.shared.invocation_context import InvocationContext
+from invokeai.backend.flux.modules.autoencoder import AutoEncoder
+from invokeai.backend.model_manager import LoadedModel
+from invokeai.backend.stable_diffusion.diffusers_pipeline import image_resized_to_grid_as_tensor
+from invokeai.backend.util.devices import TorchDevice
+
+
+@invocation(
+    "flux_vae_encode",
+    title="FLUX Image to Latents",
+    tags=["latents", "image", "vae", "i2l", "flux"],
+    category="latents",
+    version="1.0.0",
+)
+class FluxVaeEncodeInvocation(BaseInvocation):
+    """Encodes an image into latents."""
+
+    image: ImageField = InputField(
+        description="The image to encode.",
+    )
+    vae: VAEField = InputField(
+        description=FieldDescriptions.vae,
+        input=Input.Connection,
+    )
+
+    @staticmethod
+    def vae_encode(vae_info: LoadedModel, image_tensor: torch.Tensor) -> torch.Tensor:
+        # TODO(ryand): Expose seed parameter at the invocation level.
+        # TODO(ryand): Write a util function for generating random tensors that is consistent across devices / dtypes.
+        # There's a starting point in get_noise(...), but it needs to be extracted and generalized. This function
+        # should be used for VAE encode sampling.
+        generator = torch.Generator(device=TorchDevice.choose_torch_device()).manual_seed(0)
+        with vae_info as vae:
+            assert isinstance(vae, AutoEncoder)
+            image_tensor = image_tensor.to(
+                device=TorchDevice.choose_torch_device(), dtype=TorchDevice.choose_torch_dtype()
+            )
+            latents = vae.encode(image_tensor, sample=True, generator=generator)
+            return latents
+
+    @torch.no_grad()
+    def invoke(self, context: InvocationContext) -> LatentsOutput:
+        image = context.images.get_pil(self.image.image_name)
+
+        vae_info = context.models.load(self.vae.vae)
+
+        image_tensor = image_resized_to_grid_as_tensor(image.convert("RGB"))
+        if image_tensor.dim() == 3:
+            image_tensor = einops.rearrange(image_tensor, "c h w -> 1 c h w")
+
+        latents = self.vae_encode(vae_info=vae_info, image_tensor=image_tensor)
+
+        latents = latents.to("cpu")
+        name = context.tensors.save(tensor=latents)
+        return LatentsOutput.build(latents_name=name, latents=latents, seed=None)

invokeai/app/invocations/mask.py

@@ -126,7 +126,7 @@ class ImageMaskToTensorInvocation(BaseInvocation, WithMetadata):
     title="Tensor Mask to Image",
     tags=["mask"],
     category="mask",
-    version="1.0.0",
+    version="1.1.0",
 )
 class MaskTensorToImageInvocation(BaseInvocation, WithMetadata, WithBoard):
     """Convert a mask tensor to an image."""
@@ -135,6 +135,11 @@ class MaskTensorToImageInvocation(BaseInvocation, WithMetadata, WithBoard):
 
     def invoke(self, context: InvocationContext) -> ImageOutput:
         mask = context.tensors.load(self.mask.tensor_name)
+
+        # Squeeze the channel dimension if it exists.
+        if mask.dim() == 3:
+            mask = mask.squeeze(0)
+
         # Ensure that the mask is binary.
         if mask.dtype != torch.bool:
             mask = mask > 0.5

invokeai/app/invocations/model.py

@@ -69,6 +69,7 @@ class CLIPField(BaseModel):
 
 class TransformerField(BaseModel):
     transformer: ModelIdentifierField = Field(description="Info to load Transformer submodel")
+    loras: List[LoRAField] = Field(description="LoRAs to apply on model loading")
 
 
 class T5EncoderField(BaseModel):
@@ -157,7 +158,7 @@ class FluxModelLoaderOutput(BaseInvocationOutput):
     title="Flux Main Model",
     tags=["model", "flux"],
     category="model",
-    version="1.0.3",
+    version="1.0.4",
     classification=Classification.Prototype,
 )
 class FluxModelLoaderInvocation(BaseInvocation):
@@ -169,80 +170,46 @@ class FluxModelLoaderInvocation(BaseInvocation):
         input=Input.Direct,
     )
 
-    t5_encoder: ModelIdentifierField = InputField(
-        description=FieldDescriptions.t5_encoder,
-        ui_type=UIType.T5EncoderModel,
+    t5_encoder_model: ModelIdentifierField = InputField(
+        description=FieldDescriptions.t5_encoder, ui_type=UIType.T5EncoderModel, input=Input.Direct, title="T5 Encoder"
+    )
+
+    clip_embed_model: ModelIdentifierField = InputField(
+        description=FieldDescriptions.clip_embed_model,
+        ui_type=UIType.CLIPEmbedModel,
         input=Input.Direct,
+        title="CLIP Embed",
+    )
+
+    vae_model: ModelIdentifierField = InputField(
+        description=FieldDescriptions.vae_model, ui_type=UIType.FluxVAEModel, title="VAE"
     )
 
     def invoke(self, context: InvocationContext) -> FluxModelLoaderOutput:
-        model_key = self.model.key
+        for key in [self.model.key, self.t5_encoder_model.key, self.clip_embed_model.key, self.vae_model.key]:
+            if not context.models.exists(key):
+                raise ValueError(f"Unknown model: {key}")
+
+        transformer = self.model.model_copy(update={"submodel_type": SubModelType.Transformer})
+        vae = self.vae_model.model_copy(update={"submodel_type": SubModelType.VAE})
+
+        tokenizer = self.clip_embed_model.model_copy(update={"submodel_type": SubModelType.Tokenizer})
+        clip_encoder = self.clip_embed_model.model_copy(update={"submodel_type": SubModelType.TextEncoder})
+
+        tokenizer2 = self.t5_encoder_model.model_copy(update={"submodel_type": SubModelType.Tokenizer2})
+        t5_encoder = self.t5_encoder_model.model_copy(update={"submodel_type": SubModelType.TextEncoder2})
 
-        if not context.models.exists(model_key):
-            raise ValueError(f"Unknown model: {model_key}")
-        transformer = self._get_model(context, SubModelType.Transformer)
-        tokenizer = self._get_model(context, SubModelType.Tokenizer)
-        tokenizer2 = self._get_model(context, SubModelType.Tokenizer2)
-        clip_encoder = self._get_model(context, SubModelType.TextEncoder)
-        t5_encoder = self._get_model(context, SubModelType.TextEncoder2)
-        vae = self._get_model(context, SubModelType.VAE)
         transformer_config = context.models.get_config(transformer)
         assert isinstance(transformer_config, CheckpointConfigBase)
 
         return FluxModelLoaderOutput(
-            transformer=TransformerField(transformer=transformer),
+            transformer=TransformerField(transformer=transformer, loras=[]),
             clip=CLIPField(tokenizer=tokenizer, text_encoder=clip_encoder, loras=[], skipped_layers=0),
             t5_encoder=T5EncoderField(tokenizer=tokenizer2, text_encoder=t5_encoder),
             vae=VAEField(vae=vae),
             max_seq_len=max_seq_lengths[transformer_config.config_path],
         )
 
-    def _get_model(self, context: InvocationContext, submodel: SubModelType) -> ModelIdentifierField:
-        match submodel:
-            case SubModelType.Transformer:
-                return self.model.model_copy(update={"submodel_type": SubModelType.Transformer})
-            case SubModelType.VAE:
-                return self._pull_model_from_mm(
-                    context,
-                    SubModelType.VAE,
-                    "FLUX.1-schnell_ae",
-                    ModelType.VAE,
-                    BaseModelType.Flux,
-                )
-            case submodel if submodel in [SubModelType.Tokenizer, SubModelType.TextEncoder]:
-                return self._pull_model_from_mm(
-                    context,
-                    submodel,
-                    "clip-vit-large-patch14",
-                    ModelType.CLIPEmbed,
-                    BaseModelType.Any,
-                )
-            case submodel if submodel in [SubModelType.Tokenizer2, SubModelType.TextEncoder2]:
-                return self._pull_model_from_mm(
-                    context,
-                    submodel,
-                    self.t5_encoder.name,
-                    ModelType.T5Encoder,
-                    BaseModelType.Any,
-                )
-            case _:
-                raise Exception(f"{submodel.value} is not a supported submodule for a flux model")
-
-    def _pull_model_from_mm(
-        self,
-        context: InvocationContext,
-        submodel: SubModelType,
-        name: str,
-        type: ModelType,
-        base: BaseModelType,
-    ):
-        if models := context.models.search_by_attrs(name=name, base=base, type=type):
-            if len(models) != 1:
-                raise Exception(f"Multiple models detected for selected model with name {name}")
-            return ModelIdentifierField.from_config(models[0]).model_copy(update={"submodel_type": submodel})
-        else:
-            raise ValueError(f"Please install the {base}:{type} model named {name} via starter models")
-
 
 @invocation(
     "main_model_loader",

invokeai/app/invocations/tiled_multi_diffusion_denoise_latents.py

@@ -22,8 +22,8 @@ from invokeai.app.invocations.fields import (
 from invokeai.app.invocations.model import UNetField
 from invokeai.app.invocations.primitives import LatentsOutput
 from invokeai.app.services.shared.invocation_context import InvocationContext
-from invokeai.backend.lora import LoRAModelRaw
 from invokeai.backend.model_patcher import ModelPatcher
+from invokeai.backend.peft.lora import LoRAModelRaw
 from invokeai.backend.stable_diffusion.diffusers_pipeline import ControlNetData, PipelineIntermediateState
 from invokeai.backend.stable_diffusion.multi_diffusion_pipeline import (
     MultiDiffusionPipeline,

invokeai/app/services/model_install/model_install_common.py

@@ -103,7 +103,7 @@ class HFModelSource(StringLikeSource):
         if self.variant:
             base += f":{self.variant or ''}"
         if self.subfolder:
-            base += f":{self.subfolder}"
+            base += f"::{self.subfolder.as_posix()}"
         return base
 
 

invokeai/app/services/workflow_records/default_workflows/FLUX Image to Image.json

@@ -0,0 +1,407 @@
+{
+  "name": "FLUX Image to Image",
+  "author": "InvokeAI",
+  "description": "A simple image-to-image workflow using a FLUX dev model. ",
+  "version": "1.0.4",
+  "contact": "",
+  "tags": "image2image, flux, image-to-image",
+  "notes": "Prerequisite model downloads: T5 Encoder, CLIP-L Encoder, and FLUX VAE. Quantized and un-quantized versions can be found in the starter models tab within your Model Manager. We recommend using FLUX dev models for image-to-image workflows. The image-to-image performance with FLUX schnell models is poor.",
+  "exposedFields": [
+    {
+      "nodeId": "f8d9d7c8-9ed7-4bd7-9e42-ab0e89bfac90",
+      "fieldName": "model"
+    },
+    {
+      "nodeId": "f8d9d7c8-9ed7-4bd7-9e42-ab0e89bfac90",
+      "fieldName": "t5_encoder_model"
+    },
+    {
+      "nodeId": "f8d9d7c8-9ed7-4bd7-9e42-ab0e89bfac90",
+      "fieldName": "clip_embed_model"
+    },
+    {
+      "nodeId": "f8d9d7c8-9ed7-4bd7-9e42-ab0e89bfac90",
+      "fieldName": "vae_model"
+    },
+    {
+      "nodeId": "ace0258f-67d7-4eee-a218-6fff27065214",
+      "fieldName": "denoising_start"
+    },
+    {
+      "nodeId": "01f674f8-b3d1-4df1-acac-6cb8e0bfb63c",
+      "fieldName": "prompt"
+    },
+    {
+      "nodeId": "ace0258f-67d7-4eee-a218-6fff27065214",
+      "fieldName": "num_steps"
+    }
+  ],
+  "meta": {
+    "version": "3.0.0",
+    "category": "default"
+  },
+  "nodes": [
+    {
+      "id": "2981a67c-480f-4237-9384-26b68dbf912b",
+      "type": "invocation",
+      "data": {
+        "id": "2981a67c-480f-4237-9384-26b68dbf912b",
+        "type": "flux_vae_encode",
+        "version": "1.0.0",
+        "label": "",
+        "notes": "",
+        "isOpen": true,
+        "isIntermediate": true,
+        "useCache": true,
+        "inputs": {
+          "image": {
+            "name": "image",
+            "label": "",
+            "value": {
+              "image_name": "8a5c62aa-9335-45d2-9c71-89af9fc1f8d4.png"
+            }
+          },
+          "vae": {
+            "name": "vae",
+            "label": ""
+          }
+        }
+      },
+      "position": {
+        "x": 732.7680166609682,
+        "y": -24.37398171806909
+      }
+    },
+    {
+      "id": "ace0258f-67d7-4eee-a218-6fff27065214",
+      "type": "invocation",
+      "data": {
+        "id": "ace0258f-67d7-4eee-a218-6fff27065214",
+        "type": "flux_denoise",
+        "version": "1.0.0",
+        "label": "",
+        "notes": "",
+        "isOpen": true,
+        "isIntermediate": true,
+        "useCache": true,
+        "inputs": {
+          "board": {
+            "name": "board",
+            "label": ""
+          },
+          "metadata": {
+            "name": "metadata",
+            "label": ""
+          },
+          "latents": {
+            "name": "latents",
+            "label": ""
+          },
+          "denoise_mask": {
+            "name": "denoise_mask",
+            "label": ""
+          },
+          "denoising_start": {
+            "name": "denoising_start",
+            "label": "",
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invokeai/app/services/workflow_records/default_workflows/Flux Text to Image.json

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 {
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   "author": "InvokeAI",
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-  "version": "1.0.0",
+  "description": "A simple text-to-image workflow using FLUX dev or schnell models.",
+  "version": "1.0.4",
   "contact": "",
   "tags": "text2image, flux",
   "notes": "Prerequisite model downloads: T5 Encoder, CLIP-L Encoder, and FLUX VAE. Quantized and un-quantized versions can be found in the starter models tab within your Model Manager. We recommend 4 steps for FLUX schnell models and 30 steps for FLUX dev models.",
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+            "value": 1024
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@@ -135,132 +252,75 @@
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+      "target": "4fe24f07-f906-4f55-ab2c-9beee56ef5bd",
+      "sourceHandle": "transformer",
+      "targetHandle": "transformer"
+    },
+    {
+      "id": "reactflow__edge-01f674f8-b3d1-4df1-acac-6cb8e0bfb63cconditioning-4fe24f07-f906-4f55-ab2c-9beee56ef5bdpositive_text_conditioning",
+      "type": "default",
+      "source": "01f674f8-b3d1-4df1-acac-6cb8e0bfb63c",
+      "target": "4fe24f07-f906-4f55-ab2c-9beee56ef5bd",
+      "sourceHandle": "conditioning",
+      "targetHandle": "positive_text_conditioning"
+    },
+    {
+      "id": "reactflow__edge-4754c534-a5f3-4ad0-9382-7887985e668cvalue-4fe24f07-f906-4f55-ab2c-9beee56ef5bdseed",
+      "type": "default",
+      "source": "4754c534-a5f3-4ad0-9382-7887985e668c",
+      "target": "4fe24f07-f906-4f55-ab2c-9beee56ef5bd",
+      "sourceHandle": "value",
+      "targetHandle": "seed"
+    },
+    {
+      "id": "reactflow__edge-4fe24f07-f906-4f55-ab2c-9beee56ef5bdlatents-7e5172eb-48c1-44db-a770-8fd83e1435d1latents",
+      "type": "default",
+      "source": "4fe24f07-f906-4f55-ab2c-9beee56ef5bd",
+      "target": "7e5172eb-48c1-44db-a770-8fd83e1435d1",
+      "sourceHandle": "latents",
+      "targetHandle": "latents"
+    },
+    {
+      "id": "reactflow__edge-f8d9d7c8-9ed7-4bd7-9e42-ab0e89bfac90vae-7e5172eb-48c1-44db-a770-8fd83e1435d1vae",
+      "type": "default",
+      "source": "f8d9d7c8-9ed7-4bd7-9e42-ab0e89bfac90",
+      "target": "7e5172eb-48c1-44db-a770-8fd83e1435d1",
+      "sourceHandle": "vae",
+      "targetHandle": "vae"
+    },
+    {
+      "id": "reactflow__edge-f8d9d7c8-9ed7-4bd7-9e42-ab0e89bfac90max_seq_len-01f674f8-b3d1-4df1-acac-6cb8e0bfb63ct5_max_seq_len",
+      "type": "default",
+      "source": "f8d9d7c8-9ed7-4bd7-9e42-ab0e89bfac90",
       "target": "01f674f8-b3d1-4df1-acac-6cb8e0bfb63c",
       "sourceHandle": "max_seq_len",
       "targetHandle": "t5_max_seq_len"
     },
     {
-      "id": "reactflow__edge-4f0207c2-ff40-41fd-b047-ad33fbb1c33avae-159bdf1b-79e7-4174-b86e-d40e646964c8vae",
+      "id": "reactflow__edge-f8d9d7c8-9ed7-4bd7-9e42-ab0e89bfac90t5_encoder-01f674f8-b3d1-4df1-acac-6cb8e0bfb63ct5_encoder",
       "type": "default",
-      "source": "4f0207c2-ff40-41fd-b047-ad33fbb1c33a",
-      "target": "159bdf1b-79e7-4174-b86e-d40e646964c8",
-      "sourceHandle": "vae",
-      "targetHandle": "vae"
-    },
-    {
-      "id": "reactflow__edge-4f0207c2-ff40-41fd-b047-ad33fbb1c33atransformer-159bdf1b-79e7-4174-b86e-d40e646964c8transformer",
-      "type": "default",
-      "source": "4f0207c2-ff40-41fd-b047-ad33fbb1c33a",
-      "target": "159bdf1b-79e7-4174-b86e-d40e646964c8",
-      "sourceHandle": "transformer",
-      "targetHandle": "transformer"
-    },
-    {
-      "id": "reactflow__edge-4f0207c2-ff40-41fd-b047-ad33fbb1c33at5_encoder-01f674f8-b3d1-4df1-acac-6cb8e0bfb63ct5_encoder",
-      "type": "default",
-      "source": "4f0207c2-ff40-41fd-b047-ad33fbb1c33a",
+      "source": "f8d9d7c8-9ed7-4bd7-9e42-ab0e89bfac90",
       "target": "01f674f8-b3d1-4df1-acac-6cb8e0bfb63c",
       "sourceHandle": "t5_encoder",
       "targetHandle": "t5_encoder"
     },
     {
-      "id": "reactflow__edge-4f0207c2-ff40-41fd-b047-ad33fbb1c33aclip-01f674f8-b3d1-4df1-acac-6cb8e0bfb63cclip",
+      "id": "reactflow__edge-f8d9d7c8-9ed7-4bd7-9e42-ab0e89bfac90clip-01f674f8-b3d1-4df1-acac-6cb8e0bfb63cclip",
       "type": "default",
-      "source": "4f0207c2-ff40-41fd-b047-ad33fbb1c33a",
+      "source": "f8d9d7c8-9ed7-4bd7-9e42-ab0e89bfac90",
       "target": "01f674f8-b3d1-4df1-acac-6cb8e0bfb63c",
       "sourceHandle": "clip",
       "targetHandle": "clip"
-    },
-    {
-      "id": "reactflow__edge-01f674f8-b3d1-4df1-acac-6cb8e0bfb63cconditioning-159bdf1b-79e7-4174-b86e-d40e646964c8positive_text_conditioning",
-      "type": "default",
-      "source": "01f674f8-b3d1-4df1-acac-6cb8e0bfb63c",
-      "target": "159bdf1b-79e7-4174-b86e-d40e646964c8",
-      "sourceHandle": "conditioning",
-      "targetHandle": "positive_text_conditioning"
-    },
-    {
-      "id": "reactflow__edge-4754c534-a5f3-4ad0-9382-7887985e668cvalue-159bdf1b-79e7-4174-b86e-d40e646964c8seed",
-      "type": "default",
-      "source": "4754c534-a5f3-4ad0-9382-7887985e668c",
-      "target": "159bdf1b-79e7-4174-b86e-d40e646964c8",
-      "sourceHandle": "value",
-      "targetHandle": "seed"
     }
   ]
 }

invokeai/backend/flux/denoise.py

@@ -0,0 +1,45 @@
+from typing import Callable
+
+import torch
+from tqdm import tqdm
+
+from invokeai.backend.flux.inpaint_extension import InpaintExtension
+from invokeai.backend.flux.model import Flux
+
+
+def denoise(
+    model: Flux,
+    # model input
+    img: torch.Tensor,
+    img_ids: torch.Tensor,
+    txt: torch.Tensor,
+    txt_ids: torch.Tensor,
+    vec: torch.Tensor,
+    # sampling parameters
+    timesteps: list[float],
+    step_callback: Callable[[], None],
+    guidance: float,
+    inpaint_extension: InpaintExtension | None,
+):
+    # guidance_vec is ignored for schnell.
+    guidance_vec = torch.full((img.shape[0],), guidance, device=img.device, dtype=img.dtype)
+    for t_curr, t_prev in tqdm(list(zip(timesteps[:-1], timesteps[1:], strict=True))):
+        t_vec = torch.full((img.shape[0],), t_curr, dtype=img.dtype, device=img.device)
+        pred = model(
+            img=img,
+            img_ids=img_ids,
+            txt=txt,
+            txt_ids=txt_ids,
+            y=vec,
+            timesteps=t_vec,
+            guidance=guidance_vec,
+        )
+
+        img = img + (t_prev - t_curr) * pred
+
+        if inpaint_extension is not None:
+            img = inpaint_extension.merge_intermediate_latents_with_init_latents(img, t_prev)
+
+        step_callback()
+
+    return img

invokeai/backend/flux/inpaint_extension.py

@@ -0,0 +1,35 @@
+import torch
+
+
+class InpaintExtension:
+    """A class for managing inpainting with FLUX."""
+
+    def __init__(self, init_latents: torch.Tensor, inpaint_mask: torch.Tensor, noise: torch.Tensor):
+        """Initialize InpaintExtension.
+
+        Args:
+            init_latents (torch.Tensor): The initial latents (i.e. un-noised at timestep 0). In 'packed' format.
+            inpaint_mask (torch.Tensor): A mask specifying which elements to inpaint. Range [0, 1]. Values of 1 will be
+                re-generated. Values of 0 will remain unchanged. Values between 0 and 1 can be used to blend the
+                inpainted region with the background. In 'packed' format.
+            noise (torch.Tensor): The noise tensor used to noise the init_latents. In 'packed' format.
+        """
+        assert init_latents.shape == inpaint_mask.shape == noise.shape
+        self._init_latents = init_latents
+        self._inpaint_mask = inpaint_mask
+        self._noise = noise
+
+    def merge_intermediate_latents_with_init_latents(
+        self, intermediate_latents: torch.Tensor, timestep: float
+    ) -> torch.Tensor:
+        """Merge the intermediate latents with the initial latents for the current timestep using the inpaint mask. I.e.
+        update the intermediate latents to keep the regions that are not being inpainted on the correct noise
+        trajectory.
+
+        This function should be called after each denoising step.
+        """
+        # Noise the init latents for the current timestep.
+        noised_init_latents = self._noise * timestep + (1.0 - timestep) * self._init_latents
+
+        # Merge the intermediate latents with the noised_init_latents using the inpaint_mask.
+        return intermediate_latents * self._inpaint_mask + noised_init_latents * (1.0 - self._inpaint_mask)

invokeai/backend/flux/modules/autoencoder.py

@@ -258,16 +258,17 @@ class Decoder(nn.Module):
 
 
 class DiagonalGaussian(nn.Module):
-    def __init__(self, sample: bool = True, chunk_dim: int = 1):
+    def __init__(self, chunk_dim: int = 1):
         super().__init__()
-        self.sample = sample
         self.chunk_dim = chunk_dim
 
-    def forward(self, z: Tensor) -> Tensor:
+    def forward(self, z: Tensor, sample: bool = True, generator: torch.Generator | None = None) -> Tensor:
         mean, logvar = torch.chunk(z, 2, dim=self.chunk_dim)
-        if self.sample:
+        if sample:
             std = torch.exp(0.5 * logvar)
-            return mean + std * torch.randn_like(mean)
+            # Unfortunately, torch.randn_like(...) does not accept a generator argument at the time of writing, so we
+            # have to use torch.randn(...) instead.
+            return mean + std * torch.randn(size=mean.size(), generator=generator, dtype=mean.dtype, device=mean.device)
         else:
             return mean
 
@@ -297,8 +298,21 @@ class AutoEncoder(nn.Module):
         self.scale_factor = params.scale_factor
         self.shift_factor = params.shift_factor
 
-    def encode(self, x: Tensor) -> Tensor:
-        z = self.reg(self.encoder(x))
+    def encode(self, x: Tensor, sample: bool = True, generator: torch.Generator | None = None) -> Tensor:
+        """Run VAE encoding on input tensor x.
+
+        Args:
+            x (Tensor): Input image tensor. Shape: (batch_size, in_channels, height, width).
+            sample (bool, optional): If True, sample from the encoded distribution, else, return the distribution mean.
+                Defaults to True.
+            generator (torch.Generator | None, optional): Optional random number generator for reproducibility.
+                Defaults to None.
+
+        Returns:
+            Tensor: Encoded latent tensor. Shape: (batch_size, z_channels, latent_height, latent_width).
+        """
+
+        z = self.reg(self.encoder(x), sample=sample, generator=generator)
         z = self.scale_factor * (z - self.shift_factor)
         return z
 

invokeai/backend/flux/sampling.py

@@ -1,176 +0,0 @@
-# Initially pulled from https://github.com/black-forest-labs/flux
-
-import math
-from typing import Callable
-
-import torch
-from einops import rearrange, repeat
-from torch import Tensor
-from tqdm import tqdm
-
-from invokeai.backend.flux.model import Flux
-from invokeai.backend.flux.modules.conditioner import HFEncoder
-
-
-def get_noise(
-    num_samples: int,
-    height: int,
-    width: int,
-    device: torch.device,
-    dtype: torch.dtype,
-    seed: int,
-):
-    # We always generate noise on the same device and dtype then cast to ensure consistency across devices/dtypes.
-    rand_device = "cpu"
-    rand_dtype = torch.float16
-    return torch.randn(
-        num_samples,
-        16,
-        # allow for packing
-        2 * math.ceil(height / 16),
-        2 * math.ceil(width / 16),
-        device=rand_device,
-        dtype=rand_dtype,
-        generator=torch.Generator(device=rand_device).manual_seed(seed),
-    ).to(device=device, dtype=dtype)
-
-
-def prepare(t5: HFEncoder, clip: HFEncoder, img: Tensor, prompt: str | list[str]) -> dict[str, Tensor]:
-    bs, c, h, w = img.shape
-    if bs == 1 and not isinstance(prompt, str):
-        bs = len(prompt)
-
-    img = rearrange(img, "b c (h ph) (w pw) -> b (h w) (c ph pw)", ph=2, pw=2)
-    if img.shape[0] == 1 and bs > 1:
-        img = repeat(img, "1 ... -> bs ...", bs=bs)
-
-    img_ids = torch.zeros(h // 2, w // 2, 3)
-    img_ids[..., 1] = img_ids[..., 1] + torch.arange(h // 2)[:, None]
-    img_ids[..., 2] = img_ids[..., 2] + torch.arange(w // 2)[None, :]
-    img_ids = repeat(img_ids, "h w c -> b (h w) c", b=bs)
-
-    if isinstance(prompt, str):
-        prompt = [prompt]
-    txt = t5(prompt)
-    if txt.shape[0] == 1 and bs > 1:
-        txt = repeat(txt, "1 ... -> bs ...", bs=bs)
-    txt_ids = torch.zeros(bs, txt.shape[1], 3)
-
-    vec = clip(prompt)
-    if vec.shape[0] == 1 and bs > 1:
-        vec = repeat(vec, "1 ... -> bs ...", bs=bs)
-
-    return {
-        "img": img,
-        "img_ids": img_ids.to(img.device),
-        "txt": txt.to(img.device),
-        "txt_ids": txt_ids.to(img.device),
-        "vec": vec.to(img.device),
-    }
-
-
-def time_shift(mu: float, sigma: float, t: Tensor):
-    return math.exp(mu) / (math.exp(mu) + (1 / t - 1) ** sigma)
-
-
-def get_lin_function(x1: float = 256, y1: float = 0.5, x2: float = 4096, y2: float = 1.15) -> Callable[[float], float]:
-    m = (y2 - y1) / (x2 - x1)
-    b = y1 - m * x1
-    return lambda x: m * x + b
-
-
-def get_schedule(
-    num_steps: int,
-    image_seq_len: int,
-    base_shift: float = 0.5,
-    max_shift: float = 1.15,
-    shift: bool = True,
-) -> list[float]:
-    # extra step for zero
-    timesteps = torch.linspace(1, 0, num_steps + 1)
-
-    # shifting the schedule to favor high timesteps for higher signal images
-    if shift:
-        # eastimate mu based on linear estimation between two points
-        mu = get_lin_function(y1=base_shift, y2=max_shift)(image_seq_len)
-        timesteps = time_shift(mu, 1.0, timesteps)
-
-    return timesteps.tolist()
-
-
-def denoise(
-    model: Flux,
-    # model input
-    img: Tensor,
-    img_ids: Tensor,
-    txt: Tensor,
-    txt_ids: Tensor,
-    vec: Tensor,
-    # sampling parameters
-    timesteps: list[float],
-    step_callback: Callable[[], None],
-    guidance: float = 4.0,
-):
-    dtype = model.txt_in.bias.dtype
-
-    # TODO(ryand): This shouldn't be necessary if we manage the dtypes properly in the caller.
-    img = img.to(dtype=dtype)
-    img_ids = img_ids.to(dtype=dtype)
-    txt = txt.to(dtype=dtype)
-    txt_ids = txt_ids.to(dtype=dtype)
-    vec = vec.to(dtype=dtype)
-
-    # this is ignored for schnell
-    guidance_vec = torch.full((img.shape[0],), guidance, device=img.device, dtype=img.dtype)
-    for t_curr, t_prev in tqdm(list(zip(timesteps[:-1], timesteps[1:], strict=True))):
-        t_vec = torch.full((img.shape[0],), t_curr, dtype=img.dtype, device=img.device)
-        pred = model(
-            img=img,
-            img_ids=img_ids,
-            txt=txt,
-            txt_ids=txt_ids,
-            y=vec,
-            timesteps=t_vec,
-            guidance=guidance_vec,
-        )
-
-        img = img + (t_prev - t_curr) * pred
-        step_callback()
-
-    return img
-
-
-def unpack(x: Tensor, height: int, width: int) -> Tensor:
-    return rearrange(
-        x,
-        "b (h w) (c ph pw) -> b c (h ph) (w pw)",
-        h=math.ceil(height / 16),
-        w=math.ceil(width / 16),
-        ph=2,
-        pw=2,
-    )
-
-
-def prepare_latent_img_patches(latent_img: torch.Tensor) -> tuple[torch.Tensor, torch.Tensor]:
-    """Convert an input image in latent space to patches for diffusion.
-
-    This implementation was extracted from:
-    https://github.com/black-forest-labs/flux/blob/c00d7c60b085fce8058b9df845e036090873f2ce/src/flux/sampling.py#L32
-
-    Returns:
-        tuple[Tensor, Tensor]: (img, img_ids), as defined in the original flux repo.
-    """
-    bs, c, h, w = latent_img.shape
-
-    # Pixel unshuffle with a scale of 2, and flatten the height/width dimensions to get an array of patches.
-    img = rearrange(latent_img, "b c (h ph) (w pw) -> b (h w) (c ph pw)", ph=2, pw=2)
-    if img.shape[0] == 1 and bs > 1:
-        img = repeat(img, "1 ... -> bs ...", bs=bs)
-
-    # Generate patch position ids.
-    img_ids = torch.zeros(h // 2, w // 2, 3, device=img.device)
-    img_ids[..., 1] = img_ids[..., 1] + torch.arange(h // 2, device=img.device)[:, None]
-    img_ids[..., 2] = img_ids[..., 2] + torch.arange(w // 2, device=img.device)[None, :]
-    img_ids = repeat(img_ids, "h w c -> b (h w) c", b=bs)
-
-    return img, img_ids

invokeai/backend/flux/sampling_utils.py

@@ -0,0 +1,135 @@
+# Initially pulled from https://github.com/black-forest-labs/flux
+
+import math
+from typing import Callable
+
+import torch
+from einops import rearrange, repeat
+
+
+def get_noise(
+    num_samples: int,
+    height: int,
+    width: int,
+    device: torch.device,
+    dtype: torch.dtype,
+    seed: int,
+):
+    # We always generate noise on the same device and dtype then cast to ensure consistency across devices/dtypes.
+    rand_device = "cpu"
+    rand_dtype = torch.float16
+    return torch.randn(
+        num_samples,
+        16,
+        # allow for packing
+        2 * math.ceil(height / 16),
+        2 * math.ceil(width / 16),
+        device=rand_device,
+        dtype=rand_dtype,
+        generator=torch.Generator(device=rand_device).manual_seed(seed),
+    ).to(device=device, dtype=dtype)
+
+
+def time_shift(mu: float, sigma: float, t: torch.Tensor) -> torch.Tensor:
+    return math.exp(mu) / (math.exp(mu) + (1 / t - 1) ** sigma)
+
+
+def get_lin_function(x1: float = 256, y1: float = 0.5, x2: float = 4096, y2: float = 1.15) -> Callable[[float], float]:
+    m = (y2 - y1) / (x2 - x1)
+    b = y1 - m * x1
+    return lambda x: m * x + b
+
+
+def get_schedule(
+    num_steps: int,
+    image_seq_len: int,
+    base_shift: float = 0.5,
+    max_shift: float = 1.15,
+    shift: bool = True,
+) -> list[float]:
+    # extra step for zero
+    timesteps = torch.linspace(1, 0, num_steps + 1)
+
+    # shifting the schedule to favor high timesteps for higher signal images
+    if shift:
+        # estimate mu based on linear estimation between two points
+        mu = get_lin_function(y1=base_shift, y2=max_shift)(image_seq_len)
+        timesteps = time_shift(mu, 1.0, timesteps)
+
+    return timesteps.tolist()
+
+
+def _find_last_index_ge_val(timesteps: list[float], val: float, eps: float = 1e-6) -> int:
+    """Find the last index in timesteps that is >= val.
+
+    We use epsilon-close equality to avoid potential floating point errors.
+    """
+    idx = len(list(filter(lambda t: t >= (val - eps), timesteps))) - 1
+    assert idx >= 0
+    return idx
+
+
+def clip_timestep_schedule(timesteps: list[float], denoising_start: float, denoising_end: float) -> list[float]:
+    """Clip the timestep schedule to the denoising range.
+
+    Args:
+        timesteps (list[float]): The original timestep schedule: [1.0, ..., 0.0].
+        denoising_start (float): A value in [0, 1] specifying the start of the denoising process. E.g. a value of 0.2
+            would mean that the denoising process start at the last timestep in the schedule >= 0.8.
+        denoising_end (float): A value in [0, 1] specifying the end of the denoising process. E.g. a value of 0.8 would
+            mean that the denoising process end at the last timestep in the schedule >= 0.2.
+
+    Returns:
+        list[float]: The clipped timestep schedule.
+    """
+    assert 0.0 <= denoising_start <= 1.0
+    assert 0.0 <= denoising_end <= 1.0
+    assert denoising_start <= denoising_end
+
+    t_start_val = 1.0 - denoising_start
+    t_end_val = 1.0 - denoising_end
+
+    t_start_idx = _find_last_index_ge_val(timesteps, t_start_val)
+    t_end_idx = _find_last_index_ge_val(timesteps, t_end_val)
+
+    clipped_timesteps = timesteps[t_start_idx : t_end_idx + 1]
+
+    return clipped_timesteps
+
+
+def unpack(x: torch.Tensor, height: int, width: int) -> torch.Tensor:
+    """Unpack flat array of patch embeddings to latent image."""
+    return rearrange(
+        x,
+        "b (h w) (c ph pw) -> b c (h ph) (w pw)",
+        h=math.ceil(height / 16),
+        w=math.ceil(width / 16),
+        ph=2,
+        pw=2,
+    )
+
+
+def pack(x: torch.Tensor) -> torch.Tensor:
+    """Pack latent image to flattented array of patch embeddings."""
+    # Pixel unshuffle with a scale of 2, and flatten the height/width dimensions to get an array of patches.
+    return rearrange(x, "b c (h ph) (w pw) -> b (h w) (c ph pw)", ph=2, pw=2)
+
+
+def generate_img_ids(h: int, w: int, batch_size: int, device: torch.device, dtype: torch.dtype) -> torch.Tensor:
+    """Generate tensor of image position ids.
+
+    Args:
+        h (int): Height of image in latent space.
+        w (int): Width of image in latent space.
+        batch_size (int): Batch size.
+        device (torch.device): Device.
+        dtype (torch.dtype): dtype.
+
+    Returns:
+        torch.Tensor: Image position ids.
+    """
+    img_ids = torch.zeros(h // 2, w // 2, 3, device=device, dtype=dtype)
+    img_ids[..., 1] = img_ids[..., 1] + torch.arange(h // 2, device=device, dtype=dtype)[:, None]
+    img_ids[..., 2] = img_ids[..., 2] + torch.arange(w // 2, device=device, dtype=dtype)[None, :]
+    img_ids = repeat(img_ids, "h w c -> b (h w) c", b=batch_size)
+    return img_ids

invokeai/backend/lora.py

@@ -1,672 +0,0 @@
-# Copyright (c) 2024 The InvokeAI Development team
-"""LoRA model support."""
-
-import bisect
-from pathlib import Path
-from typing import Dict, List, Optional, Set, Tuple, Union
-
-import torch
-from safetensors.torch import load_file
-from typing_extensions import Self
-
-import invokeai.backend.util.logging as logger
-from invokeai.backend.model_manager import BaseModelType
-from invokeai.backend.raw_model import RawModel
-
-
-class LoRALayerBase:
-    # rank: Optional[int]
-    # alpha: Optional[float]
-    # bias: Optional[torch.Tensor]
-    # layer_key: str
-
-    # @property
-    # def scale(self):
-    #    return self.alpha / self.rank if (self.alpha and self.rank) else 1.0
-
-    def __init__(
-        self,
-        layer_key: str,
-        values: Dict[str, torch.Tensor],
-    ):
-        if "alpha" in values:
-            self.alpha = values["alpha"].item()
-        else:
-            self.alpha = None
-
-        if "bias_indices" in values and "bias_values" in values and "bias_size" in values:
-            self.bias: Optional[torch.Tensor] = torch.sparse_coo_tensor(
-                values["bias_indices"],
-                values["bias_values"],
-                tuple(values["bias_size"]),
-            )
-
-        else:
-            self.bias = None
-
-        self.rank = None  # set in layer implementation
-        self.layer_key = layer_key
-
-    def get_weight(self, orig_weight: torch.Tensor) -> torch.Tensor:
-        raise NotImplementedError()
-
-    def get_bias(self, orig_bias: torch.Tensor) -> Optional[torch.Tensor]:
-        return self.bias
-
-    def get_parameters(self, orig_module: torch.nn.Module) -> Dict[str, torch.Tensor]:
-        params = {"weight": self.get_weight(orig_module.weight)}
-        bias = self.get_bias(orig_module.bias)
-        if bias is not None:
-            params["bias"] = bias
-        return params
-
-    def calc_size(self) -> int:
-        model_size = 0
-        for val in [self.bias]:
-            if val is not None:
-                model_size += val.nelement() * val.element_size()
-        return model_size
-
-    def to(self, device: Optional[torch.device] = None, dtype: Optional[torch.dtype] = None) -> None:
-        if self.bias is not None:
-            self.bias = self.bias.to(device=device, dtype=dtype)
-
-    def check_keys(self, values: Dict[str, torch.Tensor], known_keys: Set[str]):
-        """Log a warning if values contains unhandled keys."""
-        # {"alpha", "bias_indices", "bias_values", "bias_size"} are hard-coded, because they are handled by
-        # `LoRALayerBase`. Sub-classes should provide the known_keys that they handled.
-        all_known_keys = known_keys | {"alpha", "bias_indices", "bias_values", "bias_size"}
-        unknown_keys = set(values.keys()) - all_known_keys
-        if unknown_keys:
-            logger.warning(
-                f"Unexpected keys found in LoRA/LyCORIS layer, model might work incorrectly! Keys: {unknown_keys}"
-            )
-
-
-# TODO: find and debug lora/locon with bias
-class LoRALayer(LoRALayerBase):
-    # up: torch.Tensor
-    # mid: Optional[torch.Tensor]
-    # down: torch.Tensor
-
-    def __init__(
-        self,
-        layer_key: str,
-        values: Dict[str, torch.Tensor],
-    ):
-        super().__init__(layer_key, values)
-
-        self.up = values["lora_up.weight"]
-        self.down = values["lora_down.weight"]
-        self.mid = values.get("lora_mid.weight", None)
-
-        self.rank = self.down.shape[0]
-        self.check_keys(
-            values,
-            {
-                "lora_up.weight",
-                "lora_down.weight",
-                "lora_mid.weight",
-            },
-        )
-
-    def get_weight(self, orig_weight: torch.Tensor) -> torch.Tensor:
-        if self.mid is not None:
-            up = self.up.reshape(self.up.shape[0], self.up.shape[1])
-            down = self.down.reshape(self.down.shape[0], self.down.shape[1])
-            weight = torch.einsum("m n w h, i m, n j -> i j w h", self.mid, up, down)
-        else:
-            weight = self.up.reshape(self.up.shape[0], -1) @ self.down.reshape(self.down.shape[0], -1)
-
-        return weight
-
-    def calc_size(self) -> int:
-        model_size = super().calc_size()
-        for val in [self.up, self.mid, self.down]:
-            if val is not None:
-                model_size += val.nelement() * val.element_size()
-        return model_size
-
-    def to(self, device: Optional[torch.device] = None, dtype: Optional[torch.dtype] = None) -> None:
-        super().to(device=device, dtype=dtype)
-
-        self.up = self.up.to(device=device, dtype=dtype)
-        self.down = self.down.to(device=device, dtype=dtype)
-
-        if self.mid is not None:
-            self.mid = self.mid.to(device=device, dtype=dtype)
-
-
-class LoHALayer(LoRALayerBase):
-    # w1_a: torch.Tensor
-    # w1_b: torch.Tensor
-    # w2_a: torch.Tensor
-    # w2_b: torch.Tensor
-    # t1: Optional[torch.Tensor] = None
-    # t2: Optional[torch.Tensor] = None
-
-    def __init__(self, layer_key: str, values: Dict[str, torch.Tensor]):
-        super().__init__(layer_key, values)
-
-        self.w1_a = values["hada_w1_a"]
-        self.w1_b = values["hada_w1_b"]
-        self.w2_a = values["hada_w2_a"]
-        self.w2_b = values["hada_w2_b"]
-        self.t1 = values.get("hada_t1", None)
-        self.t2 = values.get("hada_t2", None)
-
-        self.rank = self.w1_b.shape[0]
-        self.check_keys(
-            values,
-            {
-                "hada_w1_a",
-                "hada_w1_b",
-                "hada_w2_a",
-                "hada_w2_b",
-                "hada_t1",
-                "hada_t2",
-            },
-        )
-
-    def get_weight(self, orig_weight: torch.Tensor) -> torch.Tensor:
-        if self.t1 is None:
-            weight: torch.Tensor = (self.w1_a @ self.w1_b) * (self.w2_a @ self.w2_b)
-
-        else:
-            rebuild1 = torch.einsum("i j k l, j r, i p -> p r k l", self.t1, self.w1_b, self.w1_a)
-            rebuild2 = torch.einsum("i j k l, j r, i p -> p r k l", self.t2, self.w2_b, self.w2_a)
-            weight = rebuild1 * rebuild2
-
-        return weight
-
-    def calc_size(self) -> int:
-        model_size = super().calc_size()
-        for val in [self.w1_a, self.w1_b, self.w2_a, self.w2_b, self.t1, self.t2]:
-            if val is not None:
-                model_size += val.nelement() * val.element_size()
-        return model_size
-
-    def to(self, device: Optional[torch.device] = None, dtype: Optional[torch.dtype] = None) -> None:
-        super().to(device=device, dtype=dtype)
-
-        self.w1_a = self.w1_a.to(device=device, dtype=dtype)
-        self.w1_b = self.w1_b.to(device=device, dtype=dtype)
-        if self.t1 is not None:
-            self.t1 = self.t1.to(device=device, dtype=dtype)
-
-        self.w2_a = self.w2_a.to(device=device, dtype=dtype)
-        self.w2_b = self.w2_b.to(device=device, dtype=dtype)
-        if self.t2 is not None:
-            self.t2 = self.t2.to(device=device, dtype=dtype)
-
-
-class LoKRLayer(LoRALayerBase):
-    # w1: Optional[torch.Tensor] = None
-    # w1_a: Optional[torch.Tensor] = None
-    # w1_b: Optional[torch.Tensor] = None
-    # w2: Optional[torch.Tensor] = None
-    # w2_a: Optional[torch.Tensor] = None
-    # w2_b: Optional[torch.Tensor] = None
-    # t2: Optional[torch.Tensor] = None
-
-    def __init__(
-        self,
-        layer_key: str,
-        values: Dict[str, torch.Tensor],
-    ):
-        super().__init__(layer_key, values)
-
-        self.w1 = values.get("lokr_w1", None)
-        if self.w1 is None:
-            self.w1_a = values["lokr_w1_a"]
-            self.w1_b = values["lokr_w1_b"]
-        else:
-            self.w1_b = None
-            self.w1_a = None
-
-        self.w2 = values.get("lokr_w2", None)
-        if self.w2 is None:
-            self.w2_a = values["lokr_w2_a"]
-            self.w2_b = values["lokr_w2_b"]
-        else:
-            self.w2_a = None
-            self.w2_b = None
-
-        self.t2 = values.get("lokr_t2", None)
-
-        if self.w1_b is not None:
-            self.rank = self.w1_b.shape[0]
-        elif self.w2_b is not None:
-            self.rank = self.w2_b.shape[0]
-        else:
-            self.rank = None  # unscaled
-
-        self.check_keys(
-            values,
-            {
-                "lokr_w1",
-                "lokr_w1_a",
-                "lokr_w1_b",
-                "lokr_w2",
-                "lokr_w2_a",
-                "lokr_w2_b",
-                "lokr_t2",
-            },
-        )
-
-    def get_weight(self, orig_weight: torch.Tensor) -> torch.Tensor:
-        w1: Optional[torch.Tensor] = self.w1
-        if w1 is None:
-            assert self.w1_a is not None
-            assert self.w1_b is not None
-            w1 = self.w1_a @ self.w1_b
-
-        w2 = self.w2
-        if w2 is None:
-            if self.t2 is None:
-                assert self.w2_a is not None
-                assert self.w2_b is not None
-                w2 = self.w2_a @ self.w2_b
-            else:
-                w2 = torch.einsum("i j k l, i p, j r -> p r k l", self.t2, self.w2_a, self.w2_b)
-
-        if len(w2.shape) == 4:
-            w1 = w1.unsqueeze(2).unsqueeze(2)
-        w2 = w2.contiguous()
-        assert w1 is not None
-        assert w2 is not None
-        weight = torch.kron(w1, w2)
-
-        return weight
-
-    def calc_size(self) -> int:
-        model_size = super().calc_size()
-        for val in [self.w1, self.w1_a, self.w1_b, self.w2, self.w2_a, self.w2_b, self.t2]:
-            if val is not None:
-                model_size += val.nelement() * val.element_size()
-        return model_size
-
-    def to(self, device: Optional[torch.device] = None, dtype: Optional[torch.dtype] = None) -> None:
-        super().to(device=device, dtype=dtype)
-
-        if self.w1 is not None:
-            self.w1 = self.w1.to(device=device, dtype=dtype)
-        else:
-            assert self.w1_a is not None
-            assert self.w1_b is not None
-            self.w1_a = self.w1_a.to(device=device, dtype=dtype)
-            self.w1_b = self.w1_b.to(device=device, dtype=dtype)
-
-        if self.w2 is not None:
-            self.w2 = self.w2.to(device=device, dtype=dtype)
-        else:
-            assert self.w2_a is not None
-            assert self.w2_b is not None
-            self.w2_a = self.w2_a.to(device=device, dtype=dtype)
-            self.w2_b = self.w2_b.to(device=device, dtype=dtype)
-
-        if self.t2 is not None:
-            self.t2 = self.t2.to(device=device, dtype=dtype)
-
-
-class FullLayer(LoRALayerBase):
-    # bias handled in LoRALayerBase(calc_size, to)
-    # weight: torch.Tensor
-    # bias: Optional[torch.Tensor]
-
-    def __init__(
-        self,
-        layer_key: str,
-        values: Dict[str, torch.Tensor],
-    ):
-        super().__init__(layer_key, values)
-
-        self.weight = values["diff"]
-        self.bias = values.get("diff_b", None)
-
-        self.rank = None  # unscaled
-        self.check_keys(values, {"diff", "diff_b"})
-
-    def get_weight(self, orig_weight: torch.Tensor) -> torch.Tensor:
-        return self.weight
-
-    def calc_size(self) -> int:
-        model_size = super().calc_size()
-        model_size += self.weight.nelement() * self.weight.element_size()
-        return model_size
-
-    def to(self, device: Optional[torch.device] = None, dtype: Optional[torch.dtype] = None) -> None:
-        super().to(device=device, dtype=dtype)
-
-        self.weight = self.weight.to(device=device, dtype=dtype)
-
-
-class IA3Layer(LoRALayerBase):
-    # weight: torch.Tensor
-    # on_input: torch.Tensor
-
-    def __init__(
-        self,
-        layer_key: str,
-        values: Dict[str, torch.Tensor],
-    ):
-        super().__init__(layer_key, values)
-
-        self.weight = values["weight"]
-        self.on_input = values["on_input"]
-
-        self.rank = None  # unscaled
-        self.check_keys(values, {"weight", "on_input"})
-
-    def get_weight(self, orig_weight: torch.Tensor) -> torch.Tensor:
-        weight = self.weight
-        if not self.on_input:
-            weight = weight.reshape(-1, 1)
-        assert orig_weight is not None
-        return orig_weight * weight
-
-    def calc_size(self) -> int:
-        model_size = super().calc_size()
-        model_size += self.weight.nelement() * self.weight.element_size()
-        model_size += self.on_input.nelement() * self.on_input.element_size()
-        return model_size
-
-    def to(self, device: Optional[torch.device] = None, dtype: Optional[torch.dtype] = None):
-        super().to(device=device, dtype=dtype)
-
-        self.weight = self.weight.to(device=device, dtype=dtype)
-        self.on_input = self.on_input.to(device=device, dtype=dtype)
-
-
-class NormLayer(LoRALayerBase):
-    # bias handled in LoRALayerBase(calc_size, to)
-    # weight: torch.Tensor
-    # bias: Optional[torch.Tensor]
-
-    def __init__(
-        self,
-        layer_key: str,
-        values: Dict[str, torch.Tensor],
-    ):
-        super().__init__(layer_key, values)
-
-        self.weight = values["w_norm"]
-        self.bias = values.get("b_norm", None)
-
-        self.rank = None  # unscaled
-        self.check_keys(values, {"w_norm", "b_norm"})
-
-    def get_weight(self, orig_weight: torch.Tensor) -> torch.Tensor:
-        return self.weight
-
-    def calc_size(self) -> int:
-        model_size = super().calc_size()
-        model_size += self.weight.nelement() * self.weight.element_size()
-        return model_size
-
-    def to(self, device: Optional[torch.device] = None, dtype: Optional[torch.dtype] = None) -> None:
-        super().to(device=device, dtype=dtype)
-
-        self.weight = self.weight.to(device=device, dtype=dtype)
-
-
-AnyLoRALayer = Union[LoRALayer, LoHALayer, LoKRLayer, FullLayer, IA3Layer, NormLayer]
-
-
-class LoRAModelRaw(RawModel):  # (torch.nn.Module):
-    _name: str
-    layers: Dict[str, AnyLoRALayer]
-
-    def __init__(
-        self,
-        name: str,
-        layers: Dict[str, AnyLoRALayer],
-    ):
-        self._name = name
-        self.layers = layers
-
-    @property
-    def name(self) -> str:
-        return self._name
-
-    def to(self, device: Optional[torch.device] = None, dtype: Optional[torch.dtype] = None) -> None:
-        # TODO: try revert if exception?
-        for _key, layer in self.layers.items():
-            layer.to(device=device, dtype=dtype)
-
-    def calc_size(self) -> int:
-        model_size = 0
-        for _, layer in self.layers.items():
-            model_size += layer.calc_size()
-        return model_size
-
-    @classmethod
-    def _convert_sdxl_keys_to_diffusers_format(cls, state_dict: Dict[str, torch.Tensor]) -> Dict[str, torch.Tensor]:
-        """Convert the keys of an SDXL LoRA state_dict to diffusers format.
-
-        The input state_dict can be in either Stability AI format or diffusers format. If the state_dict is already in
-        diffusers format, then this function will have no effect.
-
-        This function is adapted from:
-        https://github.com/bmaltais/kohya_ss/blob/2accb1305979ba62f5077a23aabac23b4c37e935/networks/lora_diffusers.py#L385-L409
-
-        Args:
-            state_dict (Dict[str, Tensor]): The SDXL LoRA state_dict.
-
-        Raises:
-            ValueError: If state_dict contains an unrecognized key, or not all keys could be converted.
-
-        Returns:
-            Dict[str, Tensor]: The diffusers-format state_dict.
-        """
-        converted_count = 0  # The number of Stability AI keys converted to diffusers format.
-        not_converted_count = 0  # The number of keys that were not converted.
-
-        # Get a sorted list of Stability AI UNet keys so that we can efficiently search for keys with matching prefixes.
-        # For example, we want to efficiently find `input_blocks_4_1` in the list when searching for
-        # `input_blocks_4_1_proj_in`.
-        stability_unet_keys = list(SDXL_UNET_STABILITY_TO_DIFFUSERS_MAP)
-        stability_unet_keys.sort()
-
-        new_state_dict = {}
-        for full_key, value in state_dict.items():
-            if full_key.startswith("lora_unet_"):
-                search_key = full_key.replace("lora_unet_", "")
-                # Use bisect to find the key in stability_unet_keys that *may* match the search_key's prefix.
-                position = bisect.bisect_right(stability_unet_keys, search_key)
-                map_key = stability_unet_keys[position - 1]
-                # Now, check if the map_key *actually* matches the search_key.
-                if search_key.startswith(map_key):
-                    new_key = full_key.replace(map_key, SDXL_UNET_STABILITY_TO_DIFFUSERS_MAP[map_key])
-                    new_state_dict[new_key] = value
-                    converted_count += 1
-                else:
-                    new_state_dict[full_key] = value
-                    not_converted_count += 1
-            elif full_key.startswith("lora_te1_") or full_key.startswith("lora_te2_"):
-                # The CLIP text encoders have the same keys in both Stability AI and diffusers formats.
-                new_state_dict[full_key] = value
-                continue
-            else:
-                raise ValueError(f"Unrecognized SDXL LoRA key prefix: '{full_key}'.")
-
-        if converted_count > 0 and not_converted_count > 0:
-            raise ValueError(
-                f"The SDXL LoRA could only be partially converted to diffusers format. converted={converted_count},"
-                f" not_converted={not_converted_count}"
-            )
-
-        return new_state_dict
-
-    @classmethod
-    def from_checkpoint(
-        cls,
-        file_path: Union[str, Path],
-        device: Optional[torch.device] = None,
-        dtype: Optional[torch.dtype] = None,
-        base_model: Optional[BaseModelType] = None,
-    ) -> Self:
-        device = device or torch.device("cpu")
-        dtype = dtype or torch.float32
-
-        if isinstance(file_path, str):
-            file_path = Path(file_path)
-
-        model = cls(
-            name=file_path.stem,
-            layers={},
-        )
-
-        if file_path.suffix == ".safetensors":
-            sd = load_file(file_path.absolute().as_posix(), device="cpu")
-        else:
-            sd = torch.load(file_path, map_location="cpu")
-
-        state_dict = cls._group_state(sd)
-
-        if base_model == BaseModelType.StableDiffusionXL:
-            state_dict = cls._convert_sdxl_keys_to_diffusers_format(state_dict)
-
-        for layer_key, values in state_dict.items():
-            # Detect layers according to LyCORIS detection logic(`weight_list_det`)
-            # https://github.com/KohakuBlueleaf/LyCORIS/tree/8ad8000efb79e2b879054da8c9356e6143591bad/lycoris/modules
-
-            # lora and locon
-            if "lora_up.weight" in values:
-                layer: AnyLoRALayer = LoRALayer(layer_key, values)
-
-            # loha
-            elif "hada_w1_a" in values:
-                layer = LoHALayer(layer_key, values)
-
-            # lokr
-            elif "lokr_w1" in values or "lokr_w1_a" in values:
-                layer = LoKRLayer(layer_key, values)
-
-            # diff
-            elif "diff" in values:
-                layer = FullLayer(layer_key, values)
-
-            # ia3
-            elif "on_input" in values:
-                layer = IA3Layer(layer_key, values)
-
-            # norms
-            elif "w_norm" in values:
-                layer = NormLayer(layer_key, values)
-
-            else:
-                print(f">> Encountered unknown lora layer module in {model.name}: {layer_key} - {list(values.keys())}")
-                raise Exception("Unknown lora format!")
-
-            # lower memory consumption by removing already parsed layer values
-            state_dict[layer_key].clear()
-
-            layer.to(device=device, dtype=dtype)
-            model.layers[layer_key] = layer
-
-        return model
-
-    @staticmethod
-    def _group_state(state_dict: Dict[str, torch.Tensor]) -> Dict[str, Dict[str, torch.Tensor]]:
-        state_dict_groupped: Dict[str, Dict[str, torch.Tensor]] = {}
-
-        for key, value in state_dict.items():
-            stem, leaf = key.split(".", 1)
-            if stem not in state_dict_groupped:
-                state_dict_groupped[stem] = {}
-            state_dict_groupped[stem][leaf] = value
-
-        return state_dict_groupped
-
-
-# code from
-# https://github.com/bmaltais/kohya_ss/blob/2accb1305979ba62f5077a23aabac23b4c37e935/networks/lora_diffusers.py#L15C1-L97C32
-def make_sdxl_unet_conversion_map() -> List[Tuple[str, str]]:
-    """Create a dict mapping state_dict keys from Stability AI SDXL format to diffusers SDXL format."""
-    unet_conversion_map_layer = []
-
-    for i in range(3):  # num_blocks is 3 in sdxl
-        # loop over downblocks/upblocks
-        for j in range(2):
-            # loop over resnets/attentions for downblocks
-            hf_down_res_prefix = f"down_blocks.{i}.resnets.{j}."
-            sd_down_res_prefix = f"input_blocks.{3*i + j + 1}.0."
-            unet_conversion_map_layer.append((sd_down_res_prefix, hf_down_res_prefix))
-
-            if i < 3:
-                # no attention layers in down_blocks.3
-                hf_down_atn_prefix = f"down_blocks.{i}.attentions.{j}."
-                sd_down_atn_prefix = f"input_blocks.{3*i + j + 1}.1."
-                unet_conversion_map_layer.append((sd_down_atn_prefix, hf_down_atn_prefix))
-
-        for j in range(3):
-            # loop over resnets/attentions for upblocks
-            hf_up_res_prefix = f"up_blocks.{i}.resnets.{j}."
-            sd_up_res_prefix = f"output_blocks.{3*i + j}.0."
-            unet_conversion_map_layer.append((sd_up_res_prefix, hf_up_res_prefix))
-
-            # if i > 0: commentout for sdxl
-            # no attention layers in up_blocks.0
-            hf_up_atn_prefix = f"up_blocks.{i}.attentions.{j}."
-            sd_up_atn_prefix = f"output_blocks.{3*i + j}.1."
-            unet_conversion_map_layer.append((sd_up_atn_prefix, hf_up_atn_prefix))
-
-        if i < 3:
-            # no downsample in down_blocks.3
-            hf_downsample_prefix = f"down_blocks.{i}.downsamplers.0.conv."
-            sd_downsample_prefix = f"input_blocks.{3*(i+1)}.0.op."
-            unet_conversion_map_layer.append((sd_downsample_prefix, hf_downsample_prefix))
-
-            # no upsample in up_blocks.3
-            hf_upsample_prefix = f"up_blocks.{i}.upsamplers.0."
-            sd_upsample_prefix = f"output_blocks.{3*i + 2}.{2}."  # change for sdxl
-            unet_conversion_map_layer.append((sd_upsample_prefix, hf_upsample_prefix))
-
-    hf_mid_atn_prefix = "mid_block.attentions.0."
-    sd_mid_atn_prefix = "middle_block.1."
-    unet_conversion_map_layer.append((sd_mid_atn_prefix, hf_mid_atn_prefix))
-
-    for j in range(2):
-        hf_mid_res_prefix = f"mid_block.resnets.{j}."
-        sd_mid_res_prefix = f"middle_block.{2*j}."
-        unet_conversion_map_layer.append((sd_mid_res_prefix, hf_mid_res_prefix))
-
-    unet_conversion_map_resnet = [
-        # (stable-diffusion, HF Diffusers)
-        ("in_layers.0.", "norm1."),
-        ("in_layers.2.", "conv1."),
-        ("out_layers.0.", "norm2."),
-        ("out_layers.3.", "conv2."),
-        ("emb_layers.1.", "time_emb_proj."),
-        ("skip_connection.", "conv_shortcut."),
-    ]
-
-    unet_conversion_map = []
-    for sd, hf in unet_conversion_map_layer:
-        if "resnets" in hf:
-            for sd_res, hf_res in unet_conversion_map_resnet:
-                unet_conversion_map.append((sd + sd_res, hf + hf_res))
-        else:
-            unet_conversion_map.append((sd, hf))
-
-    for j in range(2):
-        hf_time_embed_prefix = f"time_embedding.linear_{j+1}."
-        sd_time_embed_prefix = f"time_embed.{j*2}."
-        unet_conversion_map.append((sd_time_embed_prefix, hf_time_embed_prefix))
-
-    for j in range(2):
-        hf_label_embed_prefix = f"add_embedding.linear_{j+1}."
-        sd_label_embed_prefix = f"label_emb.0.{j*2}."
-        unet_conversion_map.append((sd_label_embed_prefix, hf_label_embed_prefix))
-
-    unet_conversion_map.append(("input_blocks.0.0.", "conv_in."))
-    unet_conversion_map.append(("out.0.", "conv_norm_out."))
-    unet_conversion_map.append(("out.2.", "conv_out."))
-
-    return unet_conversion_map
-
-
-SDXL_UNET_STABILITY_TO_DIFFUSERS_MAP = {
-    sd.rstrip(".").replace(".", "_"): hf.rstrip(".").replace(".", "_") for sd, hf in make_sdxl_unet_conversion_map()
-}

invokeai/backend/model_manager/load/load_default.py

@@ -66,12 +66,14 @@ class ModelLoader(ModelLoaderBase):
         return (model_base / config.path).resolve()
 
     def _load_and_cache(self, config: AnyModelConfig, submodel_type: Optional[SubModelType] = None) -> ModelLockerBase:
+        stats_name = ":".join([config.base, config.type, config.name, (submodel_type or "")])
         try:
-            return self._ram_cache.get(config.key, submodel_type)
+            return self._ram_cache.get(config.key, submodel_type, stats_name=stats_name)
         except IndexError:
             pass
 
         config.path = str(self._get_model_path(config))
+        self._ram_cache.make_room(self.get_size_fs(config, Path(config.path), submodel_type))
         loaded_model = self._load_model(config, submodel_type)
 
         self._ram_cache.put(
@@ -83,7 +85,7 @@ class ModelLoader(ModelLoaderBase):
         return self._ram_cache.get(
             key=config.key,
             submodel_type=submodel_type,
-            stats_name=":".join([config.base, config.type, config.name, (submodel_type or "")]),
+            stats_name=stats_name,
         )
 
     def get_size_fs(

invokeai/backend/model_manager/load/model_cache/model_cache_base.py

@@ -128,7 +128,24 @@ class ModelCacheBase(ABC, Generic[T]):
     @property
     @abstractmethod
     def max_cache_size(self) -> float:
-        """Return true if the cache is configured to lazily offload models in VRAM."""
+        """Return the maximum size the RAM cache can grow to."""
+        pass
+
+    @max_cache_size.setter
+    @abstractmethod
+    def max_cache_size(self, value: float) -> None:
+        """Set the cap on vram cache size."""
+
+    @property
+    @abstractmethod
+    def max_vram_cache_size(self) -> float:
+        """Return the maximum size the VRAM cache can grow to."""
+        pass
+
+    @max_vram_cache_size.setter
+    @abstractmethod
+    def max_vram_cache_size(self, value: float) -> float:
+        """Set the maximum size the VRAM cache can grow to."""
         pass
 
     @abstractmethod
@@ -193,15 +210,6 @@ class ModelCacheBase(ABC, Generic[T]):
         """
         pass
 
-    @abstractmethod
-    def exists(
-        self,
-        key: str,
-        submodel_type: Optional[SubModelType] = None,
-    ) -> bool:
-        """Return true if the model identified by key and submodel_type is in the cache."""
-        pass
-
     @abstractmethod
     def cache_size(self) -> int:
         """Get the total size of the models currently cached."""

invokeai/backend/model_manager/load/model_cache/model_cache_default.py

@@ -1,22 +1,6 @@
 # Copyright (c) 2024 Lincoln D. Stein and the InvokeAI Development team
 # TODO: Add Stalker's proper name to copyright
-"""
-Manage a RAM cache of diffusion/transformer models for fast switching.
-They are moved between GPU VRAM and CPU RAM as necessary. If the cache
-grows larger than a preset maximum, then the least recently used
-model will be cleared and (re)loaded from disk when next needed.
-
-The cache returns context manager generators designed to load the
-model into the GPU within the context, and unload outside the
-context. Use like this:
-
-   cache = ModelCache(max_cache_size=7.5)
-   with cache.get_model('runwayml/stable-diffusion-1-5') as SD1,
-          cache.get_model('stabilityai/stable-diffusion-2') as SD2:
-       do_something_in_GPU(SD1,SD2)
-
-
-"""
+""" """
 
 import gc
 import math
@@ -40,53 +24,74 @@ from invokeai.backend.model_manager.load.model_util import calc_model_size_by_da
 from invokeai.backend.util.devices import TorchDevice
 from invokeai.backend.util.logging import InvokeAILogger
 
-# Maximum size of the cache, in gigs
-# Default is roughly enough to hold three fp16 diffusers models in RAM simultaneously
-DEFAULT_MAX_CACHE_SIZE = 6.0
-
-# amount of GPU memory to hold in reserve for use by generations (GB)
-DEFAULT_MAX_VRAM_CACHE_SIZE = 2.75
-
-# actual size of a gig
-GIG = 1073741824
+# Size of a GB in bytes.
+GB = 2**30
 
 # Size of a MB in bytes.
 MB = 2**20
 
 
 class ModelCache(ModelCacheBase[AnyModel]):
-    """Implementation of ModelCacheBase."""
+    """A cache for managing models in memory.
+
+    The cache is based on two levels of model storage:
+    - execution_device: The device where most models are executed (typically "cuda", "mps", or "cpu").
+    - storage_device: The device where models are offloaded when not in active use (typically "cpu").
+
+    The model cache is based on the following assumptions:
+    - storage_device_mem_size > execution_device_mem_size
+    - disk_to_storage_device_transfer_time >> storage_device_to_execution_device_transfer_time
+
+    A copy of all models in the cache is always kept on the storage_device. A subset of the models also have a copy on
+    the execution_device.
+
+    Models are moved between the storage_device and the execution_device as necessary. Cache size limits are enforced
+    on both the storage_device and the execution_device. The execution_device cache uses a smallest-first offload
+    policy. The storage_device cache uses a least-recently-used (LRU) offload policy.
+
+    Note: Neither of these offload policies has really been compared against alternatives. It's likely that different
+    policies would be better, although the optimal policies are likely heavily dependent on usage patterns and HW
+    configuration.
+
+    The cache returns context manager generators designed to load the model into the execution device (often GPU) within
+    the context, and unload outside the context.
+
+    Example usage:
+    ```
+    cache = ModelCache(max_cache_size=7.5, max_vram_cache_size=6.0)
+    with cache.get_model('runwayml/stable-diffusion-1-5') as SD1:
+        do_something_on_gpu(SD1)
+    ```
+    """
 
     def __init__(
         self,
-        max_cache_size: float = DEFAULT_MAX_CACHE_SIZE,
-        max_vram_cache_size: float = DEFAULT_MAX_VRAM_CACHE_SIZE,
+        max_cache_size: float,
+        max_vram_cache_size: float,
         execution_device: torch.device = torch.device("cuda"),
         storage_device: torch.device = torch.device("cpu"),
         precision: torch.dtype = torch.float16,
-        sequential_offload: bool = False,
         lazy_offloading: bool = True,
-        sha_chunksize: int = 16777216,
         log_memory_usage: bool = False,
         logger: Optional[Logger] = None,
     ):
         """
         Initialize the model RAM cache.
 
-        :param max_cache_size: Maximum size of the RAM cache [6.0 GB]
+        :param max_cache_size: Maximum size of the storage_device cache in GBs.
+        :param max_vram_cache_size: Maximum size of the execution_device cache in GBs.
         :param execution_device: Torch device to load active model into [torch.device('cuda')]
         :param storage_device: Torch device to save inactive model in [torch.device('cpu')]
         :param precision: Precision for loaded models [torch.float16]
         :param lazy_offloading: Keep model in VRAM until another model needs to be loaded
-        :param sequential_offload: Conserve VRAM by loading and unloading each stage of the pipeline sequentially
         :param log_memory_usage: If True, a memory snapshot will be captured before and after every model cache
             operation, and the result will be logged (at debug level). There is a time cost to capturing the memory
             snapshots, so it is recommended to disable this feature unless you are actively inspecting the model cache's
             behaviour.
+        :param logger: InvokeAILogger to use (otherwise creates one)
         """
         # allow lazy offloading only when vram cache enabled
         self._lazy_offloading = lazy_offloading and max_vram_cache_size > 0
-        self._precision: torch.dtype = precision
         self._max_cache_size: float = max_cache_size
         self._max_vram_cache_size: float = max_vram_cache_size
         self._execution_device: torch.device = execution_device
@@ -128,6 +133,16 @@ class ModelCache(ModelCacheBase[AnyModel]):
         """Set the cap on cache size."""
         self._max_cache_size = value
 
+    @property
+    def max_vram_cache_size(self) -> float:
+        """Return the cap on vram cache size."""
+        return self._max_vram_cache_size
+
+    @max_vram_cache_size.setter
+    def max_vram_cache_size(self, value: float) -> None:
+        """Set the cap on vram cache size."""
+        self._max_vram_cache_size = value
+
     @property
     def stats(self) -> Optional[CacheStats]:
         """Return collected CacheStats object."""
@@ -145,15 +160,6 @@ class ModelCache(ModelCacheBase[AnyModel]):
             total += cache_record.size
         return total
 
-    def exists(
-        self,
-        key: str,
-        submodel_type: Optional[SubModelType] = None,
-    ) -> bool:
-        """Return true if the model identified by key and submodel_type is in the cache."""
-        key = self._make_cache_key(key, submodel_type)
-        return key in self._cached_models
-
     def put(
         self,
         key: str,
@@ -203,7 +209,7 @@ class ModelCache(ModelCacheBase[AnyModel]):
         # more stats
         if self.stats:
             stats_name = stats_name or key
-            self.stats.cache_size = int(self._max_cache_size * GIG)
+            self.stats.cache_size = int(self._max_cache_size * GB)
             self.stats.high_watermark = max(self.stats.high_watermark, self.cache_size())
             self.stats.in_cache = len(self._cached_models)
             self.stats.loaded_model_sizes[stats_name] = max(
@@ -231,10 +237,13 @@ class ModelCache(ModelCacheBase[AnyModel]):
             return model_key
 
     def offload_unlocked_models(self, size_required: int) -> None:
-        """Move any unused models from VRAM."""
-        reserved = self._max_vram_cache_size * GIG
+        """Offload models from the execution_device to make room for size_required.
+
+        :param size_required: The amount of space to clear in the execution_device cache, in bytes.
+        """
+        reserved = self._max_vram_cache_size * GB
         vram_in_use = torch.cuda.memory_allocated() + size_required
-        self.logger.debug(f"{(vram_in_use/GIG):.2f}GB VRAM needed for models; max allowed={(reserved/GIG):.2f}GB")
+        self.logger.debug(f"{(vram_in_use/GB):.2f}GB VRAM needed for models; max allowed={(reserved/GB):.2f}GB")
         for _, cache_entry in sorted(self._cached_models.items(), key=lambda x: x[1].size):
             if vram_in_use <= reserved:
                 break
@@ -245,7 +254,7 @@ class ModelCache(ModelCacheBase[AnyModel]):
                 cache_entry.loaded = False
                 vram_in_use = torch.cuda.memory_allocated() + size_required
                 self.logger.debug(
-                    f"Removing {cache_entry.key} from VRAM to free {(cache_entry.size/GIG):.2f}GB; vram free = {(torch.cuda.memory_allocated()/GIG):.2f}GB"
+                    f"Removing {cache_entry.key} from VRAM to free {(cache_entry.size/GB):.2f}GB; vram free = {(torch.cuda.memory_allocated()/GB):.2f}GB"
                 )
 
         TorchDevice.empty_cache()
@@ -303,7 +312,7 @@ class ModelCache(ModelCacheBase[AnyModel]):
         self.logger.debug(
             f"Moved model '{cache_entry.key}' from {source_device} to"
             f" {target_device} in {(end_model_to_time-start_model_to_time):.2f}s."
-            f"Estimated model size: {(cache_entry.size/GIG):.3f} GB."
+            f"Estimated model size: {(cache_entry.size/GB):.3f} GB."
             f"{get_pretty_snapshot_diff(snapshot_before, snapshot_after)}"
         )
 
@@ -326,14 +335,14 @@ class ModelCache(ModelCacheBase[AnyModel]):
                     f"Moving model '{cache_entry.key}' from {source_device} to"
                     f" {target_device} caused an unexpected change in VRAM usage. The model's"
                     " estimated size may be incorrect. Estimated model size:"
-                    f" {(cache_entry.size/GIG):.3f} GB.\n"
+                    f" {(cache_entry.size/GB):.3f} GB.\n"
                     f"{get_pretty_snapshot_diff(snapshot_before, snapshot_after)}"
                 )
 
     def print_cuda_stats(self) -> None:
         """Log CUDA diagnostics."""
-        vram = "%4.2fG" % (torch.cuda.memory_allocated() / GIG)
-        ram = "%4.2fG" % (self.cache_size() / GIG)
+        vram = "%4.2fG" % (torch.cuda.memory_allocated() / GB)
+        ram = "%4.2fG" % (self.cache_size() / GB)
 
         in_ram_models = 0
         in_vram_models = 0
@@ -353,17 +362,20 @@ class ModelCache(ModelCacheBase[AnyModel]):
                 )
 
     def make_room(self, size: int) -> None:
-        """Make enough room in the cache to accommodate a new model of indicated size."""
-        # calculate how much memory this model will require
-        # multiplier = 2 if self.precision==torch.float32 else 1
+        """Make enough room in the cache to accommodate a new model of indicated size.
+
+        Note: This function deletes all of the cache's internal references to a model in order to free it. If there are
+        external references to the model, there's nothing that the cache can do about it, and those models will not be
+        garbage-collected.
+        """
         bytes_needed = size
-        maximum_size = self.max_cache_size * GIG  # stored in GB, convert to bytes
+        maximum_size = self.max_cache_size * GB  # stored in GB, convert to bytes
         current_size = self.cache_size()
 
         if current_size + bytes_needed > maximum_size:
             self.logger.debug(
-                f"Max cache size exceeded: {(current_size/GIG):.2f}/{self.max_cache_size:.2f} GB, need an additional"
-                f" {(bytes_needed/GIG):.2f} GB"
+                f"Max cache size exceeded: {(current_size/GB):.2f}/{self.max_cache_size:.2f} GB, need an additional"
+                f" {(bytes_needed/GB):.2f} GB"
             )
 
         self.logger.debug(f"Before making_room: cached_models={len(self._cached_models)}")
@@ -380,7 +392,7 @@ class ModelCache(ModelCacheBase[AnyModel]):
 
             if not cache_entry.locked:
                 self.logger.debug(
-                    f"Removing {model_key} from RAM cache to free at least {(size/GIG):.2f} GB (-{(cache_entry.size/GIG):.2f} GB)"
+                    f"Removing {model_key} from RAM cache to free at least {(size/GB):.2f} GB (-{(cache_entry.size/GB):.2f} GB)"
                 )
                 current_size -= cache_entry.size
                 models_cleared += 1

invokeai/backend/model_manager/load/model_loaders/lora.py

@@ -5,8 +5,10 @@ from logging import Logger
 from pathlib import Path
 from typing import Optional
 
+import torch
+from safetensors.torch import load_file
+
 from invokeai.app.services.config import InvokeAIAppConfig
-from invokeai.backend.lora import LoRAModelRaw
 from invokeai.backend.model_manager import (
     AnyModel,
     AnyModelConfig,
@@ -18,6 +20,11 @@ from invokeai.backend.model_manager import (
 from invokeai.backend.model_manager.load.load_default import ModelLoader
 from invokeai.backend.model_manager.load.model_cache.model_cache_base import ModelCacheBase
 from invokeai.backend.model_manager.load.model_loader_registry import ModelLoaderRegistry
+from invokeai.backend.peft.conversions.flux_kohya_lora_conversion_utils import (
+    lora_model_from_flux_kohya_state_dict,
+)
+from invokeai.backend.peft.conversions.sd_lora_conversion_utils import lora_model_from_sd_state_dict
+from invokeai.backend.peft.conversions.sdxl_lora_conversion_utils import convert_sdxl_keys_to_diffusers_format
 
 
 @ModelLoaderRegistry.register(base=BaseModelType.Any, type=ModelType.LoRA, format=ModelFormat.Diffusers)
@@ -45,14 +52,28 @@ class LoRALoader(ModelLoader):
             raise ValueError("There are no submodels in a LoRA model.")
         model_path = Path(config.path)
         assert self._model_base is not None
-        model = LoRAModelRaw.from_checkpoint(
-            file_path=model_path,
-            dtype=self._torch_dtype,
-            base_model=self._model_base,
-        )
+
+        # Load the state dict from the model file.
+        if model_path.suffix == ".safetensors":
+            state_dict = load_file(model_path.absolute().as_posix(), device="cpu")
+        else:
+            state_dict = torch.load(model_path, map_location="cpu")
+
+        # Apply state_dict key conversions, if necessary.
+        if self._model_base == BaseModelType.StableDiffusionXL:
+            state_dict = convert_sdxl_keys_to_diffusers_format(state_dict)
+            model = lora_model_from_sd_state_dict(state_dict=state_dict)
+        elif self._model_base == BaseModelType.Flux:
+            model = lora_model_from_flux_kohya_state_dict(state_dict=state_dict)
+        elif self._model_base in [BaseModelType.StableDiffusion1, BaseModelType.StableDiffusion2]:
+            # Currently, we don't apply any conversions for SD1 and SD2 LoRA models.
+            model = lora_model_from_sd_state_dict(state_dict=state_dict)
+        else:
+            raise ValueError(f"Unsupported LoRA base model: {self._model_base}")
+
+        model.to(dtype=self._torch_dtype)
         return model
 
-    # override
     def _get_model_path(self, config: AnyModelConfig) -> Path:
         # cheating a little - we remember this variable for using in the subsequent call to _load_model()
         self._model_base = config.base

invokeai/backend/model_manager/load/model_util.py

@@ -15,9 +15,9 @@ from invokeai.backend.image_util.depth_anything.depth_anything_pipeline import D
 from invokeai.backend.image_util.grounding_dino.grounding_dino_pipeline import GroundingDinoPipeline
 from invokeai.backend.image_util.segment_anything.segment_anything_pipeline import SegmentAnythingPipeline
 from invokeai.backend.ip_adapter.ip_adapter import IPAdapter
-from invokeai.backend.lora import LoRAModelRaw
 from invokeai.backend.model_manager.config import AnyModel
 from invokeai.backend.onnx.onnx_runtime import IAIOnnxRuntimeModel
+from invokeai.backend.peft.lora import LoRAModelRaw
 from invokeai.backend.spandrel_image_to_image_model import SpandrelImageToImageModel
 from invokeai.backend.textual_inversion import TextualInversionModelRaw
 

invokeai/backend/model_manager/probe.py

@@ -26,6 +26,7 @@ from invokeai.backend.model_manager.config import (
     SchedulerPredictionType,
 )
 from invokeai.backend.model_manager.util.model_util import lora_token_vector_length, read_checkpoint_meta
+from invokeai.backend.peft.conversions.flux_kohya_lora_conversion_utils import is_state_dict_likely_in_flux_kohya_format
 from invokeai.backend.spandrel_image_to_image_model import SpandrelImageToImageModel
 from invokeai.backend.util.silence_warnings import SilenceWarnings
 
@@ -528,9 +529,11 @@ class LoRACheckpointProbe(CheckpointProbeBase):
         return ModelFormat("lycoris")
 
     def get_base_type(self) -> BaseModelType:
-        checkpoint = self.checkpoint
-        token_vector_length = lora_token_vector_length(checkpoint)
+        if is_state_dict_likely_in_flux_kohya_format(self.checkpoint):
+            return BaseModelType.Flux
 
+        # If we've gotten here, we assume that the model is a Stable Diffusion model.
+        token_vector_length = lora_token_vector_length(self.checkpoint)
         if token_vector_length == 768:
             return BaseModelType.StableDiffusion1
         elif token_vector_length == 1024:

invokeai/backend/model_patcher.py

@@ -13,10 +13,10 @@ from diffusers import OnnxRuntimeModel, UNet2DConditionModel
 from transformers import CLIPTextModel, CLIPTextModelWithProjection, CLIPTokenizer
 
 from invokeai.app.shared.models import FreeUConfig
-from invokeai.backend.lora import LoRAModelRaw
 from invokeai.backend.model_manager import AnyModel
 from invokeai.backend.model_manager.load.optimizations import skip_torch_weight_init
 from invokeai.backend.onnx.onnx_runtime import IAIOnnxRuntimeModel
+from invokeai.backend.peft.lora import LoRAModelRaw
 from invokeai.backend.stable_diffusion.extensions.lora import LoRAExt
 from invokeai.backend.textual_inversion import TextualInversionManager, TextualInversionModelRaw
 from invokeai.backend.util.original_weights_storage import OriginalWeightsStorage

invokeai/backend/peft/conversions/flux_kohya_lora_conversion_utils.py

@@ -0,0 +1,84 @@
+import re
+from typing import Any, Dict, TypeVar
+
+import torch
+
+from invokeai.backend.peft.layers.any_lora_layer import AnyLoRALayer
+from invokeai.backend.peft.layers.utils import peft_layer_from_state_dict
+from invokeai.backend.peft.lora import LoRAModelRaw
+
+# A regex pattern that matches all of the keys in the Kohya FLUX LoRA format.
+# Example keys:
+#   lora_unet_double_blocks_0_img_attn_proj.alpha
+#   lora_unet_double_blocks_0_img_attn_proj.lora_down.weight
+#   lora_unet_double_blocks_0_img_attn_proj.lora_up.weight
+FLUX_KOHYA_KEY_REGEX = (
+    r"lora_unet_(\w+_blocks)_(\d+)_(img_attn|img_mlp|img_mod|txt_attn|txt_mlp|txt_mod|linear1|linear2|modulation)_?(.*)"
+)
+
+
+def is_state_dict_likely_in_flux_kohya_format(state_dict: Dict[str, Any]) -> bool:
+    """Checks if the provided state dict is likely in the Kohya FLUX LoRA format.
+
+    This is intended to be a high-precision detector, but it is not guaranteed to have perfect precision. (A
+    perfect-precision detector would require checking all keys against a whitelist and verifying tensor shapes.)
+    """
+    for k in state_dict.keys():
+        if not re.match(FLUX_KOHYA_KEY_REGEX, k):
+            return False
+    return True
+
+
+def lora_model_from_flux_kohya_state_dict(state_dict: Dict[str, torch.Tensor]) -> LoRAModelRaw:
+    # Group keys by layer.
+    grouped_state_dict: dict[str, dict[str, torch.Tensor]] = {}
+    for key, value in state_dict.items():
+        layer_name, param_name = key.split(".", 1)
+        if layer_name not in grouped_state_dict:
+            grouped_state_dict[layer_name] = {}
+        grouped_state_dict[layer_name][param_name] = value
+
+    # Convert the state dict to the InvokeAI format.
+    grouped_state_dict = convert_flux_kohya_state_dict_to_invoke_format(grouped_state_dict)
+
+    # Create LoRA layers.
+    layers: dict[str, AnyLoRALayer] = {}
+    for layer_key, layer_state_dict in grouped_state_dict.items():
+        layer = peft_layer_from_state_dict(layer_key, layer_state_dict)
+        layers[layer_key] = layer
+
+    # Create and return the LoRAModelRaw.
+    return LoRAModelRaw(layers=layers)
+
+
+T = TypeVar("T")
+
+
+def convert_flux_kohya_state_dict_to_invoke_format(state_dict: Dict[str, T]) -> Dict[str, T]:
+    """Converts a state dict from the Kohya FLUX LoRA format to LoRA weight format used internally by InvokeAI.
+
+    Example key conversions:
+    "lora_unet_double_blocks_0_img_attn_proj" -> "double_blocks.0.img_attn.proj"
+    "lora_unet_double_blocks_0_img_attn_proj" -> "double_blocks.0.img_attn.proj"
+    "lora_unet_double_blocks_0_img_attn_proj" -> "double_blocks.0.img_attn.proj"
+    "lora_unet_double_blocks_0_img_attn_qkv" -> "double_blocks.0.img_attn.qkv"
+    "lora_unet_double_blocks_0_img_attn_qkv" -> "double_blocks.0.img.attn.qkv"
+    "lora_unet_double_blocks_0_img_attn_qkv" -> "double_blocks.0.img.attn.qkv"
+    """
+
+    def replace_func(match: re.Match[str]) -> str:
+        s = f"{match.group(1)}.{match.group(2)}.{match.group(3)}"
+        if match.group(4):
+            s += f".{match.group(4)}"
+        return s
+
+    converted_dict: dict[str, T] = {}
+    for k, v in state_dict.items():
+        match = re.match(FLUX_KOHYA_KEY_REGEX, k)
+        if match:
+            new_key = re.sub(FLUX_KOHYA_KEY_REGEX, replace_func, k)
+            converted_dict[new_key] = v
+        else:
+            raise ValueError(f"Key '{k}' does not match the expected pattern for FLUX LoRA weights.")
+
+    return converted_dict

invokeai/backend/peft/conversions/sd_lora_conversion_utils.py

@@ -0,0 +1,30 @@
+from typing import Dict
+
+import torch
+
+from invokeai.backend.peft.layers.any_lora_layer import AnyLoRALayer
+from invokeai.backend.peft.layers.utils import peft_layer_from_state_dict
+from invokeai.backend.peft.lora import LoRAModelRaw
+
+
+def lora_model_from_sd_state_dict(state_dict: Dict[str, torch.Tensor]) -> LoRAModelRaw:
+    grouped_state_dict: dict[str, dict[str, torch.Tensor]] = _group_state(state_dict)
+
+    layers: dict[str, AnyLoRALayer] = {}
+    for layer_key, values in grouped_state_dict.items():
+        layer = peft_layer_from_state_dict(layer_key, values)
+        layers[layer_key] = layer
+
+    return LoRAModelRaw(layers=layers)
+
+
+def _group_state(state_dict: Dict[str, torch.Tensor]) -> Dict[str, Dict[str, torch.Tensor]]:
+    state_dict_groupped: Dict[str, Dict[str, torch.Tensor]] = {}
+
+    for key, value in state_dict.items():
+        stem, leaf = key.split(".", 1)
+        if stem not in state_dict_groupped:
+            state_dict_groupped[stem] = {}
+        state_dict_groupped[stem][leaf] = value
+
+    return state_dict_groupped

invokeai/backend/peft/conversions/sdxl_lora_conversion_utils.py

@@ -0,0 +1,154 @@
+import bisect
+from typing import Dict, List, Tuple, TypeVar
+
+T = TypeVar("T")
+
+
+def convert_sdxl_keys_to_diffusers_format(state_dict: Dict[str, T]) -> dict[str, T]:
+    """Convert the keys of an SDXL LoRA state_dict to diffusers format.
+
+    The input state_dict can be in either Stability AI format or diffusers format. If the state_dict is already in
+    diffusers format, then this function will have no effect.
+
+    This function is adapted from:
+    https://github.com/bmaltais/kohya_ss/blob/2accb1305979ba62f5077a23aabac23b4c37e935/networks/lora_diffusers.py#L385-L409
+
+    Args:
+        state_dict (Dict[str, Tensor]): The SDXL LoRA state_dict.
+
+    Raises:
+        ValueError: If state_dict contains an unrecognized key, or not all keys could be converted.
+
+    Returns:
+        Dict[str, Tensor]: The diffusers-format state_dict.
+    """
+    converted_count = 0  # The number of Stability AI keys converted to diffusers format.
+    not_converted_count = 0  # The number of keys that were not converted.
+
+    # Get a sorted list of Stability AI UNet keys so that we can efficiently search for keys with matching prefixes.
+    # For example, we want to efficiently find `input_blocks_4_1` in the list when searching for
+    # `input_blocks_4_1_proj_in`.
+    stability_unet_keys = list(SDXL_UNET_STABILITY_TO_DIFFUSERS_MAP)
+    stability_unet_keys.sort()
+
+    new_state_dict: dict[str, T] = {}
+    for full_key, value in state_dict.items():
+        if full_key.startswith("lora_unet_"):
+            search_key = full_key.replace("lora_unet_", "")
+            # Use bisect to find the key in stability_unet_keys that *may* match the search_key's prefix.
+            position = bisect.bisect_right(stability_unet_keys, search_key)
+            map_key = stability_unet_keys[position - 1]
+            # Now, check if the map_key *actually* matches the search_key.
+            if search_key.startswith(map_key):
+                new_key = full_key.replace(map_key, SDXL_UNET_STABILITY_TO_DIFFUSERS_MAP[map_key])
+                new_state_dict[new_key] = value
+                converted_count += 1
+            else:
+                new_state_dict[full_key] = value
+                not_converted_count += 1
+        elif full_key.startswith("lora_te1_") or full_key.startswith("lora_te2_"):
+            # The CLIP text encoders have the same keys in both Stability AI and diffusers formats.
+            new_state_dict[full_key] = value
+            continue
+        else:
+            raise ValueError(f"Unrecognized SDXL LoRA key prefix: '{full_key}'.")
+
+    if converted_count > 0 and not_converted_count > 0:
+        raise ValueError(
+            f"The SDXL LoRA could only be partially converted to diffusers format. converted={converted_count},"
+            f" not_converted={not_converted_count}"
+        )
+
+    return new_state_dict
+
+
+# code from
+# https://github.com/bmaltais/kohya_ss/blob/2accb1305979ba62f5077a23aabac23b4c37e935/networks/lora_diffusers.py#L15C1-L97C32
+def _make_sdxl_unet_conversion_map() -> List[Tuple[str, str]]:
+    """Create a dict mapping state_dict keys from Stability AI SDXL format to diffusers SDXL format."""
+    unet_conversion_map_layer: list[tuple[str, str]] = []
+
+    for i in range(3):  # num_blocks is 3 in sdxl
+        # loop over downblocks/upblocks
+        for j in range(2):
+            # loop over resnets/attentions for downblocks
+            hf_down_res_prefix = f"down_blocks.{i}.resnets.{j}."
+            sd_down_res_prefix = f"input_blocks.{3*i + j + 1}.0."
+            unet_conversion_map_layer.append((sd_down_res_prefix, hf_down_res_prefix))
+
+            if i < 3:
+                # no attention layers in down_blocks.3
+                hf_down_atn_prefix = f"down_blocks.{i}.attentions.{j}."
+                sd_down_atn_prefix = f"input_blocks.{3*i + j + 1}.1."
+                unet_conversion_map_layer.append((sd_down_atn_prefix, hf_down_atn_prefix))
+
+        for j in range(3):
+            # loop over resnets/attentions for upblocks
+            hf_up_res_prefix = f"up_blocks.{i}.resnets.{j}."
+            sd_up_res_prefix = f"output_blocks.{3*i + j}.0."
+            unet_conversion_map_layer.append((sd_up_res_prefix, hf_up_res_prefix))
+
+            # if i > 0: commentout for sdxl
+            # no attention layers in up_blocks.0
+            hf_up_atn_prefix = f"up_blocks.{i}.attentions.{j}."
+            sd_up_atn_prefix = f"output_blocks.{3*i + j}.1."
+            unet_conversion_map_layer.append((sd_up_atn_prefix, hf_up_atn_prefix))
+
+        if i < 3:
+            # no downsample in down_blocks.3
+            hf_downsample_prefix = f"down_blocks.{i}.downsamplers.0.conv."
+            sd_downsample_prefix = f"input_blocks.{3*(i+1)}.0.op."
+            unet_conversion_map_layer.append((sd_downsample_prefix, hf_downsample_prefix))
+
+            # no upsample in up_blocks.3
+            hf_upsample_prefix = f"up_blocks.{i}.upsamplers.0."
+            sd_upsample_prefix = f"output_blocks.{3*i + 2}.{2}."  # change for sdxl
+            unet_conversion_map_layer.append((sd_upsample_prefix, hf_upsample_prefix))
+
+    hf_mid_atn_prefix = "mid_block.attentions.0."
+    sd_mid_atn_prefix = "middle_block.1."
+    unet_conversion_map_layer.append((sd_mid_atn_prefix, hf_mid_atn_prefix))
+
+    for j in range(2):
+        hf_mid_res_prefix = f"mid_block.resnets.{j}."
+        sd_mid_res_prefix = f"middle_block.{2*j}."
+        unet_conversion_map_layer.append((sd_mid_res_prefix, hf_mid_res_prefix))
+
+    unet_conversion_map_resnet = [
+        # (stable-diffusion, HF Diffusers)
+        ("in_layers.0.", "norm1."),
+        ("in_layers.2.", "conv1."),
+        ("out_layers.0.", "norm2."),
+        ("out_layers.3.", "conv2."),
+        ("emb_layers.1.", "time_emb_proj."),
+        ("skip_connection.", "conv_shortcut."),
+    ]
+
+    unet_conversion_map: list[tuple[str, str]] = []
+    for sd, hf in unet_conversion_map_layer:
+        if "resnets" in hf:
+            for sd_res, hf_res in unet_conversion_map_resnet:
+                unet_conversion_map.append((sd + sd_res, hf + hf_res))
+        else:
+            unet_conversion_map.append((sd, hf))
+
+    for j in range(2):
+        hf_time_embed_prefix = f"time_embedding.linear_{j+1}."
+        sd_time_embed_prefix = f"time_embed.{j*2}."
+        unet_conversion_map.append((sd_time_embed_prefix, hf_time_embed_prefix))
+
+    for j in range(2):
+        hf_label_embed_prefix = f"add_embedding.linear_{j+1}."
+        sd_label_embed_prefix = f"label_emb.0.{j*2}."
+        unet_conversion_map.append((sd_label_embed_prefix, hf_label_embed_prefix))
+
+    unet_conversion_map.append(("input_blocks.0.0.", "conv_in."))
+    unet_conversion_map.append(("out.0.", "conv_norm_out."))
+    unet_conversion_map.append(("out.2.", "conv_out."))
+
+    return unet_conversion_map
+
+
+SDXL_UNET_STABILITY_TO_DIFFUSERS_MAP = {
+    sd.rstrip(".").replace(".", "_"): hf.rstrip(".").replace(".", "_") for sd, hf in _make_sdxl_unet_conversion_map()
+}

invokeai/backend/peft/layers/any_lora_layer.py

@@ -0,0 +1,10 @@
+from typing import Union
+
+from invokeai.backend.peft.layers.full_layer import FullLayer
+from invokeai.backend.peft.layers.ia3_layer import IA3Layer
+from invokeai.backend.peft.layers.loha_layer import LoHALayer
+from invokeai.backend.peft.layers.lokr_layer import LoKRLayer
+from invokeai.backend.peft.layers.lora_layer import LoRALayer
+from invokeai.backend.peft.layers.norm_layer import NormLayer
+
+AnyLoRALayer = Union[LoRALayer, LoHALayer, LoKRLayer, FullLayer, IA3Layer, NormLayer]

invokeai/backend/peft/layers/full_layer.py

@@ -0,0 +1,37 @@
+from typing import Dict, Optional
+
+import torch
+
+from invokeai.backend.peft.layers.lora_layer_base import LoRALayerBase
+
+
+class FullLayer(LoRALayerBase):
+    # bias handled in LoRALayerBase(calc_size, to)
+    # weight: torch.Tensor
+    # bias: Optional[torch.Tensor]
+
+    def __init__(
+        self,
+        layer_key: str,
+        values: Dict[str, torch.Tensor],
+    ):
+        super().__init__(layer_key, values)
+
+        self.weight = values["diff"]
+        self.bias = values.get("diff_b", None)
+
+        self.rank = None  # unscaled
+        self.check_keys(values, {"diff", "diff_b"})
+
+    def get_weight(self, orig_weight: torch.Tensor) -> torch.Tensor:
+        return self.weight
+
+    def calc_size(self) -> int:
+        model_size = super().calc_size()
+        model_size += self.weight.nelement() * self.weight.element_size()
+        return model_size
+
+    def to(self, device: Optional[torch.device] = None, dtype: Optional[torch.dtype] = None) -> None:
+        super().to(device=device, dtype=dtype)
+
+        self.weight = self.weight.to(device=device, dtype=dtype)

invokeai/backend/peft/layers/ia3_layer.py

@@ -0,0 +1,42 @@
+from typing import Dict, Optional
+
+import torch
+
+from invokeai.backend.peft.layers.lora_layer_base import LoRALayerBase
+
+
+class IA3Layer(LoRALayerBase):
+    # weight: torch.Tensor
+    # on_input: torch.Tensor
+
+    def __init__(
+        self,
+        layer_key: str,
+        values: Dict[str, torch.Tensor],
+    ):
+        super().__init__(layer_key, values)
+
+        self.weight = values["weight"]
+        self.on_input = values["on_input"]
+
+        self.rank = None  # unscaled
+        self.check_keys(values, {"weight", "on_input"})
+
+    def get_weight(self, orig_weight: torch.Tensor) -> torch.Tensor:
+        weight = self.weight
+        if not self.on_input:
+            weight = weight.reshape(-1, 1)
+        assert orig_weight is not None
+        return orig_weight * weight
+
+    def calc_size(self) -> int:
+        model_size = super().calc_size()
+        model_size += self.weight.nelement() * self.weight.element_size()
+        model_size += self.on_input.nelement() * self.on_input.element_size()
+        return model_size
+
+    def to(self, device: Optional[torch.device] = None, dtype: Optional[torch.dtype] = None):
+        super().to(device=device, dtype=dtype)
+
+        self.weight = self.weight.to(device=device, dtype=dtype)
+        self.on_input = self.on_input.to(device=device, dtype=dtype)

invokeai/backend/peft/layers/loha_layer.py

@@ -0,0 +1,68 @@
+from typing import Dict, Optional
+
+import torch
+
+from invokeai.backend.peft.layers.lora_layer_base import LoRALayerBase
+
+
+class LoHALayer(LoRALayerBase):
+    # w1_a: torch.Tensor
+    # w1_b: torch.Tensor
+    # w2_a: torch.Tensor
+    # w2_b: torch.Tensor
+    # t1: Optional[torch.Tensor] = None
+    # t2: Optional[torch.Tensor] = None
+
+    def __init__(self, layer_key: str, values: Dict[str, torch.Tensor]):
+        super().__init__(layer_key, values)
+
+        self.w1_a = values["hada_w1_a"]
+        self.w1_b = values["hada_w1_b"]
+        self.w2_a = values["hada_w2_a"]
+        self.w2_b = values["hada_w2_b"]
+        self.t1 = values.get("hada_t1", None)
+        self.t2 = values.get("hada_t2", None)
+
+        self.rank = self.w1_b.shape[0]
+        self.check_keys(
+            values,
+            {
+                "hada_w1_a",
+                "hada_w1_b",
+                "hada_w2_a",
+                "hada_w2_b",
+                "hada_t1",
+                "hada_t2",
+            },
+        )
+
+    def get_weight(self, orig_weight: torch.Tensor) -> torch.Tensor:
+        if self.t1 is None:
+            weight: torch.Tensor = (self.w1_a @ self.w1_b) * (self.w2_a @ self.w2_b)
+
+        else:
+            rebuild1 = torch.einsum("i j k l, j r, i p -> p r k l", self.t1, self.w1_b, self.w1_a)
+            rebuild2 = torch.einsum("i j k l, j r, i p -> p r k l", self.t2, self.w2_b, self.w2_a)
+            weight = rebuild1 * rebuild2
+
+        return weight
+
+    def calc_size(self) -> int:
+        model_size = super().calc_size()
+        for val in [self.w1_a, self.w1_b, self.w2_a, self.w2_b, self.t1, self.t2]:
+            if val is not None:
+                model_size += val.nelement() * val.element_size()
+        return model_size
+
+    def to(self, device: Optional[torch.device] = None, dtype: Optional[torch.dtype] = None) -> None:
+        super().to(device=device, dtype=dtype)
+
+        self.w1_a = self.w1_a.to(device=device, dtype=dtype)
+        self.w1_b = self.w1_b.to(device=device, dtype=dtype)
+        if self.t1 is not None:
+            self.t1 = self.t1.to(device=device, dtype=dtype)
+
+        self.w2_a = self.w2_a.to(device=device, dtype=dtype)
+        self.w2_b = self.w2_b.to(device=device, dtype=dtype)
+        if self.t2 is not None:
+            self.t2 = self.t2.to(device=device, dtype=dtype)

invokeai/backend/peft/layers/lokr_layer.py

@@ -0,0 +1,114 @@
+from typing import Dict, Optional
+
+import torch
+
+from invokeai.backend.peft.layers.lora_layer_base import LoRALayerBase
+
+
+class LoKRLayer(LoRALayerBase):
+    # w1: Optional[torch.Tensor] = None
+    # w1_a: Optional[torch.Tensor] = None
+    # w1_b: Optional[torch.Tensor] = None
+    # w2: Optional[torch.Tensor] = None
+    # w2_a: Optional[torch.Tensor] = None
+    # w2_b: Optional[torch.Tensor] = None
+    # t2: Optional[torch.Tensor] = None
+
+    def __init__(
+        self,
+        layer_key: str,
+        values: Dict[str, torch.Tensor],
+    ):
+        super().__init__(layer_key, values)
+
+        self.w1 = values.get("lokr_w1", None)
+        if self.w1 is None:
+            self.w1_a = values["lokr_w1_a"]
+            self.w1_b = values["lokr_w1_b"]
+        else:
+            self.w1_b = None
+            self.w1_a = None
+
+        self.w2 = values.get("lokr_w2", None)
+        if self.w2 is None:
+            self.w2_a = values["lokr_w2_a"]
+            self.w2_b = values["lokr_w2_b"]
+        else:
+            self.w2_a = None
+            self.w2_b = None
+
+        self.t2 = values.get("lokr_t2", None)
+
+        if self.w1_b is not None:
+            self.rank = self.w1_b.shape[0]
+        elif self.w2_b is not None:
+            self.rank = self.w2_b.shape[0]
+        else:
+            self.rank = None  # unscaled
+
+        self.check_keys(
+            values,
+            {
+                "lokr_w1",
+                "lokr_w1_a",
+                "lokr_w1_b",
+                "lokr_w2",
+                "lokr_w2_a",
+                "lokr_w2_b",
+                "lokr_t2",
+            },
+        )
+
+    def get_weight(self, orig_weight: torch.Tensor) -> torch.Tensor:
+        w1: Optional[torch.Tensor] = self.w1
+        if w1 is None:
+            assert self.w1_a is not None
+            assert self.w1_b is not None
+            w1 = self.w1_a @ self.w1_b
+
+        w2 = self.w2
+        if w2 is None:
+            if self.t2 is None:
+                assert self.w2_a is not None
+                assert self.w2_b is not None
+                w2 = self.w2_a @ self.w2_b
+            else:
+                w2 = torch.einsum("i j k l, i p, j r -> p r k l", self.t2, self.w2_a, self.w2_b)
+
+        if len(w2.shape) == 4:
+            w1 = w1.unsqueeze(2).unsqueeze(2)
+        w2 = w2.contiguous()
+        assert w1 is not None
+        assert w2 is not None
+        weight = torch.kron(w1, w2)
+
+        return weight
+
+    def calc_size(self) -> int:
+        model_size = super().calc_size()
+        for val in [self.w1, self.w1_a, self.w1_b, self.w2, self.w2_a, self.w2_b, self.t2]:
+            if val is not None:
+                model_size += val.nelement() * val.element_size()
+        return model_size
+
+    def to(self, device: Optional[torch.device] = None, dtype: Optional[torch.dtype] = None) -> None:
+        super().to(device=device, dtype=dtype)
+
+        if self.w1 is not None:
+            self.w1 = self.w1.to(device=device, dtype=dtype)
+        else:
+            assert self.w1_a is not None
+            assert self.w1_b is not None
+            self.w1_a = self.w1_a.to(device=device, dtype=dtype)
+            self.w1_b = self.w1_b.to(device=device, dtype=dtype)
+
+        if self.w2 is not None:
+            self.w2 = self.w2.to(device=device, dtype=dtype)
+        else:
+            assert self.w2_a is not None
+            assert self.w2_b is not None
+            self.w2_a = self.w2_a.to(device=device, dtype=dtype)
+            self.w2_b = self.w2_b.to(device=device, dtype=dtype)
+
+        if self.t2 is not None:
+            self.t2 = self.t2.to(device=device, dtype=dtype)

invokeai/backend/peft/layers/lora_layer.py

@@ -0,0 +1,59 @@
+from typing import Dict, Optional
+
+import torch
+
+from invokeai.backend.peft.layers.lora_layer_base import LoRALayerBase
+
+
+# TODO: find and debug lora/locon with bias
+class LoRALayer(LoRALayerBase):
+    # up: torch.Tensor
+    # mid: Optional[torch.Tensor]
+    # down: torch.Tensor
+
+    def __init__(
+        self,
+        layer_key: str,
+        values: Dict[str, torch.Tensor],
+    ):
+        super().__init__(layer_key, values)
+
+        self.up = values["lora_up.weight"]
+        self.down = values["lora_down.weight"]
+        self.mid = values.get("lora_mid.weight", None)
+
+        self.rank = self.down.shape[0]
+        self.check_keys(
+            values,
+            {
+                "lora_up.weight",
+                "lora_down.weight",
+                "lora_mid.weight",
+            },
+        )
+
+    def get_weight(self, orig_weight: torch.Tensor) -> torch.Tensor:
+        if self.mid is not None:
+            up = self.up.reshape(self.up.shape[0], self.up.shape[1])
+            down = self.down.reshape(self.down.shape[0], self.down.shape[1])
+            weight = torch.einsum("m n w h, i m, n j -> i j w h", self.mid, up, down)
+        else:
+            weight = self.up.reshape(self.up.shape[0], -1) @ self.down.reshape(self.down.shape[0], -1)
+
+        return weight
+
+    def calc_size(self) -> int:
+        model_size = super().calc_size()
+        for val in [self.up, self.mid, self.down]:
+            if val is not None:
+                model_size += val.nelement() * val.element_size()
+        return model_size
+
+    def to(self, device: Optional[torch.device] = None, dtype: Optional[torch.dtype] = None) -> None:
+        super().to(device=device, dtype=dtype)
+
+        self.up = self.up.to(device=device, dtype=dtype)
+        self.down = self.down.to(device=device, dtype=dtype)
+
+        if self.mid is not None:
+            self.mid = self.mid.to(device=device, dtype=dtype)

invokeai/backend/peft/layers/lora_layer_base.py

@@ -0,0 +1,74 @@
+from typing import Dict, Optional, Set
+
+import torch
+
+import invokeai.backend.util.logging as logger
+
+
+class LoRALayerBase:
+    # rank: Optional[int]
+    # alpha: Optional[float]
+    # bias: Optional[torch.Tensor]
+    # layer_key: str
+
+    # @property
+    # def scale(self):
+    #    return self.alpha / self.rank if (self.alpha and self.rank) else 1.0
+
+    def __init__(
+        self,
+        layer_key: str,
+        values: Dict[str, torch.Tensor],
+    ):
+        if "alpha" in values:
+            self.alpha = values["alpha"].item()
+        else:
+            self.alpha = None
+
+        if "bias_indices" in values and "bias_values" in values and "bias_size" in values:
+            self.bias: Optional[torch.Tensor] = torch.sparse_coo_tensor(
+                values["bias_indices"],
+                values["bias_values"],
+                tuple(values["bias_size"]),
+            )
+
+        else:
+            self.bias = None
+
+        self.rank = None  # set in layer implementation
+        self.layer_key = layer_key
+
+    def get_weight(self, orig_weight: torch.Tensor) -> torch.Tensor:
+        raise NotImplementedError()
+
+    def get_bias(self, orig_bias: torch.Tensor) -> Optional[torch.Tensor]:
+        return self.bias
+
+    def get_parameters(self, orig_module: torch.nn.Module) -> Dict[str, torch.Tensor]:
+        params = {"weight": self.get_weight(orig_module.weight)}
+        bias = self.get_bias(orig_module.bias)
+        if bias is not None:
+            params["bias"] = bias
+        return params
+
+    def calc_size(self) -> int:
+        model_size = 0
+        for val in [self.bias]:
+            if val is not None:
+                model_size += val.nelement() * val.element_size()
+        return model_size
+
+    def to(self, device: Optional[torch.device] = None, dtype: Optional[torch.dtype] = None) -> None:
+        if self.bias is not None:
+            self.bias = self.bias.to(device=device, dtype=dtype)
+
+    def check_keys(self, values: Dict[str, torch.Tensor], known_keys: Set[str]):
+        """Log a warning if values contains unhandled keys."""
+        # {"alpha", "bias_indices", "bias_values", "bias_size"} are hard-coded, because they are handled by
+        # `LoRALayerBase`. Sub-classes should provide the known_keys that they handled.
+        all_known_keys = known_keys | {"alpha", "bias_indices", "bias_values", "bias_size"}
+        unknown_keys = set(values.keys()) - all_known_keys
+        if unknown_keys:
+            logger.warning(
+                f"Unexpected keys found in LoRA/LyCORIS layer, model might work incorrectly! Keys: {unknown_keys}"
+            )

invokeai/backend/peft/layers/norm_layer.py

@@ -0,0 +1,37 @@
+from typing import Dict, Optional
+
+import torch
+
+from invokeai.backend.peft.layers.lora_layer_base import LoRALayerBase
+
+
+class NormLayer(LoRALayerBase):
+    # bias handled in LoRALayerBase(calc_size, to)
+    # weight: torch.Tensor
+    # bias: Optional[torch.Tensor]
+
+    def __init__(
+        self,
+        layer_key: str,
+        values: Dict[str, torch.Tensor],
+    ):
+        super().__init__(layer_key, values)
+
+        self.weight = values["w_norm"]
+        self.bias = values.get("b_norm", None)
+
+        self.rank = None  # unscaled
+        self.check_keys(values, {"w_norm", "b_norm"})
+
+    def get_weight(self, orig_weight: torch.Tensor) -> torch.Tensor:
+        return self.weight
+
+    def calc_size(self) -> int:
+        model_size = super().calc_size()
+        model_size += self.weight.nelement() * self.weight.element_size()
+        return model_size
+
+    def to(self, device: Optional[torch.device] = None, dtype: Optional[torch.dtype] = None) -> None:
+        super().to(device=device, dtype=dtype)
+
+        self.weight = self.weight.to(device=device, dtype=dtype)

invokeai/backend/peft/layers/utils.py

@@ -0,0 +1,33 @@
+from typing import Dict
+
+import torch
+
+from invokeai.backend.peft.layers.any_lora_layer import AnyLoRALayer
+from invokeai.backend.peft.layers.full_layer import FullLayer
+from invokeai.backend.peft.layers.ia3_layer import IA3Layer
+from invokeai.backend.peft.layers.loha_layer import LoHALayer
+from invokeai.backend.peft.layers.lokr_layer import LoKRLayer
+from invokeai.backend.peft.layers.lora_layer import LoRALayer
+from invokeai.backend.peft.layers.norm_layer import NormLayer
+
+
+def peft_layer_from_state_dict(layer_key: str, state_dict: Dict[str, torch.Tensor]) -> AnyLoRALayer:
+    # Detect layers according to LyCORIS detection logic(`weight_list_det`)
+    # https://github.com/KohakuBlueleaf/LyCORIS/tree/8ad8000efb79e2b879054da8c9356e6143591bad/lycoris/modules
+
+    if "lora_up.weight" in state_dict:
+        # LoRA a.k.a LoCon
+        return LoRALayer(layer_key, state_dict)
+    elif "hada_w1_a" in state_dict:
+        return LoHALayer(layer_key, state_dict)
+    elif "lokr_w1" in state_dict or "lokr_w1_a" in state_dict:
+        return LoKRLayer(layer_key, state_dict)
+    elif "diff" in state_dict:
+        # Full a.k.a Diff
+        return FullLayer(layer_key, state_dict)
+    elif "on_input" in state_dict:
+        return IA3Layer(layer_key, state_dict)
+    elif "w_norm" in state_dict:
+        return NormLayer(layer_key, state_dict)
+    else:
+        raise ValueError(f"Unsupported lora format: {state_dict.keys()}")

invokeai/backend/peft/lora.py

@@ -0,0 +1,22 @@
+# Copyright (c) 2024 The InvokeAI Development team
+from typing import Dict, Optional
+
+import torch
+
+from invokeai.backend.peft.layers.any_lora_layer import AnyLoRALayer
+from invokeai.backend.raw_model import RawModel
+
+
+class LoRAModelRaw(RawModel):  # (torch.nn.Module):
+    def __init__(self, layers: Dict[str, AnyLoRALayer]):
+        self.layers = layers
+
+    def to(self, device: Optional[torch.device] = None, dtype: Optional[torch.dtype] = None) -> None:
+        for _key, layer in self.layers.items():
+            layer.to(device=device, dtype=dtype)
+
+    def calc_size(self) -> int:
+        model_size = 0
+        for _, layer in self.layers.items():
+            model_size += layer.calc_size()
+        return model_size

invokeai/backend/peft/peft_patcher.py

@@ -0,0 +1,102 @@
+from contextlib import contextmanager
+from typing import Dict, Iterator, Optional, Tuple
+
+import torch
+
+from invokeai.backend.peft.lora import LoRAModelRaw
+from invokeai.backend.util.devices import TorchDevice
+from invokeai.backend.util.original_weights_storage import OriginalWeightsStorage
+
+
+class PeftPatcher:
+    @classmethod
+    @torch.no_grad()
+    @contextmanager
+    def apply_peft_patches(
+        cls,
+        model: torch.nn.Module,
+        patches: Iterator[Tuple[LoRAModelRaw, float]],
+        prefix: str,
+        cached_weights: Optional[Dict[str, torch.Tensor]] = None,
+    ):
+        """Apply one or more PEFT patches to a model.
+
+        :param model: The model to patch.
+        :param loras: An iterator that returns tuples of PEFT patches and associated weights. An iterator is used so
+            that the PEFT patches do not need to be loaded into memory all at once.
+        :param prefix: The keys in the patches will be filtered to only include weights with this prefix.
+        :cached_weights: Read-only copy of the model's state dict in CPU, for efficient unpatching purposes.
+        """
+        original_weights = OriginalWeightsStorage(cached_weights)
+        try:
+            for patch, patch_weight in patches:
+                cls._apply_peft_patch(
+                    model=model,
+                    prefix=prefix,
+                    patch=patch,
+                    patch_weight=patch_weight,
+                    original_weights=original_weights,
+                )
+
+            yield
+        finally:
+            for param_key, weight in original_weights.get_changed_weights():
+                model.get_parameter(param_key).copy_(weight)
+
+    @classmethod
+    @torch.no_grad()
+    def _apply_peft_patch(
+        cls,
+        model: torch.nn.Module,
+        prefix: str,
+        patch: LoRAModelRaw,
+        patch_weight: float,
+        original_weights: OriginalWeightsStorage,
+    ):
+        """
+        Apply one a LoRA to a model.
+        :param model: The model to patch.
+        :param patch: LoRA model to patch in.
+        :param patch_weight: LoRA patch weight.
+        :param prefix: A string prefix that precedes keys used in the LoRAs weight layers.
+        :param original_weights: Storage with original weights, filled by weights which lora patches, used for unpatching.
+        """
+
+        if patch_weight == 0:
+            return
+
+        for layer_key, layer in patch.layers.items():
+            if not layer_key.startswith(prefix):
+                continue
+
+            module = model.get_submodule(layer_key)
+
+            # All of the LoRA weight calculations will be done on the same device as the module weight.
+            # (Performance will be best if this is a CUDA device.)
+            device = module.weight.device
+            dtype = module.weight.dtype
+
+            layer_scale = layer.alpha / layer.rank if (layer.alpha and layer.rank) else 1.0
+
+            # We intentionally move to the target device first, then cast. Experimentally, this was found to
+            # be significantly faster for 16-bit CPU tensors being moved to a CUDA device than doing the
+            # same thing in a single call to '.to(...)'.
+            layer.to(device=device)
+            layer.to(dtype=torch.float32)
+
+            # TODO(ryand): Using torch.autocast(...) over explicit casting may offer a speed benefit on CUDA
+            # devices here. Experimentally, it was found to be very slow on CPU. More investigation needed.
+            for param_name, lora_param_weight in layer.get_parameters(module).items():
+                param_key = layer_key + "." + param_name
+                module_param = module.get_parameter(param_name)
+
+                # Save original weight
+                original_weights.save(param_key, module_param)
+
+                if module_param.shape != lora_param_weight.shape:
+                    lora_param_weight = lora_param_weight.reshape(module_param.shape)
+
+                lora_param_weight *= patch_weight * layer_scale
+                module_param += lora_param_weight.to(dtype=dtype)
+
+            layer.to(device=TorchDevice.CPU_DEVICE)

invokeai/backend/quantization/bnb_llm_int8.py

@@ -54,8 +54,10 @@ class InvokeLinear8bitLt(bnb.nn.Linear8bitLt):
 
         # See `bnb.nn.Linear8bitLt._save_to_state_dict()` for the serialization logic of SCB and weight_format.
         scb = state_dict.pop(prefix + "SCB", None)
-        # weight_format is unused, but we pop it so we can validate that there are no unexpected keys.
-        _weight_format = state_dict.pop(prefix + "weight_format", None)
+
+        # Currently, we only support weight_format=0.
+        weight_format = state_dict.pop(prefix + "weight_format", None)
+        assert weight_format == 0
 
         # TODO(ryand): Technically, we should be using `strict`, `missing_keys`, `unexpected_keys`, and `error_msgs`
         # rather than raising an exception to correctly implement this API.
@@ -89,6 +91,14 @@ class InvokeLinear8bitLt(bnb.nn.Linear8bitLt):
             )
             self.bias = bias if bias is None else torch.nn.Parameter(bias)
 
+        # Reset the state. The persisted fields are based on the initialization behaviour in
+        # `bnb.nn.Linear8bitLt.__init__()`.
+        new_state = bnb.MatmulLtState()
+        new_state.threshold = self.state.threshold
+        new_state.has_fp16_weights = False
+        new_state.use_pool = self.state.use_pool
+        self.state = new_state
+
 
 def _convert_linear_layers_to_llm_8bit(
     module: torch.nn.Module, ignore_modules: set[str], outlier_threshold: float, prefix: str = ""

invokeai/backend/stable_diffusion/diffusion/conditioning_data.py

@@ -43,6 +43,11 @@ class FLUXConditioningInfo:
     clip_embeds: torch.Tensor
     t5_embeds: torch.Tensor
 
+    def to(self, device: torch.device | None = None, dtype: torch.dtype | None = None):
+        self.clip_embeds = self.clip_embeds.to(device=device, dtype=dtype)
+        self.t5_embeds = self.t5_embeds.to(device=device, dtype=dtype)
+        return self
+
 
 @dataclass
 class ConditioningFieldData:

invokeai/backend/stable_diffusion/extensions/lora.py

@@ -12,7 +12,7 @@ from invokeai.backend.util.devices import TorchDevice
 if TYPE_CHECKING:
     from invokeai.app.invocations.model import ModelIdentifierField
     from invokeai.app.services.shared.invocation_context import InvocationContext
-    from invokeai.backend.lora import LoRAModelRaw
+    from invokeai.backend.peft.lora import LoRAModelRaw
     from invokeai.backend.util.original_weights_storage import OriginalWeightsStorage
 
 

invokeai/backend/util/__init__.py

@@ -3,10 +3,9 @@ Initialization file for invokeai.backend.util
 """
 
 from invokeai.backend.util.logging import InvokeAILogger
-from invokeai.backend.util.util import GIG, Chdir, directory_size
+from invokeai.backend.util.util import Chdir, directory_size
 
 __all__ = [
-    "GIG",
     "directory_size",
     "Chdir",
     "InvokeAILogger",

invokeai/backend/util/util.py

@@ -7,9 +7,6 @@ from pathlib import Path
 
 from PIL import Image
 
-# actual size of a gig
-GIG = 1073741824
-
 
 def slugify(value: str, allow_unicode: bool = False) -> str:
     """

invokeai/frontend/web/public/locales/en.json

@@ -696,6 +696,8 @@
         "availableModels": "Available Models",
         "baseModel": "Base Model",
         "cancel": "Cancel",
+        "clipEmbed": "CLIP Embed",
+        "clipVision": "CLIP Vision",
         "config": "Config",
         "convert": "Convert",
         "convertingModelBegin": "Converting Model. Please wait.",
@@ -783,6 +785,7 @@
         "settings": "Settings",
         "simpleModelPlaceholder": "URL or path to a local file or diffusers folder",
         "source": "Source",
+        "spandrelImageToImage": "Image to Image (Spandrel)",
         "starterModels": "Starter Models",
         "starterModelsInModelManager": "Starter Models can be found in Model Manager",
         "syncModels": "Sync Models",
@@ -791,6 +794,7 @@
         "loraTriggerPhrases": "LoRA Trigger Phrases",
         "mainModelTriggerPhrases": "Main Model Trigger Phrases",
         "typePhraseHere": "Type phrase here",
+        "t5Encoder": "T5 Encoder",
         "upcastAttention": "Upcast Attention",
         "uploadImage": "Upload Image",
         "urlOrLocalPath": "URL or Local Path",

invokeai/frontend/web/src/app/components/App.tsx

@@ -14,6 +14,7 @@ import DeleteImageModal from 'features/deleteImageModal/components/DeleteImageMo
 import { DynamicPromptsModal } from 'features/dynamicPrompts/components/DynamicPromptsPreviewModal';
 import { useStarterModelsToast } from 'features/modelManagerV2/hooks/useStarterModelsToast';
 import { StylePresetModal } from 'features/stylePresets/components/StylePresetForm/StylePresetModal';
+import { activeStylePresetIdChanged } from 'features/stylePresets/store/stylePresetSlice';
 import { configChanged } from 'features/system/store/configSlice';
 import { languageSelector } from 'features/system/store/systemSelectors';
 import InvokeTabs from 'features/ui/components/InvokeTabs';
@@ -39,10 +40,17 @@ interface Props {
     action: 'sendToImg2Img' | 'sendToCanvas' | 'useAllParameters';
   };
   selectedWorkflowId?: string;
+  selectedStylePresetId?: string;
   destination?: InvokeTabName | undefined;
 }
 
-const App = ({ config = DEFAULT_CONFIG, selectedImage, selectedWorkflowId, destination }: Props) => {
+const App = ({
+  config = DEFAULT_CONFIG,
+  selectedImage,
+  selectedWorkflowId,
+  selectedStylePresetId,
+  destination,
+}: Props) => {
   const language = useAppSelector(languageSelector);
   const logger = useLogger('system');
   const dispatch = useAppDispatch();
@@ -81,6 +89,12 @@ const App = ({ config = DEFAULT_CONFIG, selectedImage, selectedWorkflowId, desti
     }
   }, [selectedWorkflowId, getAndLoadWorkflow]);
 
+  useEffect(() => {
+    if (selectedStylePresetId) {
+      dispatch(activeStylePresetIdChanged(selectedStylePresetId));
+    }
+  }, [dispatch, selectedStylePresetId]);
+
   useEffect(() => {
     if (destination) {
       dispatch(setActiveTab(destination));

invokeai/frontend/web/src/app/components/InvokeAIUI.tsx

@@ -45,6 +45,7 @@ interface Props extends PropsWithChildren {
     action: 'sendToImg2Img' | 'sendToCanvas' | 'useAllParameters';
   };
   selectedWorkflowId?: string;
+  selectedStylePresetId?: string;
   destination?: InvokeTabName;
   customStarUi?: CustomStarUi;
   socketOptions?: Partial<ManagerOptions & SocketOptions>;
@@ -66,6 +67,7 @@ const InvokeAIUI = ({
   queueId,
   selectedImage,
   selectedWorkflowId,
+  selectedStylePresetId,
   destination,
   customStarUi,
   socketOptions,
@@ -227,6 +229,7 @@ const InvokeAIUI = ({
                 config={config}
                 selectedImage={selectedImage}
                 selectedWorkflowId={selectedWorkflowId}
+                selectedStylePresetId={selectedStylePresetId}
                 destination={destination}
               />
             </AppDndContext>

invokeai/frontend/web/src/features/modelManagerV2/subpanels/ModelManagerPanel/ModelList.tsx

@@ -175,12 +175,12 @@ const ModelList = () => {
         {/* T5 Encoders List */}
         {isLoadingT5EncoderModels && <FetchingModelsLoader loadingMessage="Loading T5 Encoder Models..." />}
         {!isLoadingT5EncoderModels && filteredT5EncoderModels.length > 0 && (
-          <ModelListWrapper title="T5 Encoder" modelList={filteredT5EncoderModels} key="t5-encoder" />
+          <ModelListWrapper title={t('modelManager.t5Encoder')} modelList={filteredT5EncoderModels} key="t5-encoder" />
         )}
         {/* Clip Embed List */}
         {isLoadingClipEmbedModels && <FetchingModelsLoader loadingMessage="Loading Clip Embed Models..." />}
         {!isLoadingClipEmbedModels && filteredClipEmbedModels.length > 0 && (
-          <ModelListWrapper title="Clip Embed" modelList={filteredClipEmbedModels} key="clip-embed" />
+          <ModelListWrapper title={t('modelManager.clipEmbed')} modelList={filteredClipEmbedModels} key="clip-embed" />
         )}
         {/* Spandrel Image to Image List */}
         {isLoadingSpandrelImageToImageModels && (
@@ -188,7 +188,7 @@ const ModelList = () => {
         )}
         {!isLoadingSpandrelImageToImageModels && filteredSpandrelImageToImageModels.length > 0 && (
           <ModelListWrapper
-            title="Image-to-Image"
+            title={t('modelManager.spandrelImageToImage')}
             modelList={filteredSpandrelImageToImageModels}
             key="spandrel-image-to-image"
           />

invokeai/frontend/web/src/features/modelManagerV2/subpanels/ModelManagerPanel/ModelTypeFilter.tsx

@@ -19,11 +19,10 @@ export const ModelTypeFilter = memo(() => {
       controlnet: 'ControlNet',
       vae: 'VAE',
       t2i_adapter: t('common.t2iAdapter'),
-      t5_encoder: 'T5Encoder',
-      clip_embed: 'Clip Embed',
+      t5_encoder: t('modelManager.t5Encoder'),
+      clip_embed: t('modelManager.clipEmbed'),
       ip_adapter: t('common.ipAdapter'),
-      clip_vision: 'Clip Vision',
-      spandrel_image_to_image: 'Image-to-Image',
+      spandrel_image_to_image: t('modelManager.spandrelImageToImage'),
     }),
     [t]
   );

invokeai/frontend/web/src/features/nodes/components/flow/nodes/Invocation/fields/InputFieldRenderer.tsx

@@ -6,6 +6,8 @@ import {
   isBoardFieldInputTemplate,
   isBooleanFieldInputInstance,
   isBooleanFieldInputTemplate,
+  isCLIPEmbedModelFieldInputInstance,
+  isCLIPEmbedModelFieldInputTemplate,
   isColorFieldInputInstance,
   isColorFieldInputTemplate,
   isControlNetModelFieldInputInstance,
@@ -16,6 +18,8 @@ import {
   isFloatFieldInputTemplate,
   isFluxMainModelFieldInputInstance,
   isFluxMainModelFieldInputTemplate,
+  isFluxVAEModelFieldInputInstance,
+  isFluxVAEModelFieldInputTemplate,
   isImageFieldInputInstance,
   isImageFieldInputTemplate,
   isIntegerFieldInputInstance,
@@ -49,10 +53,12 @@ import { memo } from 'react';
 
 import BoardFieldInputComponent from './inputs/BoardFieldInputComponent';
 import BooleanFieldInputComponent from './inputs/BooleanFieldInputComponent';
+import CLIPEmbedModelFieldInputComponent from './inputs/CLIPEmbedModelFieldInputComponent';
 import ColorFieldInputComponent from './inputs/ColorFieldInputComponent';
 import ControlNetModelFieldInputComponent from './inputs/ControlNetModelFieldInputComponent';
 import EnumFieldInputComponent from './inputs/EnumFieldInputComponent';
 import FluxMainModelFieldInputComponent from './inputs/FluxMainModelFieldInputComponent';
+import FluxVAEModelFieldInputComponent from './inputs/FluxVAEModelFieldInputComponent';
 import ImageFieldInputComponent from './inputs/ImageFieldInputComponent';
 import IPAdapterModelFieldInputComponent from './inputs/IPAdapterModelFieldInputComponent';
 import LoRAModelFieldInputComponent from './inputs/LoRAModelFieldInputComponent';
@@ -122,6 +128,13 @@ const InputFieldRenderer = ({ nodeId, fieldName }: InputFieldProps) => {
   if (isT5EncoderModelFieldInputInstance(fieldInstance) && isT5EncoderModelFieldInputTemplate(fieldTemplate)) {
     return <T5EncoderModelFieldInputComponent nodeId={nodeId} field={fieldInstance} fieldTemplate={fieldTemplate} />;
   }
+  if (isCLIPEmbedModelFieldInputInstance(fieldInstance) && isCLIPEmbedModelFieldInputTemplate(fieldTemplate)) {
+    return <CLIPEmbedModelFieldInputComponent nodeId={nodeId} field={fieldInstance} fieldTemplate={fieldTemplate} />;
+  }
+
+  if (isFluxVAEModelFieldInputInstance(fieldInstance) && isFluxVAEModelFieldInputTemplate(fieldTemplate)) {
+    return <FluxVAEModelFieldInputComponent nodeId={nodeId} field={fieldInstance} fieldTemplate={fieldTemplate} />;
+  }
 
   if (isLoRAModelFieldInputInstance(fieldInstance) && isLoRAModelFieldInputTemplate(fieldTemplate)) {
     return <LoRAModelFieldInputComponent nodeId={nodeId} field={fieldInstance} fieldTemplate={fieldTemplate} />;

invokeai/frontend/web/src/features/nodes/components/flow/nodes/Invocation/fields/inputs/CLIPEmbedModelFieldInputComponent.tsx

@@ -0,0 +1,60 @@
+import { Combobox, Flex, FormControl, Tooltip } from '@invoke-ai/ui-library';
+import { useAppDispatch, useAppSelector } from 'app/store/storeHooks';
+import { useGroupedModelCombobox } from 'common/hooks/useGroupedModelCombobox';
+import { fieldCLIPEmbedValueChanged } from 'features/nodes/store/nodesSlice';
+import type { CLIPEmbedModelFieldInputInstance, CLIPEmbedModelFieldInputTemplate } from 'features/nodes/types/field';
+import { memo, useCallback } from 'react';
+import { useTranslation } from 'react-i18next';
+import { useClipEmbedModels } from 'services/api/hooks/modelsByType';
+import type { ClipEmbedModelConfig } from 'services/api/types';
+
+import type { FieldComponentProps } from './types';
+
+type Props = FieldComponentProps<CLIPEmbedModelFieldInputInstance, CLIPEmbedModelFieldInputTemplate>;
+
+const CLIPEmbedModelFieldInputComponent = (props: Props) => {
+  const { nodeId, field } = props;
+  const { t } = useTranslation();
+  const disabledTabs = useAppSelector((s) => s.config.disabledTabs);
+  const dispatch = useAppDispatch();
+  const [modelConfigs, { isLoading }] = useClipEmbedModels();
+  const _onChange = useCallback(
+    (value: ClipEmbedModelConfig | null) => {
+      if (!value) {
+        return;
+      }
+      dispatch(
+        fieldCLIPEmbedValueChanged({
+          nodeId,
+          fieldName: field.name,
+          value,
+        })
+      );
+    },
+    [dispatch, field.name, nodeId]
+  );
+  const { options, value, onChange, placeholder, noOptionsMessage } = useGroupedModelCombobox({
+    modelConfigs,
+    onChange: _onChange,
+    isLoading,
+    selectedModel: field.value,
+  });
+
+  return (
+    <Flex w="full" alignItems="center" gap={2}>
+      <Tooltip label={!disabledTabs.includes('models') && t('modelManager.starterModelsInModelManager')}>
+        <FormControl className="nowheel nodrag" isDisabled={!options.length} isInvalid={!value}>
+          <Combobox
+            value={value}
+            placeholder={placeholder}
+            options={options}
+            onChange={onChange}
+            noOptionsMessage={noOptionsMessage}
+          />
+        </FormControl>
+      </Tooltip>
+    </Flex>
+  );
+};
+
+export default memo(CLIPEmbedModelFieldInputComponent);

invokeai/frontend/web/src/features/nodes/components/flow/nodes/Invocation/fields/inputs/FluxVAEModelFieldInputComponent.tsx

@@ -0,0 +1,60 @@
+import { Combobox, Flex, FormControl, Tooltip } from '@invoke-ai/ui-library';
+import { useAppDispatch, useAppSelector } from 'app/store/storeHooks';
+import { useGroupedModelCombobox } from 'common/hooks/useGroupedModelCombobox';
+import { fieldFluxVAEModelValueChanged } from 'features/nodes/store/nodesSlice';
+import type { FluxVAEModelFieldInputInstance, FluxVAEModelFieldInputTemplate } from 'features/nodes/types/field';
+import { memo, useCallback } from 'react';
+import { useTranslation } from 'react-i18next';
+import { useFluxVAEModels } from 'services/api/hooks/modelsByType';
+import type { VAEModelConfig } from 'services/api/types';
+
+import type { FieldComponentProps } from './types';
+
+type Props = FieldComponentProps<FluxVAEModelFieldInputInstance, FluxVAEModelFieldInputTemplate>;
+
+const FluxVAEModelFieldInputComponent = (props: Props) => {
+  const { nodeId, field } = props;
+  const { t } = useTranslation();
+  const disabledTabs = useAppSelector((s) => s.config.disabledTabs);
+  const dispatch = useAppDispatch();
+  const [modelConfigs, { isLoading }] = useFluxVAEModels();
+  const _onChange = useCallback(
+    (value: VAEModelConfig | null) => {
+      if (!value) {
+        return;
+      }
+      dispatch(
+        fieldFluxVAEModelValueChanged({
+          nodeId,
+          fieldName: field.name,
+          value,
+        })
+      );
+    },
+    [dispatch, field.name, nodeId]
+  );
+  const { options, value, onChange, placeholder, noOptionsMessage } = useGroupedModelCombobox({
+    modelConfigs,
+    onChange: _onChange,
+    isLoading,
+    selectedModel: field.value,
+  });
+
+  return (
+    <Flex w="full" alignItems="center" gap={2}>
+      <Tooltip label={!disabledTabs.includes('models') && t('modelManager.starterModelsInModelManager')}>
+        <FormControl className="nowheel nodrag" isDisabled={!options.length} isInvalid={!value}>
+          <Combobox
+            value={value}
+            placeholder={placeholder}
+            options={options}
+            onChange={onChange}
+            noOptionsMessage={noOptionsMessage}
+          />
+        </FormControl>
+      </Tooltip>
+    </Flex>
+  );
+};
+
+export default memo(FluxVAEModelFieldInputComponent);

invokeai/frontend/web/src/features/nodes/store/nodesSlice.ts

@@ -6,11 +6,13 @@ import { SHARED_NODE_PROPERTIES } from 'features/nodes/types/constants';
 import type {
   BoardFieldValue,
   BooleanFieldValue,
+  CLIPEmbedModelFieldValue,
   ColorFieldValue,
   ControlNetModelFieldValue,
   EnumFieldValue,
   FieldValue,
   FloatFieldValue,
+  FluxVAEModelFieldValue,
   ImageFieldValue,
   IntegerFieldValue,
   IPAdapterModelFieldValue,
@@ -29,10 +31,12 @@ import type {
 import {
   zBoardFieldValue,
   zBooleanFieldValue,
+  zCLIPEmbedModelFieldValue,
   zColorFieldValue,
   zControlNetModelFieldValue,
   zEnumFieldValue,
   zFloatFieldValue,
+  zFluxVAEModelFieldValue,
   zImageFieldValue,
   zIntegerFieldValue,
   zIPAdapterModelFieldValue,
@@ -346,6 +350,12 @@ export const nodesSlice = createSlice({
     fieldT5EncoderValueChanged: (state, action: FieldValueAction<T5EncoderModelFieldValue>) => {
       fieldValueReducer(state, action, zT5EncoderModelFieldValue);
     },
+    fieldCLIPEmbedValueChanged: (state, action: FieldValueAction<CLIPEmbedModelFieldValue>) => {
+      fieldValueReducer(state, action, zCLIPEmbedModelFieldValue);
+    },
+    fieldFluxVAEModelValueChanged: (state, action: FieldValueAction<FluxVAEModelFieldValue>) => {
+      fieldValueReducer(state, action, zFluxVAEModelFieldValue);
+    },
     fieldEnumModelValueChanged: (state, action: FieldValueAction<EnumFieldValue>) => {
       fieldValueReducer(state, action, zEnumFieldValue);
     },
@@ -408,6 +418,8 @@ export const {
   fieldStringValueChanged,
   fieldVaeModelValueChanged,
   fieldT5EncoderValueChanged,
+  fieldCLIPEmbedValueChanged,
+  fieldFluxVAEModelValueChanged,
   nodeEditorReset,
   nodeIsIntermediateChanged,
   nodeIsOpenChanged,
@@ -521,6 +533,8 @@ export const isAnyNodeOrEdgeMutation = isAnyOf(
   fieldStringValueChanged,
   fieldVaeModelValueChanged,
   fieldT5EncoderValueChanged,
+  fieldCLIPEmbedValueChanged,
+  fieldFluxVAEModelValueChanged,
   nodesChanged,
   nodeIsIntermediateChanged,
   nodeIsOpenChanged,

invokeai/frontend/web/src/features/nodes/types/field.ts

@@ -151,6 +151,14 @@ const zT5EncoderModelFieldType = zFieldTypeBase.extend({
   name: z.literal('T5EncoderModelField'),
   originalType: zStatelessFieldType.optional(),
 });
+const zCLIPEmbedModelFieldType = zFieldTypeBase.extend({
+  name: z.literal('CLIPEmbedModelField'),
+  originalType: zStatelessFieldType.optional(),
+});
+const zFluxVAEModelFieldType = zFieldTypeBase.extend({
+  name: z.literal('FluxVAEModelField'),
+  originalType: zStatelessFieldType.optional(),
+});
 const zSchedulerFieldType = zFieldTypeBase.extend({
   name: z.literal('SchedulerField'),
   originalType: zStatelessFieldType.optional(),
@@ -175,6 +183,8 @@ const zStatefulFieldType = z.union([
   zT2IAdapterModelFieldType,
   zSpandrelImageToImageModelFieldType,
   zT5EncoderModelFieldType,
+  zCLIPEmbedModelFieldType,
+  zFluxVAEModelFieldType,
   zColorFieldType,
   zSchedulerFieldType,
 ]);
@@ -667,7 +677,53 @@ export const isT5EncoderModelFieldInputInstance = (val: unknown): val is T5Encod
 export const isT5EncoderModelFieldInputTemplate = (val: unknown): val is T5EncoderModelFieldInputTemplate =>
   zT5EncoderModelFieldInputTemplate.safeParse(val).success;
 
-// #endregio
+// #endregion
+
+// #region FluxVAEModelField
+
+export const zFluxVAEModelFieldValue = zModelIdentifierField.optional();
+const zFluxVAEModelFieldInputInstance = zFieldInputInstanceBase.extend({
+  value: zFluxVAEModelFieldValue,
+});
+const zFluxVAEModelFieldInputTemplate = zFieldInputTemplateBase.extend({
+  type: zFluxVAEModelFieldType,
+  originalType: zFieldType.optional(),
+  default: zFluxVAEModelFieldValue,
+});
+
+export type FluxVAEModelFieldValue = z.infer<typeof zFluxVAEModelFieldValue>;
+
+export type FluxVAEModelFieldInputInstance = z.infer<typeof zFluxVAEModelFieldInputInstance>;
+export type FluxVAEModelFieldInputTemplate = z.infer<typeof zFluxVAEModelFieldInputTemplate>;
+export const isFluxVAEModelFieldInputInstance = (val: unknown): val is FluxVAEModelFieldInputInstance =>
+  zFluxVAEModelFieldInputInstance.safeParse(val).success;
+export const isFluxVAEModelFieldInputTemplate = (val: unknown): val is FluxVAEModelFieldInputTemplate =>
+  zFluxVAEModelFieldInputTemplate.safeParse(val).success;
+
+// #endregion
+
+// #region CLIPEmbedModelField
+
+export const zCLIPEmbedModelFieldValue = zModelIdentifierField.optional();
+const zCLIPEmbedModelFieldInputInstance = zFieldInputInstanceBase.extend({
+  value: zCLIPEmbedModelFieldValue,
+});
+const zCLIPEmbedModelFieldInputTemplate = zFieldInputTemplateBase.extend({
+  type: zCLIPEmbedModelFieldType,
+  originalType: zFieldType.optional(),
+  default: zCLIPEmbedModelFieldValue,
+});
+
+export type CLIPEmbedModelFieldValue = z.infer<typeof zCLIPEmbedModelFieldValue>;
+
+export type CLIPEmbedModelFieldInputInstance = z.infer<typeof zCLIPEmbedModelFieldInputInstance>;
+export type CLIPEmbedModelFieldInputTemplate = z.infer<typeof zCLIPEmbedModelFieldInputTemplate>;
+export const isCLIPEmbedModelFieldInputInstance = (val: unknown): val is CLIPEmbedModelFieldInputInstance =>
+  zCLIPEmbedModelFieldInputInstance.safeParse(val).success;
+export const isCLIPEmbedModelFieldInputTemplate = (val: unknown): val is CLIPEmbedModelFieldInputTemplate =>
+  zCLIPEmbedModelFieldInputTemplate.safeParse(val).success;
+
+// #endregion
 
 // #region SchedulerField
 
@@ -758,6 +814,8 @@ export const zStatefulFieldValue = z.union([
   zT2IAdapterModelFieldValue,
   zSpandrelImageToImageModelFieldValue,
   zT5EncoderModelFieldValue,
+  zFluxVAEModelFieldValue,
+  zCLIPEmbedModelFieldValue,
   zColorFieldValue,
   zSchedulerFieldValue,
 ]);
@@ -788,6 +846,8 @@ const zStatefulFieldInputInstance = z.union([
   zT2IAdapterModelFieldInputInstance,
   zSpandrelImageToImageModelFieldInputInstance,
   zT5EncoderModelFieldInputInstance,
+  zFluxVAEModelFieldInputInstance,
+  zCLIPEmbedModelFieldInputInstance,
   zColorFieldInputInstance,
   zSchedulerFieldInputInstance,
 ]);
@@ -819,6 +879,8 @@ const zStatefulFieldInputTemplate = z.union([
   zT2IAdapterModelFieldInputTemplate,
   zSpandrelImageToImageModelFieldInputTemplate,
   zT5EncoderModelFieldInputTemplate,
+  zFluxVAEModelFieldInputTemplate,
+  zCLIPEmbedModelFieldInputTemplate,
   zColorFieldInputTemplate,
   zSchedulerFieldInputTemplate,
   zStatelessFieldInputTemplate,

invokeai/frontend/web/src/features/nodes/util/schema/buildFieldInputInstance.ts

@@ -23,6 +23,8 @@ const FIELD_VALUE_FALLBACK_MAP: Record<StatefulFieldType['name'], FieldValue> =
   VAEModelField: undefined,
   ControlNetModelField: undefined,
   T5EncoderModelField: undefined,
+  FluxVAEModelField: undefined,
+  CLIPEmbedModelField: undefined,
 };
 
 export const buildFieldInputInstance = (id: string, template: FieldInputTemplate): FieldInputInstance => {

invokeai/frontend/web/src/features/nodes/util/schema/buildFieldInputTemplate.ts

@@ -2,6 +2,7 @@ import { FieldParseError } from 'features/nodes/types/error';
 import type {
   BoardFieldInputTemplate,
   BooleanFieldInputTemplate,
+  CLIPEmbedModelFieldInputTemplate,
   ColorFieldInputTemplate,
   ControlNetModelFieldInputTemplate,
   EnumFieldInputTemplate,
@@ -9,6 +10,7 @@ import type {
   FieldType,
   FloatFieldInputTemplate,
   FluxMainModelFieldInputTemplate,
+  FluxVAEModelFieldInputTemplate,
   ImageFieldInputTemplate,
   IntegerFieldInputTemplate,
   IPAdapterModelFieldInputTemplate,
@@ -238,6 +240,34 @@ const buildT5EncoderModelFieldInputTemplate: FieldInputTemplateBuilder<T5Encoder
   return template;
 };
 
+const buildCLIPEmbedModelFieldInputTemplate: FieldInputTemplateBuilder<CLIPEmbedModelFieldInputTemplate> = ({
+  schemaObject,
+  baseField,
+  fieldType,
+}) => {
+  const template: CLIPEmbedModelFieldInputTemplate = {
+    ...baseField,
+    type: fieldType,
+    default: schemaObject.default ?? undefined,
+  };
+
+  return template;
+};
+
+const buildFluxVAEModelFieldInputTemplate: FieldInputTemplateBuilder<FluxVAEModelFieldInputTemplate> = ({
+  schemaObject,
+  baseField,
+  fieldType,
+}) => {
+  const template: FluxVAEModelFieldInputTemplate = {
+    ...baseField,
+    type: fieldType,
+    default: schemaObject.default ?? undefined,
+  };
+
+  return template;
+};
+
 const buildLoRAModelFieldInputTemplate: FieldInputTemplateBuilder<LoRAModelFieldInputTemplate> = ({
   schemaObject,
   baseField,
@@ -423,6 +453,8 @@ export const TEMPLATE_BUILDER_MAP: Record<StatefulFieldType['name'], FieldInputT
   SpandrelImageToImageModelField: buildSpandrelImageToImageModelFieldInputTemplate,
   VAEModelField: buildVAEModelFieldInputTemplate,
   T5EncoderModelField: buildT5EncoderModelFieldInputTemplate,
+  CLIPEmbedModelField: buildCLIPEmbedModelFieldInputTemplate,
+  FluxVAEModelField: buildFluxVAEModelFieldInputTemplate,
 } as const;
 
 export const buildFieldInputTemplate = (

invokeai/frontend/web/src/services/api/hooks/modelsByType.ts

@@ -7,6 +7,7 @@ import {
   isControlNetModelConfig,
   isControlNetOrT2IAdapterModelConfig,
   isFluxMainModelModelConfig,
+  isFluxVAEModelConfig,
   isIPAdapterModelConfig,
   isLoRAModelConfig,
   isNonRefinerMainModelConfig,
@@ -52,3 +53,4 @@ export const useSpandrelImageToImageModels = buildModelsHook(isSpandrelImageToIm
 export const useIPAdapterModels = buildModelsHook(isIPAdapterModelConfig);
 export const useEmbeddingModels = buildModelsHook(isTIModelConfig);
 export const useVAEModels = buildModelsHook(isVAEModelConfig);
+export const useFluxVAEModels = buildModelsHook(isFluxVAEModelConfig);

invokeai/frontend/web/src/services/api/types.ts

@@ -51,7 +51,7 @@ export type VAEModelConfig = S['VAECheckpointConfig'] | S['VAEDiffusersConfig'];
 export type ControlNetModelConfig = S['ControlNetDiffusersConfig'] | S['ControlNetCheckpointConfig'];
 export type IPAdapterModelConfig = S['IPAdapterInvokeAIConfig'] | S['IPAdapterCheckpointConfig'];
 export type T2IAdapterModelConfig = S['T2IAdapterConfig'];
-type ClipEmbedModelConfig = S['CLIPEmbedDiffusersConfig'];
+export type ClipEmbedModelConfig = S['CLIPEmbedDiffusersConfig'];
 export type T5EncoderModelConfig = S['T5EncoderConfig'];
 export type T5EncoderBnbQuantizedLlmInt8bModelConfig = S['T5EncoderBnbQuantizedLlmInt8bConfig'];
 export type SpandrelImageToImageModelConfig = S['SpandrelImageToImageConfig'];
@@ -82,6 +82,10 @@ export const isVAEModelConfig = (config: AnyModelConfig): config is VAEModelConf
   return config.type === 'vae';
 };
 
+export const isFluxVAEModelConfig = (config: AnyModelConfig): config is VAEModelConfig => {
+  return config.type === 'vae' && config.base === 'flux';
+};
+
 export const isControlNetModelConfig = (config: AnyModelConfig): config is ControlNetModelConfig => {
   return config.type === 'controlnet';
 };

invokeai/version/invokeai_version.py

@@ -1 +1 @@
-__version__ = "4.2.8post1"
+__version__ = "4.2.9rc1"

pyproject.toml

@@ -130,8 +130,6 @@ dependencies = [
 
 [project.scripts]
 "invokeai-web" = "invokeai.app.run_app:run_app"
-"invokeai-import-images" = "invokeai.frontend.install.import_images:main"
-"invokeai-db-maintenance" = "invokeai.backend.util.db_maintenance:main"
 
 [project.urls]
 "Homepage" = "https://invoke-ai.github.io/InvokeAI/"

scripts/allocate_vram.py

@@ -0,0 +1,63 @@
+import argparse
+
+import torch
+
+
+def display_vram_usage():
+    """Displays the total, allocated, and free VRAM on the current CUDA device."""
+
+    assert torch.cuda.is_available(), "CUDA is not available"
+    device = torch.device("cuda")
+
+    total_vram = torch.cuda.get_device_properties(device).total_memory
+    allocated_vram = torch.cuda.memory_allocated(device)
+    free_vram = total_vram - allocated_vram
+
+    print(f"Total VRAM: {total_vram / (1024 * 1024 * 1024):.2f} GB")
+    print(f"Allocated VRAM: {allocated_vram / (1024 * 1024 * 1024):.2f} GB")
+    print(f"Free VRAM: {free_vram / (1024 * 1024 * 1024):.2f} GB")
+
+
+def allocate_vram(target_gb: float, target_free: bool = False):
+    """Allocates VRAM on the current CUDA device. After allocation, the script will pause until the user presses Enter
+    or ends the script, at which point the VRAM will be released.
+
+    Args:
+        target_gb (float): Amount of VRAM to allocate in GB.
+        target_free (bool, optional): Instead of allocating <target_gb> VRAM, enough VRAM will be allocated so the system has <target_gb> of VRAM free. For example, if <target_gb> is 2 GB, the script will allocate VRAM until the free VRAM is 2 GB.
+    """
+    assert torch.cuda.is_available(), "CUDA is not available"
+    device = torch.device("cuda")
+
+    if target_free:
+        total_vram = torch.cuda.get_device_properties(device).total_memory
+        free_vram = total_vram - torch.cuda.memory_allocated(device)
+        target_free_bytes = target_gb * 1024 * 1024 * 1024
+        bytes_to_allocate = free_vram - target_free_bytes
+
+        if bytes_to_allocate <= 0:
+            print(f"Already at or below the target free VRAM of {target_gb} GB")
+            return
+    else:
+        bytes_to_allocate = target_gb * 1024 * 1024 * 1024
+
+    # FloatTensor (4 bytes per element)
+    _tensor = torch.empty(int(bytes_to_allocate / 4), dtype=torch.float, device="cuda")
+
+    display_vram_usage()
+
+    input("Press Enter to release VRAM allocation and exit...")
+
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser(description="Allocate VRAM for testing purposes. Only works on CUDA devices.")
+    parser.add_argument("target_gb", type=float, help="Amount of VRAM to allocate in GB.")
+    parser.add_argument(
+        "--target-free",
+        action="store_true",
+        help="Instead of allocating <target_gb> VRAM, enough VRAM will be allocated so the system has <target_gb> of VRAM free. For example, if <target_gb> is 2 GB, the script will allocate VRAM until the free VRAM is 2 GB.",
+    )
+
+    args = parser.parse_args()
+
+    allocate_vram(target_gb=args.target_gb, target_free=args.target_free)

tests/backend/flux/test_sampling_utils.py

@@ -0,0 +1,42 @@
+import pytest
+import torch
+
+from invokeai.backend.flux.sampling_utils import clip_timestep_schedule
+
+
+def float_lists_almost_equal(list1: list[float], list2: list[float], tol: float = 1e-6) -> bool:
+    return all(abs(a - b) < tol for a, b in zip(list1, list2, strict=True))
+
+
+@pytest.mark.parametrize(
+    ["denoising_start", "denoising_end", "expected_timesteps", "raises"],
+    [
+        (0.0, 1.0, [1.0, 0.75, 0.5, 0.25, 0.0], False),  # Default case.
+        (-0.1, 1.0, [], True),  # Negative denoising_start should raise.
+        (0.0, 1.1, [], True),  # denoising_end > 1 should raise.
+        (0.5, 0.0, [], True),  # denoising_start > denoising_end should raise.
+        (0.0, 0.0, [1.0], False),  # denoising_end == 0.
+        (1.0, 1.0, [0.0], False),  # denoising_start == 1.
+        (0.2, 0.8, [1.0, 0.75, 0.5, 0.25], False),  # Middle of the schedule.
+        # If we denoise from 0.0 to x, then from x to 1.0, it is important that denoise_end = x and denoise_start = x
+        # map to the same timestep. We test this first when x is equal to a timestep, then when it falls between two
+        # timesteps.
+        # x = 0.5
+        (0.0, 0.5, [1.0, 0.75, 0.5], False),
+        (0.5, 1.0, [0.5, 0.25, 0.0], False),
+        # x = 0.3
+        (0.0, 0.3, [1.0, 0.75], False),
+        (0.3, 1.0, [0.75, 0.5, 0.25, 0.0], False),
+    ],
+)
+def test_clip_timestep_schedule(
+    denoising_start: float, denoising_end: float, expected_timesteps: list[float], raises: bool
+):
+    timesteps = torch.linspace(1, 0, 5).tolist()
+    if raises:
+        with pytest.raises(AssertionError):
+            clip_timestep_schedule(timesteps, denoising_start, denoising_end)
+    else:
+        assert float_lists_almost_equal(
+            clip_timestep_schedule(timesteps, denoising_start, denoising_end), expected_timesteps
+        )

tests/backend/model_manager/test_lora.py

@@ -1,12 +1,9 @@
-# test that if the model's device changes while the lora is applied, the weights can still be restored
-
-# test that LoRA patching works on both CPU and CUDA
-
 import pytest
 import torch
 
-from invokeai.backend.lora import LoRALayer, LoRAModelRaw
 from invokeai.backend.model_patcher import ModelPatcher
+from invokeai.backend.peft.layers.lora_layer import LoRALayer
+from invokeai.backend.peft.lora import LoRAModelRaw
 
 
 @pytest.mark.parametrize(
@@ -38,7 +35,7 @@ def test_apply_lora(device):
             },
         )
     }
-    lora = LoRAModelRaw("lora_name", lora_layers)
+    lora = LoRAModelRaw(lora_layers)
 
     lora_weight = 0.5
     orig_linear_weight = model["linear_layer_1"].weight.data.detach().clone()
@@ -82,7 +79,7 @@ def test_apply_lora_change_device():
             },
         )
     }
-    lora = LoRAModelRaw("lora_name", lora_layers)
+    lora = LoRAModelRaw(lora_layers)
 
     orig_linear_weight = model["linear_layer_1"].weight.data.detach().clone()
 

tests/backend/peft/conversions/lora_state_dicts/flux_lora_diffusers_format.py

@@ -0,0 +1,990 @@
+state_dict_keys = [
+    "transformer.single_transformer_blocks.0.attn.to_k.lora_A.weight",
+    "transformer.single_transformer_blocks.0.attn.to_k.lora_B.weight",
+    "transformer.single_transformer_blocks.0.attn.to_q.lora_A.weight",
+    "transformer.single_transformer_blocks.0.attn.to_q.lora_B.weight",
+    "transformer.single_transformer_blocks.0.attn.to_v.lora_A.weight",
+    "transformer.single_transformer_blocks.0.attn.to_v.lora_B.weight",
+    "transformer.single_transformer_blocks.0.norm.linear.lora_A.weight",
+    "transformer.single_transformer_blocks.0.norm.linear.lora_B.weight",
+    "transformer.single_transformer_blocks.0.proj_mlp.lora_A.weight",
+    "transformer.single_transformer_blocks.0.proj_mlp.lora_B.weight",
+    "transformer.single_transformer_blocks.0.proj_out.lora_A.weight",
+    "transformer.single_transformer_blocks.0.proj_out.lora_B.weight",
+    "transformer.single_transformer_blocks.1.attn.to_k.lora_A.weight",
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+    "transformer.transformer_blocks.9.norm1_context.linear.lora_A.weight",
+    "transformer.transformer_blocks.9.norm1_context.linear.lora_B.weight",
+]

tests/backend/peft/conversions/lora_state_dicts/flux_lora_kohya_format.py

@@ -0,0 +1,914 @@
+state_dict_keys = [
+    "lora_unet_double_blocks_0_img_attn_proj.alpha",
+    "lora_unet_double_blocks_0_img_attn_proj.lora_down.weight",
+    "lora_unet_double_blocks_0_img_attn_proj.lora_up.weight",
+    "lora_unet_double_blocks_0_img_attn_qkv.alpha",
+    "lora_unet_double_blocks_0_img_attn_qkv.lora_down.weight",
+    "lora_unet_double_blocks_0_img_attn_qkv.lora_up.weight",
+    "lora_unet_double_blocks_0_img_mlp_0.alpha",
+    "lora_unet_double_blocks_0_img_mlp_0.lora_down.weight",
+    "lora_unet_double_blocks_0_img_mlp_0.lora_up.weight",
+    "lora_unet_double_blocks_0_img_mlp_2.alpha",
+    "lora_unet_double_blocks_0_img_mlp_2.lora_down.weight",
+    "lora_unet_double_blocks_0_img_mlp_2.lora_up.weight",
+    "lora_unet_double_blocks_0_img_mod_lin.alpha",
+    "lora_unet_double_blocks_0_img_mod_lin.lora_down.weight",
+    "lora_unet_double_blocks_0_img_mod_lin.lora_up.weight",
+    "lora_unet_double_blocks_0_txt_attn_proj.alpha",
+    "lora_unet_double_blocks_0_txt_attn_proj.lora_down.weight",
+    "lora_unet_double_blocks_0_txt_attn_proj.lora_up.weight",
+    "lora_unet_double_blocks_0_txt_attn_qkv.alpha",
+    "lora_unet_double_blocks_0_txt_attn_qkv.lora_down.weight",
+    "lora_unet_double_blocks_0_txt_attn_qkv.lora_up.weight",
+    "lora_unet_double_blocks_0_txt_mlp_0.alpha",
+    "lora_unet_double_blocks_0_txt_mlp_0.lora_down.weight",
+    "lora_unet_double_blocks_0_txt_mlp_0.lora_up.weight",
+    "lora_unet_double_blocks_0_txt_mlp_2.alpha",
+    "lora_unet_double_blocks_0_txt_mlp_2.lora_down.weight",
+    "lora_unet_double_blocks_0_txt_mlp_2.lora_up.weight",
+    "lora_unet_double_blocks_0_txt_mod_lin.alpha",
+    "lora_unet_double_blocks_0_txt_mod_lin.lora_down.weight",
+    "lora_unet_double_blocks_0_txt_mod_lin.lora_up.weight",
+    "lora_unet_double_blocks_10_img_attn_proj.alpha",
+    "lora_unet_double_blocks_10_img_attn_proj.lora_down.weight",
+    "lora_unet_double_blocks_10_img_attn_proj.lora_up.weight",
+    "lora_unet_double_blocks_10_img_attn_qkv.alpha",
+    "lora_unet_double_blocks_10_img_attn_qkv.lora_down.weight",
+    "lora_unet_double_blocks_10_img_attn_qkv.lora_up.weight",
+    "lora_unet_double_blocks_10_img_mlp_0.alpha",
+    "lora_unet_double_blocks_10_img_mlp_0.lora_down.weight",
+    "lora_unet_double_blocks_10_img_mlp_0.lora_up.weight",
+    "lora_unet_double_blocks_10_img_mlp_2.alpha",
+    "lora_unet_double_blocks_10_img_mlp_2.lora_down.weight",
+    "lora_unet_double_blocks_10_img_mlp_2.lora_up.weight",
+    "lora_unet_double_blocks_10_img_mod_lin.alpha",
+    "lora_unet_double_blocks_10_img_mod_lin.lora_down.weight",
+    "lora_unet_double_blocks_10_img_mod_lin.lora_up.weight",
+    "lora_unet_double_blocks_10_txt_attn_proj.alpha",
+    "lora_unet_double_blocks_10_txt_attn_proj.lora_down.weight",
+    "lora_unet_double_blocks_10_txt_attn_proj.lora_up.weight",
+    "lora_unet_double_blocks_10_txt_attn_qkv.alpha",
+    "lora_unet_double_blocks_10_txt_attn_qkv.lora_down.weight",
+    "lora_unet_double_blocks_10_txt_attn_qkv.lora_up.weight",
+    "lora_unet_double_blocks_10_txt_mlp_0.alpha",
+    "lora_unet_double_blocks_10_txt_mlp_0.lora_down.weight",
+    "lora_unet_double_blocks_10_txt_mlp_0.lora_up.weight",
+    "lora_unet_double_blocks_10_txt_mlp_2.alpha",
+    "lora_unet_double_blocks_10_txt_mlp_2.lora_down.weight",
+    "lora_unet_double_blocks_10_txt_mlp_2.lora_up.weight",
+    "lora_unet_double_blocks_10_txt_mod_lin.alpha",
+    "lora_unet_double_blocks_10_txt_mod_lin.lora_down.weight",
+    "lora_unet_double_blocks_10_txt_mod_lin.lora_up.weight",
+    "lora_unet_double_blocks_11_img_attn_proj.alpha",
+    "lora_unet_double_blocks_11_img_attn_proj.lora_down.weight",
+    "lora_unet_double_blocks_11_img_attn_proj.lora_up.weight",
+    "lora_unet_double_blocks_11_img_attn_qkv.alpha",
+    "lora_unet_double_blocks_11_img_attn_qkv.lora_down.weight",
+    "lora_unet_double_blocks_11_img_attn_qkv.lora_up.weight",
+    "lora_unet_double_blocks_11_img_mlp_0.alpha",
+    "lora_unet_double_blocks_11_img_mlp_0.lora_down.weight",
+    "lora_unet_double_blocks_11_img_mlp_0.lora_up.weight",
+    "lora_unet_double_blocks_11_img_mlp_2.alpha",
+    "lora_unet_double_blocks_11_img_mlp_2.lora_down.weight",
+    "lora_unet_double_blocks_11_img_mlp_2.lora_up.weight",
+    "lora_unet_double_blocks_11_img_mod_lin.alpha",
+    "lora_unet_double_blocks_11_img_mod_lin.lora_down.weight",
+    "lora_unet_double_blocks_11_img_mod_lin.lora_up.weight",
+    "lora_unet_double_blocks_11_txt_attn_proj.alpha",
+    "lora_unet_double_blocks_11_txt_attn_proj.lora_down.weight",
+    "lora_unet_double_blocks_11_txt_attn_proj.lora_up.weight",
+    "lora_unet_double_blocks_11_txt_attn_qkv.alpha",
+    "lora_unet_double_blocks_11_txt_attn_qkv.lora_down.weight",
+    "lora_unet_double_blocks_11_txt_attn_qkv.lora_up.weight",
+    "lora_unet_double_blocks_11_txt_mlp_0.alpha",
+    "lora_unet_double_blocks_11_txt_mlp_0.lora_down.weight",
+    "lora_unet_double_blocks_11_txt_mlp_0.lora_up.weight",
+    "lora_unet_double_blocks_11_txt_mlp_2.alpha",
+    "lora_unet_double_blocks_11_txt_mlp_2.lora_down.weight",
+    "lora_unet_double_blocks_11_txt_mlp_2.lora_up.weight",
+    "lora_unet_double_blocks_11_txt_mod_lin.alpha",
+    "lora_unet_double_blocks_11_txt_mod_lin.lora_down.weight",
+    "lora_unet_double_blocks_11_txt_mod_lin.lora_up.weight",
+    "lora_unet_double_blocks_12_img_attn_proj.alpha",
+    "lora_unet_double_blocks_12_img_attn_proj.lora_down.weight",
+    "lora_unet_double_blocks_12_img_attn_proj.lora_up.weight",
+    "lora_unet_double_blocks_12_img_attn_qkv.alpha",
+    "lora_unet_double_blocks_12_img_attn_qkv.lora_down.weight",
+    "lora_unet_double_blocks_12_img_attn_qkv.lora_up.weight",
+    "lora_unet_double_blocks_12_img_mlp_0.alpha",
+    "lora_unet_double_blocks_12_img_mlp_0.lora_down.weight",
+    "lora_unet_double_blocks_12_img_mlp_0.lora_up.weight",
+    "lora_unet_double_blocks_12_img_mlp_2.alpha",
+    "lora_unet_double_blocks_12_img_mlp_2.lora_down.weight",
+    "lora_unet_double_blocks_12_img_mlp_2.lora_up.weight",
+    "lora_unet_double_blocks_12_img_mod_lin.alpha",
+    "lora_unet_double_blocks_12_img_mod_lin.lora_down.weight",
+    "lora_unet_double_blocks_12_img_mod_lin.lora_up.weight",
+    "lora_unet_double_blocks_12_txt_attn_proj.alpha",
+    "lora_unet_double_blocks_12_txt_attn_proj.lora_down.weight",
+    "lora_unet_double_blocks_12_txt_attn_proj.lora_up.weight",
+    "lora_unet_double_blocks_12_txt_attn_qkv.alpha",
+    "lora_unet_double_blocks_12_txt_attn_qkv.lora_down.weight",
+    "lora_unet_double_blocks_12_txt_attn_qkv.lora_up.weight",
+    "lora_unet_double_blocks_12_txt_mlp_0.alpha",
+    "lora_unet_double_blocks_12_txt_mlp_0.lora_down.weight",
+    "lora_unet_double_blocks_12_txt_mlp_0.lora_up.weight",
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+    "lora_unet_single_blocks_20_linear2.lora_up.weight",
+    "lora_unet_single_blocks_20_modulation_lin.alpha",
+    "lora_unet_single_blocks_20_modulation_lin.lora_down.weight",
+    "lora_unet_single_blocks_20_modulation_lin.lora_up.weight",
+    "lora_unet_single_blocks_21_linear1.alpha",
+    "lora_unet_single_blocks_21_linear1.lora_down.weight",
+    "lora_unet_single_blocks_21_linear1.lora_up.weight",
+    "lora_unet_single_blocks_21_linear2.alpha",
+    "lora_unet_single_blocks_21_linear2.lora_down.weight",
+    "lora_unet_single_blocks_21_linear2.lora_up.weight",
+    "lora_unet_single_blocks_21_modulation_lin.alpha",
+    "lora_unet_single_blocks_21_modulation_lin.lora_down.weight",
+    "lora_unet_single_blocks_21_modulation_lin.lora_up.weight",
+    "lora_unet_single_blocks_22_linear1.alpha",
+    "lora_unet_single_blocks_22_linear1.lora_down.weight",
+    "lora_unet_single_blocks_22_linear1.lora_up.weight",
+    "lora_unet_single_blocks_22_linear2.alpha",
+    "lora_unet_single_blocks_22_linear2.lora_down.weight",
+    "lora_unet_single_blocks_22_linear2.lora_up.weight",
+    "lora_unet_single_blocks_22_modulation_lin.alpha",
+    "lora_unet_single_blocks_22_modulation_lin.lora_down.weight",
+    "lora_unet_single_blocks_22_modulation_lin.lora_up.weight",
+    "lora_unet_single_blocks_23_linear1.alpha",
+    "lora_unet_single_blocks_23_linear1.lora_down.weight",
+    "lora_unet_single_blocks_23_linear1.lora_up.weight",
+    "lora_unet_single_blocks_23_linear2.alpha",
+    "lora_unet_single_blocks_23_linear2.lora_down.weight",
+    "lora_unet_single_blocks_23_linear2.lora_up.weight",
+    "lora_unet_single_blocks_23_modulation_lin.alpha",
+    "lora_unet_single_blocks_23_modulation_lin.lora_down.weight",
+    "lora_unet_single_blocks_23_modulation_lin.lora_up.weight",
+    "lora_unet_single_blocks_24_linear1.alpha",
+    "lora_unet_single_blocks_24_linear1.lora_down.weight",
+    "lora_unet_single_blocks_24_linear1.lora_up.weight",
+    "lora_unet_single_blocks_24_linear2.alpha",
+    "lora_unet_single_blocks_24_linear2.lora_down.weight",
+    "lora_unet_single_blocks_24_linear2.lora_up.weight",
+    "lora_unet_single_blocks_24_modulation_lin.alpha",
+    "lora_unet_single_blocks_24_modulation_lin.lora_down.weight",
+    "lora_unet_single_blocks_24_modulation_lin.lora_up.weight",
+    "lora_unet_single_blocks_25_linear1.alpha",
+    "lora_unet_single_blocks_25_linear1.lora_down.weight",
+    "lora_unet_single_blocks_25_linear1.lora_up.weight",
+    "lora_unet_single_blocks_25_linear2.alpha",
+    "lora_unet_single_blocks_25_linear2.lora_down.weight",
+    "lora_unet_single_blocks_25_linear2.lora_up.weight",
+    "lora_unet_single_blocks_25_modulation_lin.alpha",
+    "lora_unet_single_blocks_25_modulation_lin.lora_down.weight",
+    "lora_unet_single_blocks_25_modulation_lin.lora_up.weight",
+    "lora_unet_single_blocks_26_linear1.alpha",
+    "lora_unet_single_blocks_26_linear1.lora_down.weight",
+    "lora_unet_single_blocks_26_linear1.lora_up.weight",
+    "lora_unet_single_blocks_26_linear2.alpha",
+    "lora_unet_single_blocks_26_linear2.lora_down.weight",
+    "lora_unet_single_blocks_26_linear2.lora_up.weight",
+    "lora_unet_single_blocks_26_modulation_lin.alpha",
+    "lora_unet_single_blocks_26_modulation_lin.lora_down.weight",
+    "lora_unet_single_blocks_26_modulation_lin.lora_up.weight",
+    "lora_unet_single_blocks_27_linear1.alpha",
+    "lora_unet_single_blocks_27_linear1.lora_down.weight",
+    "lora_unet_single_blocks_27_linear1.lora_up.weight",
+    "lora_unet_single_blocks_27_linear2.alpha",
+    "lora_unet_single_blocks_27_linear2.lora_down.weight",
+    "lora_unet_single_blocks_27_linear2.lora_up.weight",
+    "lora_unet_single_blocks_27_modulation_lin.alpha",
+    "lora_unet_single_blocks_27_modulation_lin.lora_down.weight",
+    "lora_unet_single_blocks_27_modulation_lin.lora_up.weight",
+    "lora_unet_single_blocks_28_linear1.alpha",
+    "lora_unet_single_blocks_28_linear1.lora_down.weight",
+    "lora_unet_single_blocks_28_linear1.lora_up.weight",
+    "lora_unet_single_blocks_28_linear2.alpha",
+    "lora_unet_single_blocks_28_linear2.lora_down.weight",
+    "lora_unet_single_blocks_28_linear2.lora_up.weight",
+    "lora_unet_single_blocks_28_modulation_lin.alpha",
+    "lora_unet_single_blocks_28_modulation_lin.lora_down.weight",
+    "lora_unet_single_blocks_28_modulation_lin.lora_up.weight",
+    "lora_unet_single_blocks_29_linear1.alpha",
+    "lora_unet_single_blocks_29_linear1.lora_down.weight",
+    "lora_unet_single_blocks_29_linear1.lora_up.weight",
+    "lora_unet_single_blocks_29_linear2.alpha",
+    "lora_unet_single_blocks_29_linear2.lora_down.weight",
+    "lora_unet_single_blocks_29_linear2.lora_up.weight",
+    "lora_unet_single_blocks_29_modulation_lin.alpha",
+    "lora_unet_single_blocks_29_modulation_lin.lora_down.weight",
+    "lora_unet_single_blocks_29_modulation_lin.lora_up.weight",
+    "lora_unet_single_blocks_2_linear1.alpha",
+    "lora_unet_single_blocks_2_linear1.lora_down.weight",
+    "lora_unet_single_blocks_2_linear1.lora_up.weight",
+    "lora_unet_single_blocks_2_linear2.alpha",
+    "lora_unet_single_blocks_2_linear2.lora_down.weight",
+    "lora_unet_single_blocks_2_linear2.lora_up.weight",
+    "lora_unet_single_blocks_2_modulation_lin.alpha",
+    "lora_unet_single_blocks_2_modulation_lin.lora_down.weight",
+    "lora_unet_single_blocks_2_modulation_lin.lora_up.weight",
+    "lora_unet_single_blocks_30_linear1.alpha",
+    "lora_unet_single_blocks_30_linear1.lora_down.weight",
+    "lora_unet_single_blocks_30_linear1.lora_up.weight",
+    "lora_unet_single_blocks_30_linear2.alpha",
+    "lora_unet_single_blocks_30_linear2.lora_down.weight",
+    "lora_unet_single_blocks_30_linear2.lora_up.weight",
+    "lora_unet_single_blocks_30_modulation_lin.alpha",
+    "lora_unet_single_blocks_30_modulation_lin.lora_down.weight",
+    "lora_unet_single_blocks_30_modulation_lin.lora_up.weight",
+    "lora_unet_single_blocks_31_linear1.alpha",
+    "lora_unet_single_blocks_31_linear1.lora_down.weight",
+    "lora_unet_single_blocks_31_linear1.lora_up.weight",
+    "lora_unet_single_blocks_31_linear2.alpha",
+    "lora_unet_single_blocks_31_linear2.lora_down.weight",
+    "lora_unet_single_blocks_31_linear2.lora_up.weight",
+    "lora_unet_single_blocks_31_modulation_lin.alpha",
+    "lora_unet_single_blocks_31_modulation_lin.lora_down.weight",
+    "lora_unet_single_blocks_31_modulation_lin.lora_up.weight",
+    "lora_unet_single_blocks_32_linear1.alpha",
+    "lora_unet_single_blocks_32_linear1.lora_down.weight",
+    "lora_unet_single_blocks_32_linear1.lora_up.weight",
+    "lora_unet_single_blocks_32_linear2.alpha",
+    "lora_unet_single_blocks_32_linear2.lora_down.weight",
+    "lora_unet_single_blocks_32_linear2.lora_up.weight",
+    "lora_unet_single_blocks_32_modulation_lin.alpha",
+    "lora_unet_single_blocks_32_modulation_lin.lora_down.weight",
+    "lora_unet_single_blocks_32_modulation_lin.lora_up.weight",
+    "lora_unet_single_blocks_33_linear1.alpha",
+    "lora_unet_single_blocks_33_linear1.lora_down.weight",
+    "lora_unet_single_blocks_33_linear1.lora_up.weight",
+    "lora_unet_single_blocks_33_linear2.alpha",
+    "lora_unet_single_blocks_33_linear2.lora_down.weight",
+    "lora_unet_single_blocks_33_linear2.lora_up.weight",
+    "lora_unet_single_blocks_33_modulation_lin.alpha",
+    "lora_unet_single_blocks_33_modulation_lin.lora_down.weight",
+    "lora_unet_single_blocks_33_modulation_lin.lora_up.weight",
+    "lora_unet_single_blocks_34_linear1.alpha",
+    "lora_unet_single_blocks_34_linear1.lora_down.weight",
+    "lora_unet_single_blocks_34_linear1.lora_up.weight",
+    "lora_unet_single_blocks_34_linear2.alpha",
+    "lora_unet_single_blocks_34_linear2.lora_down.weight",
+    "lora_unet_single_blocks_34_linear2.lora_up.weight",
+    "lora_unet_single_blocks_34_modulation_lin.alpha",
+    "lora_unet_single_blocks_34_modulation_lin.lora_down.weight",
+    "lora_unet_single_blocks_34_modulation_lin.lora_up.weight",
+    "lora_unet_single_blocks_35_linear1.alpha",
+    "lora_unet_single_blocks_35_linear1.lora_down.weight",
+    "lora_unet_single_blocks_35_linear1.lora_up.weight",
+    "lora_unet_single_blocks_35_linear2.alpha",
+    "lora_unet_single_blocks_35_linear2.lora_down.weight",
+    "lora_unet_single_blocks_35_linear2.lora_up.weight",
+    "lora_unet_single_blocks_35_modulation_lin.alpha",
+    "lora_unet_single_blocks_35_modulation_lin.lora_down.weight",
+    "lora_unet_single_blocks_35_modulation_lin.lora_up.weight",
+    "lora_unet_single_blocks_36_linear1.alpha",
+    "lora_unet_single_blocks_36_linear1.lora_down.weight",
+    "lora_unet_single_blocks_36_linear1.lora_up.weight",
+    "lora_unet_single_blocks_36_linear2.alpha",
+    "lora_unet_single_blocks_36_linear2.lora_down.weight",
+    "lora_unet_single_blocks_36_linear2.lora_up.weight",
+    "lora_unet_single_blocks_36_modulation_lin.alpha",
+    "lora_unet_single_blocks_36_modulation_lin.lora_down.weight",
+    "lora_unet_single_blocks_36_modulation_lin.lora_up.weight",
+    "lora_unet_single_blocks_37_linear1.alpha",
+    "lora_unet_single_blocks_37_linear1.lora_down.weight",
+    "lora_unet_single_blocks_37_linear1.lora_up.weight",
+    "lora_unet_single_blocks_37_linear2.alpha",
+    "lora_unet_single_blocks_37_linear2.lora_down.weight",
+    "lora_unet_single_blocks_37_linear2.lora_up.weight",
+    "lora_unet_single_blocks_37_modulation_lin.alpha",
+    "lora_unet_single_blocks_37_modulation_lin.lora_down.weight",
+    "lora_unet_single_blocks_37_modulation_lin.lora_up.weight",
+    "lora_unet_single_blocks_3_linear1.alpha",
+    "lora_unet_single_blocks_3_linear1.lora_down.weight",
+    "lora_unet_single_blocks_3_linear1.lora_up.weight",
+    "lora_unet_single_blocks_3_linear2.alpha",
+    "lora_unet_single_blocks_3_linear2.lora_down.weight",
+    "lora_unet_single_blocks_3_linear2.lora_up.weight",
+    "lora_unet_single_blocks_3_modulation_lin.alpha",
+    "lora_unet_single_blocks_3_modulation_lin.lora_down.weight",
+    "lora_unet_single_blocks_3_modulation_lin.lora_up.weight",
+    "lora_unet_single_blocks_4_linear1.alpha",
+    "lora_unet_single_blocks_4_linear1.lora_down.weight",
+    "lora_unet_single_blocks_4_linear1.lora_up.weight",
+    "lora_unet_single_blocks_4_linear2.alpha",
+    "lora_unet_single_blocks_4_linear2.lora_down.weight",
+    "lora_unet_single_blocks_4_linear2.lora_up.weight",
+    "lora_unet_single_blocks_4_modulation_lin.alpha",
+    "lora_unet_single_blocks_4_modulation_lin.lora_down.weight",
+    "lora_unet_single_blocks_4_modulation_lin.lora_up.weight",
+    "lora_unet_single_blocks_5_linear1.alpha",
+    "lora_unet_single_blocks_5_linear1.lora_down.weight",
+    "lora_unet_single_blocks_5_linear1.lora_up.weight",
+    "lora_unet_single_blocks_5_linear2.alpha",
+    "lora_unet_single_blocks_5_linear2.lora_down.weight",
+    "lora_unet_single_blocks_5_linear2.lora_up.weight",
+    "lora_unet_single_blocks_5_modulation_lin.alpha",
+    "lora_unet_single_blocks_5_modulation_lin.lora_down.weight",
+    "lora_unet_single_blocks_5_modulation_lin.lora_up.weight",
+    "lora_unet_single_blocks_6_linear1.alpha",
+    "lora_unet_single_blocks_6_linear1.lora_down.weight",
+    "lora_unet_single_blocks_6_linear1.lora_up.weight",
+    "lora_unet_single_blocks_6_linear2.alpha",
+    "lora_unet_single_blocks_6_linear2.lora_down.weight",
+    "lora_unet_single_blocks_6_linear2.lora_up.weight",
+    "lora_unet_single_blocks_6_modulation_lin.alpha",
+    "lora_unet_single_blocks_6_modulation_lin.lora_down.weight",
+    "lora_unet_single_blocks_6_modulation_lin.lora_up.weight",
+    "lora_unet_single_blocks_7_linear1.alpha",
+    "lora_unet_single_blocks_7_linear1.lora_down.weight",
+    "lora_unet_single_blocks_7_linear1.lora_up.weight",
+    "lora_unet_single_blocks_7_linear2.alpha",
+    "lora_unet_single_blocks_7_linear2.lora_down.weight",
+    "lora_unet_single_blocks_7_linear2.lora_up.weight",
+    "lora_unet_single_blocks_7_modulation_lin.alpha",
+    "lora_unet_single_blocks_7_modulation_lin.lora_down.weight",
+    "lora_unet_single_blocks_7_modulation_lin.lora_up.weight",
+    "lora_unet_single_blocks_8_linear1.alpha",
+    "lora_unet_single_blocks_8_linear1.lora_down.weight",
+    "lora_unet_single_blocks_8_linear1.lora_up.weight",
+    "lora_unet_single_blocks_8_linear2.alpha",
+    "lora_unet_single_blocks_8_linear2.lora_down.weight",
+    "lora_unet_single_blocks_8_linear2.lora_up.weight",
+    "lora_unet_single_blocks_8_modulation_lin.alpha",
+    "lora_unet_single_blocks_8_modulation_lin.lora_down.weight",
+    "lora_unet_single_blocks_8_modulation_lin.lora_up.weight",
+    "lora_unet_single_blocks_9_linear1.alpha",
+    "lora_unet_single_blocks_9_linear1.lora_down.weight",
+    "lora_unet_single_blocks_9_linear1.lora_up.weight",
+    "lora_unet_single_blocks_9_linear2.alpha",
+    "lora_unet_single_blocks_9_linear2.lora_down.weight",
+    "lora_unet_single_blocks_9_linear2.lora_up.weight",
+    "lora_unet_single_blocks_9_modulation_lin.alpha",
+    "lora_unet_single_blocks_9_modulation_lin.lora_down.weight",
+    "lora_unet_single_blocks_9_modulation_lin.lora_up.weight",
+]

tests/backend/peft/conversions/test_flux_lora_conversion_utils.py

@@ -0,0 +1,97 @@
+import pytest
+import torch
+
+from invokeai.backend.flux.model import Flux
+from invokeai.backend.flux.util import params
+from invokeai.backend.peft.conversions.flux_kohya_lora_conversion_utils import (
+    convert_flux_kohya_state_dict_to_invoke_format,
+    is_state_dict_likely_in_flux_kohya_format,
+    lora_model_from_flux_kohya_state_dict,
+)
+from tests.backend.peft.conversions.lora_state_dicts.flux_lora_kohya_format import state_dict_keys
+
+
+def test_is_state_dict_likely_in_flux_kohya_format_true():
+    """Test that is_state_dict_likely_in_flux_kohya_format() can identify a state dict in the Kohya FLUX LoRA format."""
+    # Construct a state dict that is in the Kohya FLUX LoRA format.
+    state_dict: dict[str, torch.Tensor] = {}
+    for k in state_dict_keys:
+        state_dict[k] = torch.empty(1)
+    assert is_state_dict_likely_in_flux_kohya_format(state_dict)
+
+
+def test_is_state_dict_likely_in_flux_kohya_format_false():
+    """Test that is_state_dict_likely_in_flux_kohya_format() returns False for a state dict that is not in the Kohya FLUX LoRA format."""
+    state_dict: dict[str, torch.Tensor] = {
+        "unexpected_key.lora_up.weight": torch.empty(1),
+    }
+    assert not is_state_dict_likely_in_flux_kohya_format(state_dict)
+
+
+def test_convert_flux_kohya_state_dict_to_invoke_format():
+    # Construct state_dict from state_dict_keys.
+    state_dict: dict[str, torch.Tensor] = {}
+    for k in state_dict_keys:
+        state_dict[k] = torch.empty(1)
+
+    converted_state_dict = convert_flux_kohya_state_dict_to_invoke_format(state_dict)
+
+    # Extract the prefixes from the converted state dict (i.e. without the .lora_up.weight, .lora_down.weight, and
+    # .alpha suffixes).
+    converted_key_prefixes: list[str] = []
+    for k in converted_state_dict.keys():
+        k = k.replace(".lora_up.weight", "")
+        k = k.replace(".lora_down.weight", "")
+        k = k.replace(".alpha", "")
+        converted_key_prefixes.append(k)
+
+    # Initialize a FLUX model on the meta device.
+    with torch.device("meta"):
+        model = Flux(params["flux-dev"])
+    model_keys = set(model.state_dict().keys())
+
+    # Assert that the converted state dict matches the keys in the actual model.
+    for converted_key_prefix in converted_key_prefixes:
+        found_match = False
+        for model_key in model_keys:
+            if model_key.startswith(converted_key_prefix):
+                found_match = True
+                break
+        if not found_match:
+            raise AssertionError(f"Could not find a match for the converted key prefix: {converted_key_prefix}")
+
+
+def test_convert_flux_kohya_state_dict_to_invoke_format_error():
+    """Test that an error is raised by convert_flux_kohya_state_dict_to_invoke_format() if the input state_dict contains
+    unexpected keys.
+    """
+    state_dict = {
+        "unexpected_key.lora_up.weight": torch.empty(1),
+    }
+
+    with pytest.raises(ValueError):
+        convert_flux_kohya_state_dict_to_invoke_format(state_dict)
+
+
+def test_lora_model_from_flux_kohya_state_dict():
+    """Test that a LoRAModelRaw can be created from a state dict in the Kohya FLUX LoRA format."""
+    # Construct state_dict from state_dict_keys.
+    state_dict: dict[str, torch.Tensor] = {}
+    for k in state_dict_keys:
+        state_dict[k] = torch.empty(1)
+
+    lora_model = lora_model_from_flux_kohya_state_dict(state_dict)
+
+    # Prepare expected layer keys.
+    expected_layer_keys: set[str] = set()
+    for k in state_dict_keys:
+        k = k.replace("lora_unet_", "")
+        k = k.replace(".lora_up.weight", "")
+        k = k.replace(".lora_down.weight", "")
+        k = k.replace(".alpha", "")
+        expected_layer_keys.add(k)
+
+    # Assert that the lora_model has the expected layers.
+    lora_model_keys = set(lora_model.layers.keys())
+    lora_model_keys = {k.replace(".", "_") for k in lora_model_keys}
+    assert lora_model_keys == expected_layer_keys