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69 lines
2.8 KiB
Python
69 lines
2.8 KiB
Python
# Copyright (c) 2024, Lincoln D. Stein and the InvokeAI Development Team
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"""Class for VAE model loading in InvokeAI."""
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from pathlib import Path
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import torch
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from omegaconf import DictConfig, OmegaConf
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from safetensors.torch import load_file as safetensors_load_file
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from invokeai.backend.model_manager import (
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AnyModelConfig,
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BaseModelType,
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ModelFormat,
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ModelType,
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)
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from invokeai.backend.model_manager.config import CheckpointConfigBase
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from invokeai.backend.model_manager.convert_ckpt_to_diffusers import convert_ldm_vae_to_diffusers
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from .. import ModelLoaderRegistry
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from .generic_diffusers import GenericDiffusersLoader
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@ModelLoaderRegistry.register(base=BaseModelType.Any, type=ModelType.VAE, format=ModelFormat.Diffusers)
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@ModelLoaderRegistry.register(base=BaseModelType.StableDiffusion1, type=ModelType.VAE, format=ModelFormat.Checkpoint)
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@ModelLoaderRegistry.register(base=BaseModelType.StableDiffusion2, type=ModelType.VAE, format=ModelFormat.Checkpoint)
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class VAELoader(GenericDiffusersLoader):
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"""Class to load VAE models."""
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def _needs_conversion(self, config: AnyModelConfig, model_path: Path, dest_path: Path) -> bool:
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if not isinstance(config, CheckpointConfigBase):
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return False
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elif (
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dest_path.exists()
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and (dest_path / "config.json").stat().st_mtime >= (config.converted_at or 0.0)
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and (dest_path / "config.json").stat().st_mtime >= model_path.stat().st_mtime
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):
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return False
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else:
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return True
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def _convert_model(self, config: AnyModelConfig, model_path: Path, output_path: Path) -> Path:
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# TODO(MM2): check whether sdxl VAE models convert.
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if config.base not in {BaseModelType.StableDiffusion1, BaseModelType.StableDiffusion2}:
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raise Exception(f"VAE conversion not supported for model type: {config.base}")
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else:
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assert isinstance(config, CheckpointConfigBase)
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config_file = config.config_path
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if model_path.suffix == ".safetensors":
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checkpoint = safetensors_load_file(model_path, device="cpu")
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else:
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checkpoint = torch.load(model_path, map_location="cpu")
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# sometimes weights are hidden under "state_dict", and sometimes not
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if "state_dict" in checkpoint:
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checkpoint = checkpoint["state_dict"]
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ckpt_config = OmegaConf.load(self._app_config.root_path / config_file)
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assert isinstance(ckpt_config, DictConfig)
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vae_model = convert_ldm_vae_to_diffusers(
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checkpoint=checkpoint,
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vae_config=ckpt_config,
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image_size=512,
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)
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vae_model.to(self._torch_dtype) # set precision appropriately
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vae_model.save_pretrained(output_path, safe_serialization=True)
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return output_path
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