diff --git a/invokeai/backend/stable_diffusion/diffusers_pipeline.py b/invokeai/backend/stable_diffusion/diffusers_pipeline.py
index 6268af369f..98c3c22423 100644
--- a/invokeai/backend/stable_diffusion/diffusers_pipeline.py
+++ b/invokeai/backend/stable_diffusion/diffusers_pipeline.py
@@ -5,7 +5,7 @@ import inspect
 import math
 import secrets
 from dataclasses import dataclass, field
-from typing import Any, Callable, Generic, List, Optional, Type, TypeVar, Union
+from typing import Any, Callable, Generic, List, Optional, Type, Union
 
 import PIL.Image
 import einops
@@ -27,7 +27,6 @@ from diffusers.utils.import_utils import is_xformers_available
 from diffusers.utils.outputs import BaseOutput
 from pydantic import Field
 from transformers import CLIPFeatureExtractor, CLIPTextModel, CLIPTokenizer
-from typing_extensions import ParamSpec
 
 from invokeai.app.services.config import InvokeAIAppConfig
 from .diffusion import (
@@ -161,33 +160,6 @@ def is_inpainting_model(unet: UNet2DConditionModel):
     return unet.conv_in.in_channels == 9
 
 
-CallbackType = TypeVar("CallbackType")
-ReturnType = TypeVar("ReturnType")
-ParamType = ParamSpec("ParamType")
-
-
-@dataclass(frozen=True)
-class GeneratorToCallbackinator(Generic[ParamType, ReturnType, CallbackType]):
-    """Convert a generator to a function with a callback and a return value."""
-
-    generator_method: Callable[ParamType, ReturnType]
-    callback_arg_type: Type[CallbackType]
-
-    def __call__(
-        self,
-        *args: ParamType.args,
-        callback: Callable[[CallbackType], Any] = None,
-        **kwargs: ParamType.kwargs,
-    ) -> ReturnType:
-        result = None
-        for result in self.generator_method(*args, **kwargs):
-            if callback is not None and isinstance(result, self.callback_arg_type):
-                callback(result)
-        if result is None:
-            raise AssertionError("why was that an empty generator?")
-        return result
-
-
 @dataclass
 class ControlNetData:
     model: ControlNetModel = Field(default=None)
@@ -375,10 +347,6 @@ class StableDiffusionGeneratorPipeline(StableDiffusionPipeline):
         if init_timestep.shape[0] == 0:
             return latents, None
 
-        infer_latents_from_embeddings = GeneratorToCallbackinator(
-            self.generate_latents_from_embeddings, PipelineIntermediateState
-        )
-
         if additional_guidance is None:
             additional_guidance = []
 
@@ -417,7 +385,7 @@ class StableDiffusionGeneratorPipeline(StableDiffusionPipeline):
                 additional_guidance.append(AddsMaskGuidance(mask, orig_latents, self.scheduler, noise))
 
         try:
-            result: PipelineIntermediateState = infer_latents_from_embeddings(
+            latents, attention_map_saver = self.generate_latents_from_embeddings(
                 latents,
                 timesteps,
                 conditioning_data,
@@ -428,13 +396,11 @@ class StableDiffusionGeneratorPipeline(StableDiffusionPipeline):
         finally:
             self.invokeai_diffuser.model_forward_callback = self._unet_forward
 
-        latents = result.latents
-
         # restore unmasked part
         if mask is not None:
             latents = torch.lerp(orig_latents, latents.to(dtype=orig_latents.dtype), mask.to(dtype=orig_latents.dtype))
 
-        return latents, result.attention_map_saver
+        return latents, attention_map_saver
 
     def generate_latents_from_embeddings(
         self,
@@ -444,6 +410,7 @@ class StableDiffusionGeneratorPipeline(StableDiffusionPipeline):
         *,
         additional_guidance: List[Callable] = None,
         control_data: List[ControlNetData] = None,
+        callback: Callable[[PipelineIntermediateState], None] = None,
     ):
         self._adjust_memory_efficient_attention(latents)
         if additional_guidance is None:
@@ -461,13 +428,14 @@ class StableDiffusionGeneratorPipeline(StableDiffusionPipeline):
             extra_conditioning_info=extra_conditioning_info,
             step_count=len(self.scheduler.timesteps),
         ):
-            yield PipelineIntermediateState(
-                step=-1,
-                order=self.scheduler.order,
-                total_steps=len(timesteps),
-                timestep=self.scheduler.config.num_train_timesteps,
-                latents=latents,
-            )
+            if callback is not None:
+                callback(PipelineIntermediateState(
+                    step=-1,
+                    order=self.scheduler.order,
+                    total_steps=len(timesteps),
+                    timestep=self.scheduler.config.num_train_timesteps,
+                    latents=latents,
+                ))
 
             # print("timesteps:", timesteps)
             for i, t in enumerate(self.progress_bar(timesteps)):
@@ -500,15 +468,16 @@ class StableDiffusionGeneratorPipeline(StableDiffusionPipeline):
                 #    attention_map_saver = AttentionMapSaver(token_ids=attention_map_token_ids, latents_shape=latents.shape[-2:])
                 #    self.invokeai_diffuser.setup_attention_map_saving(attention_map_saver)
 
-                yield PipelineIntermediateState(
-                    step=i,
-                    order=self.scheduler.order,
-                    total_steps=len(timesteps),
-                    timestep=int(t),
-                    latents=latents,
-                    predicted_original=predicted_original,
-                    attention_map_saver=attention_map_saver,
-                )
+                if callback is not None:
+                    callback(PipelineIntermediateState(
+                        step=i,
+                        order=self.scheduler.order,
+                        total_steps=len(timesteps),
+                        timestep=int(t),
+                        latents=latents,
+                        predicted_original=predicted_original,
+                        attention_map_saver=attention_map_saver,
+                    ))
 
             return latents, attention_map_saver