Comprehensive type checking for from_pretrained kwargs

src/diffusers/pipelines/animatediff/pipeline_animatediff_video2video.py

@@ -224,7 +224,7 @@ def __init__(
         vae: AutoencoderKL,
         text_encoder: CLIPTextModel,
         tokenizer: CLIPTokenizer,
-        unet: UNet2DConditionModel,
+        unet: Union[UNet2DConditionModel, UNetMotionModel],
         motion_adapter: MotionAdapter,
         scheduler: Union[
             DDIMScheduler,

src/diffusers/pipelines/animatediff/pipeline_animatediff_video2video_controlnet.py

@@ -246,7 +246,7 @@ def __init__(
         vae: AutoencoderKL,
         text_encoder: CLIPTextModel,
         tokenizer: CLIPTokenizer,
-        unet: UNet2DConditionModel,
+        unet: Union[UNet2DConditionModel, UNetMotionModel],
         motion_adapter: MotionAdapter,
         controlnet: Union[ControlNetModel, List[ControlNetModel], Tuple[ControlNetModel], MultiControlNetModel],
         scheduler: Union[

src/diffusers/pipelines/controlnet_hunyuandit/pipeline_hunyuandit_controlnet.py

@@ -232,8 +232,8 @@ def __init__(
             Tuple[HunyuanDiT2DControlNetModel],
             HunyuanDiT2DMultiControlNetModel,
         ],
-        text_encoder_2=T5EncoderModel,
-        tokenizer_2=MT5Tokenizer,
+        text_encoder_2: Optional[T5EncoderModel] = None,
+        tokenizer_2: Optional[MT5Tokenizer] = None,
         requires_safety_checker: bool = True,
     ):
         super().__init__()

src/diffusers/pipelines/controlnet_sd3/pipeline_stable_diffusion_3_controlnet.py

@@ -17,10 +17,10 @@
 
 import torch
 from transformers import (
-    BaseImageProcessor,
     CLIPTextModelWithProjection,
     CLIPTokenizer,
-    PreTrainedModel,
+    SiglipImageProcessor,
+    SiglipVisionModel,
     T5EncoderModel,
     T5TokenizerFast,
 )
@@ -178,9 +178,9 @@ class StableDiffusion3ControlNetPipeline(
             Provides additional conditioning to the `unet` during the denoising process. If you set multiple
             ControlNets as a list, the outputs from each ControlNet are added together to create one combined
             additional conditioning.
-        image_encoder (`PreTrainedModel`, *optional*):
+        image_encoder (`SiglipVisionModel`, *optional*):
             Pre-trained Vision Model for IP Adapter.
-        feature_extractor (`BaseImageProcessor`, *optional*):
+        feature_extractor (`SiglipImageProcessor`, *optional*):
             Image processor for IP Adapter.
     """
 
@@ -202,8 +202,8 @@ def __init__(
         controlnet: Union[
             SD3ControlNetModel, List[SD3ControlNetModel], Tuple[SD3ControlNetModel], SD3MultiControlNetModel
         ],
-        image_encoder: PreTrainedModel = None,
-        feature_extractor: BaseImageProcessor = None,
+        image_encoder: Optional[SiglipVisionModel] = None,
+        feature_extractor: Optional[SiglipImageProcessor] = None,
     ):
         super().__init__()
         if isinstance(controlnet, (list, tuple)):

src/diffusers/pipelines/controlnet_sd3/pipeline_stable_diffusion_3_controlnet_inpainting.py

@@ -17,10 +17,10 @@
 
 import torch
 from transformers import (
-    BaseImageProcessor,
     CLIPTextModelWithProjection,
     CLIPTokenizer,
-    PreTrainedModel,
+    SiglipImageProcessor,
+    SiglipModel,
     T5EncoderModel,
     T5TokenizerFast,
 )
@@ -223,8 +223,8 @@ def __init__(
         controlnet: Union[
             SD3ControlNetModel, List[SD3ControlNetModel], Tuple[SD3ControlNetModel], SD3MultiControlNetModel
         ],
-        image_encoder: PreTrainedModel = None,
-        feature_extractor: BaseImageProcessor = None,
+        image_encoder: SiglipModel = None,
+        feature_extractor: Optional[SiglipImageProcessor] = None,
     ):
         super().__init__()
 

src/diffusers/pipelines/dance_diffusion/pipeline_dance_diffusion.py

@@ -17,6 +17,8 @@
 
 import torch
 
+from ...models import UNet1DModel
+from ...schedulers import SchedulerMixin
 from ...utils import is_torch_xla_available, logging
 from ...utils.torch_utils import randn_tensor
 from ..pipeline_utils import AudioPipelineOutput, DiffusionPipeline
@@ -49,7 +51,7 @@ class DanceDiffusionPipeline(DiffusionPipeline):
 
     model_cpu_offload_seq = "unet"
 
-    def __init__(self, unet, scheduler):
+    def __init__(self, unet: UNet1DModel, scheduler: SchedulerMixin):
         super().__init__()
         self.register_modules(unet=unet, scheduler=scheduler)
 

src/diffusers/pipelines/ddim/pipeline_ddim.py

@@ -16,6 +16,7 @@
 
 import torch
 
+from ...models import UNet2DModel
 from ...schedulers import DDIMScheduler
 from ...utils import is_torch_xla_available
 from ...utils.torch_utils import randn_tensor
@@ -47,7 +48,7 @@ class DDIMPipeline(DiffusionPipeline):
 
     model_cpu_offload_seq = "unet"
 
-    def __init__(self, unet, scheduler):
+    def __init__(self, unet: UNet2DModel, scheduler: DDIMScheduler):
         super().__init__()
 
         # make sure scheduler can always be converted to DDIM

src/diffusers/pipelines/ddpm/pipeline_ddpm.py

@@ -17,6 +17,8 @@
 
 import torch
 
+from ...models import UNet2DModel
+from ...schedulers import DDPMScheduler
 from ...utils import is_torch_xla_available
 from ...utils.torch_utils import randn_tensor
 from ..pipeline_utils import DiffusionPipeline, ImagePipelineOutput
@@ -47,7 +49,7 @@ class DDPMPipeline(DiffusionPipeline):
 
     model_cpu_offload_seq = "unet"
 
-    def __init__(self, unet, scheduler):
+    def __init__(self, unet: UNet2DModel, scheduler: DDPMScheduler):
         super().__init__()
         self.register_modules(unet=unet, scheduler=scheduler)
 

src/diffusers/pipelines/deprecated/repaint/pipeline_repaint.py

@@ -91,7 +91,7 @@ class RePaintPipeline(DiffusionPipeline):
     scheduler: RePaintScheduler
     model_cpu_offload_seq = "unet"
 
-    def __init__(self, unet, scheduler):
+    def __init__(self, unet: UNet2DModel, scheduler: RePaintScheduler):
         super().__init__()
         self.register_modules(unet=unet, scheduler=scheduler)
 

src/diffusers/pipelines/hunyuandit/pipeline_hunyuandit.py

@@ -207,8 +207,8 @@ def __init__(
         safety_checker: StableDiffusionSafetyChecker,
         feature_extractor: CLIPImageProcessor,
         requires_safety_checker: bool = True,
-        text_encoder_2=T5EncoderModel,
-        tokenizer_2=MT5Tokenizer,
+        text_encoder_2: Optional[T5EncoderModel] = None,
+        tokenizer_2: Optional[MT5Tokenizer] = None,
     ):
         super().__init__()
 

src/diffusers/pipelines/lumina/pipeline_lumina.py

@@ -20,7 +20,7 @@
 from typing import Callable, Dict, List, Optional, Tuple, Union
 
 import torch
-from transformers import AutoModel, AutoTokenizer
+from transformers import GemmaPreTrainedModel, GemmaTokenizer, GemmaTokenizerFast
 
 from ...callbacks import MultiPipelineCallbacks, PipelineCallback
 from ...image_processor import VaeImageProcessor
@@ -144,13 +144,10 @@ class LuminaText2ImgPipeline(DiffusionPipeline):
     Args:
         vae ([`AutoencoderKL`]):
             Variational Auto-Encoder (VAE) Model to encode and decode images to and from latent representations.
-        text_encoder ([`AutoModel`]):
-            Frozen text-encoder. Lumina-T2I uses
-            [T5](https://huggingface.co/docs/transformers/model_doc/t5#transformers.AutoModel), specifically the
-            [t5-v1_1-xxl](https://huggingface.co/Alpha-VLLM/tree/main/t5-v1_1-xxl) variant.
-        tokenizer (`AutoModel`):
-            Tokenizer of class
-            [AutoModel](https://huggingface.co/docs/transformers/model_doc/t5#transformers.AutoModel).
+        text_encoder ([`GemmaPreTrainedModel`]):
+            Frozen Gemma text-encoder.
+        tokenizer (`GemmaTokenizer` or `GemmaTokenizerFast`):
+            Gemma tokenizer.
         transformer ([`Transformer2DModel`]):
             A text conditioned `Transformer2DModel` to denoise the encoded image latents.
         scheduler ([`SchedulerMixin`]):
@@ -185,8 +182,8 @@ def __init__(
         transformer: LuminaNextDiT2DModel,
         scheduler: FlowMatchEulerDiscreteScheduler,
         vae: AutoencoderKL,
-        text_encoder: AutoModel,
-        tokenizer: AutoTokenizer,
+        text_encoder: GemmaPreTrainedModel,
+        tokenizer: Union[GemmaTokenizer, GemmaTokenizerFast],
     ):
         super().__init__()
 

src/diffusers/pipelines/lumina2/pipeline_lumina2.py

@@ -17,7 +17,7 @@
 
 import numpy as np
 import torch
-from transformers import AutoModel, AutoTokenizer
+from transformers import Gemma2PreTrainedModel, GemmaTokenizer, GemmaTokenizerFast
 
 from ...image_processor import VaeImageProcessor
 from ...loaders import Lumina2LoraLoaderMixin
@@ -143,13 +143,10 @@ class Lumina2Text2ImgPipeline(DiffusionPipeline, Lumina2LoraLoaderMixin):
     Args:
         vae ([`AutoencoderKL`]):
             Variational Auto-Encoder (VAE) Model to encode and decode images to and from latent representations.
-        text_encoder ([`AutoModel`]):
-            Frozen text-encoder. Lumina-T2I uses
-            [T5](https://huggingface.co/docs/transformers/model_doc/t5#transformers.AutoModel), specifically the
-            [t5-v1_1-xxl](https://huggingface.co/Alpha-VLLM/tree/main/t5-v1_1-xxl) variant.
-        tokenizer (`AutoModel`):
-            Tokenizer of class
-            [AutoModel](https://huggingface.co/docs/transformers/model_doc/t5#transformers.AutoModel).
+        text_encoder ([`Gemma2PreTrainedModel`]):
+            Frozen Gemma2 text-encoder.
+        tokenizer (`GemmaTokenizer` or `GemmaTokenizerFast`):
+            Gemma tokenizer.
         transformer ([`Transformer2DModel`]):
             A text conditioned `Transformer2DModel` to denoise the encoded image latents.
         scheduler ([`SchedulerMixin`]):
@@ -165,8 +162,8 @@ def __init__(
         transformer: Lumina2Transformer2DModel,
         scheduler: FlowMatchEulerDiscreteScheduler,
         vae: AutoencoderKL,
-        text_encoder: AutoModel,
-        tokenizer: AutoTokenizer,
+        text_encoder: Gemma2PreTrainedModel,
+        tokenizer: Union[GemmaTokenizer, GemmaTokenizerFast],
     ):
         super().__init__()
 

src/diffusers/pipelines/pag/pipeline_pag_sana.py

@@ -20,7 +20,7 @@
 from typing import Callable, Dict, List, Optional, Tuple, Union
 
 import torch
-from transformers import AutoModelForCausalLM, AutoTokenizer
+from transformers import Gemma2PreTrainedModel, GemmaTokenizer, GemmaTokenizerFast
 
 from ...callbacks import MultiPipelineCallbacks, PipelineCallback
 from ...image_processor import PixArtImageProcessor
@@ -160,8 +160,8 @@ class SanaPAGPipeline(DiffusionPipeline, PAGMixin):
 
     def __init__(
         self,
-        tokenizer: AutoTokenizer,
-        text_encoder: AutoModelForCausalLM,
+        tokenizer: Union[GemmaTokenizer, GemmaTokenizerFast],
+        text_encoder: Gemma2PreTrainedModel,
         vae: AutoencoderDC,
         transformer: SanaTransformer2DModel,
         scheduler: FlowMatchEulerDiscreteScheduler,

src/diffusers/pipelines/pipeline_loading_utils.py

@@ -17,7 +17,7 @@
 import re
 import warnings
 from pathlib import Path
-from typing import Any, Callable, Dict, List, Optional, Union
+from typing import Any, Callable, Dict, List, Optional, Set, Tuple, Type, Union, get_args, get_origin
 
 import requests
 import torch
@@ -1059,3 +1059,76 @@ def _maybe_raise_error_for_incorrect_transformers(config_dict):
                 break
     if has_transformers_component and not is_transformers_version(">", "4.47.1"):
         raise ValueError("Please upgrade your `transformers` installation to the latest version to use DDUF.")
+
+
+def _is_valid_type(obj: Any, class_or_tuple: Union[Type, Tuple[Type, ...]]) -> bool:
+    """
+    Checks if an object is an instance of any of the provided types. For collections, it checks if every element is of
+    the correct type as well.
+    """
+    if not isinstance(class_or_tuple, tuple):
+        class_or_tuple = (class_or_tuple,)
+
+    # Unpack unions
+    unpacked_class_or_tuple = []
+    for t in class_or_tuple:
+        if get_origin(t) is Union:
+            unpacked_class_or_tuple.extend(get_args(t))
+        else:
+            unpacked_class_or_tuple.append(t)
+    class_or_tuple = tuple(unpacked_class_or_tuple)
+
+    if Any in class_or_tuple:
+        return True
+
+    obj_type = type(obj)
+    # Classes with obj's type
+    class_or_tuple = {t for t in class_or_tuple if isinstance(obj, get_origin(t) or t)}
+
+    # Singular types (e.g. int, ControlNet, ...)
+    # Untyped collections (e.g. List, but not List[int])
+    elem_class_or_tuple = {get_args(t) for t in class_or_tuple}
+    if () in elem_class_or_tuple:
+        return True
+    # Typed lists or sets
+    elif obj_type in (list, set):
+        return any(all(_is_valid_type(x, t) for x in obj) for t in elem_class_or_tuple)
+    # Typed tuples
+    elif obj_type is tuple:
+        return any(
+            # Tuples with any length and single type (e.g. Tuple[int, ...])
+            (len(t) == 2 and t[-1] is Ellipsis and all(_is_valid_type(x, t[0]) for x in obj))
+            or
+            # Tuples with fixed length and any types (e.g. Tuple[int, str])
+            (len(obj) == len(t) and all(_is_valid_type(x, tt) for x, tt in zip(obj, t)))
+            for t in elem_class_or_tuple
+        )
+    # Typed dicts
+    elif obj_type is dict:
+        return any(
+            all(_is_valid_type(k, kt) and _is_valid_type(v, vt) for k, v in obj.items())
+            for kt, vt in elem_class_or_tuple
+        )
+
+    else:
+        return False
+
+
+def _get_detailed_type(obj: Any) -> Type:
+    """
+    Gets a detailed type for an object, including nested types for collections.
+    """
+    obj_type = type(obj)
+
+    if obj_type in (list, set):
+        obj_origin_type = List if obj_type is list else Set
+        elems_type = Union[tuple({_get_detailed_type(x) for x in obj})]
+        return obj_origin_type[elems_type]
+    elif obj_type is tuple:
+        return Tuple[tuple(_get_detailed_type(x) for x in obj)]
+    elif obj_type is dict:
+        keys_type = Union[tuple({_get_detailed_type(k) for k in obj.keys()})]
+        values_type = Union[tuple({_get_detailed_type(k) for k in obj.values()})]
+        return Dict[keys_type, values_type]
+    else:
+        return obj_type