[LoRA] fix: animate diff lora stuff. (#8995)

* fix: animate diff lora stuff.

* fix scaling function for UNetMotionModel

* emoty

Author: sayakpaul

src/diffusers/loaders/peft.py

@@ -30,6 +30,7 @@
 
 _SET_ADAPTER_SCALE_FN_MAPPING = {
     "UNet2DConditionModel": _maybe_expand_lora_scales,
+    "UNetMotionModel": _maybe_expand_lora_scales,
     "SD3Transformer2DModel": lambda model_cls, weights: weights,
 }
 

src/diffusers/models/unets/unet_motion_model.py

@@ -19,7 +19,7 @@
 import torch.utils.checkpoint
 
 from ...configuration_utils import ConfigMixin, FrozenDict, register_to_config
-from ...loaders import FromOriginalModelMixin, UNet2DConditionLoadersMixin
+from ...loaders import FromOriginalModelMixin, PeftAdapterMixin, UNet2DConditionLoadersMixin
 from ...utils import logging
 from ..attention_processor import (
     ADDED_KV_ATTENTION_PROCESSORS,
@@ -231,7 +231,7 @@ def forward(self, sample):
         pass
 
 
-class UNetMotionModel(ModelMixin, ConfigMixin, UNet2DConditionLoadersMixin):
+class UNetMotionModel(ModelMixin, ConfigMixin, UNet2DConditionLoadersMixin, PeftAdapterMixin):
     r"""
     A modified conditional 2D UNet model that takes a noisy sample, conditional state, and a timestep and returns a
     sample shaped output.