Fix diffusers compatibility: handle renamed modules

[Mr-Neutr0n]

Summary

• Fixed compatibility with newer diffusers versions (0.21+) where several modules were renamed/moved

Problem

In newer diffusers versions:

• diffusers.modeling_utils.ModelMixin was moved to diffusers.models.modeling_utils.ModelMixin
• diffusers.models.attention.CrossAttention was renamed to diffusers.models.attention_processor.Attention

This causes ModuleNotFoundError when using newer diffusers installations.

Solution

Added try/except blocks to handle both old and new import paths:

try:
    from diffusers.modeling_utils import ModelMixin
except ImportError:
    from diffusers.models.modeling_utils import ModelMixin

Files Modified

• animatediff/models/motion_module.py
• animatediff/models/unet.py
• animatediff/models/attention.py
• animatediff/models/sparse_controlnet.py

Related Issue

Fixes #415

Test Plan

• Works with older diffusers versions (< 0.21)
• Works with newer diffusers versions (>= 0.21)

[Mr-Neutr0n]

hi, following up — this fixes a broken import after diffusers restructured its modules. without it the pipeline can't load. let me know your thoughts