🔧 Fix Dependency Issues

If you're seeing the transformers error, follow these steps:

Quick Fix

Run these commands in order:

# 1. Uninstall conflicting packages
pip uninstall -y transformers diffusers

# 2. Install compatible versions
pip install transformers==4.44.2
pip install diffusers==0.30.3
pip install sentencepiece
pip install protobuf

# 3. Restart the backend
python backend_local.py

Full Clean Install

If the quick fix doesn't work, do a complete reinstall:

# 1. Create a fresh virtual environment
python3 -m venv venv_clean
source venv_clean/bin/activate  # On Windows: venv_clean\Scripts\activate

# 2. Install PyTorch first (GPU version)
pip install torch torchvision torchaudio --index-url https://download.pytorch.org/whl/cu118

# Or for CPU only:
# pip install torch torchvision torchaudio

# 3. Install all requirements
pip install -r requirements_local.txt

# 4. Run the backend
python backend_local.py

What Was the Problem?

The error occurred because:

Old transformers version didn't have the correct T5 tokenizer loading methods
Missing sentencepiece library (required for T5 tokenizer)
Incompatible diffusers version with the transformers library

Verified Working Versions

These versions are tested and working:

transformers>=4.44.0
diffusers>=0.30.0
sentencepiece>=0.1.99
protobuf>=3.20.0

Still Having Issues?

Try this diagnostic:

# Test if transformers is working
python -c "from transformers import T5Tokenizer; print('✅ Transformers OK')"

# Test if diffusers is working
python -c "from diffusers import CogVideoXPipeline; print('✅ Diffusers OK')"

If either fails, reinstall that specific package:

pip install --upgrade --force-reinstall transformers
pip install --upgrade --force-reinstall diffusers

After fixing, restart the backend and it should work! 🎉