requirements.txt

# Gradio UI
gradio>=3.0

# Dense embeddings
sentence-transformers>=2.2.2
torch>=1.12.0

# Sparse BM25
rank_bm25>=0.2.2

# Late-interaction (ColBERT)
transformers>=4.26.0
colbert-py>=1.0.0         # or replace with your ColBERT package name/version

# (Optional) HF hub support
huggingface-hub>=0.13.0