langchain PyPDF2==3.0.1 python-dotenv==1.0.0 streamlit==1.18.1 openai==0.27.6 faiss-cpu==1.7.4 altair==4 tiktoken==0.4.0 pydantic==2.6.4 # uncomment to use huggingface llms huggingface-hub==0.14.1 # uncomment to use instructor embeddings # InstructorEmbedding==1.0.1 sentence-transformers==2.2.2