langchain PyPDF2 python-dotenv streamlit openai==0.27.6 faiss-cpu==1.7.4 altair==4 tiktoken==0.4.0 # uncomment to use huggingface llms huggingface-hub==0.14.1 streamlit python-dotenv PyPDF2 langchain pytesseract Pillow # This is a dependency for pytesseract PyMuPDF python-docx streamlit-chat # uncomment to use instructor embeddings InstructorEmbedding==1.0.1 # sentence-transformers==2.2.2