langchain==0.1.5 PyPDF2==3.0.1 python-dotenv==1.0.0 streamlit==1.18.1 faiss-cpu==1.7.4 altair==4 tiktoken==0.4.0 sentence-transformers==2.2.2 pydantic == 1.7.4 fastapi == 0.109.2 InstructorEmbedding==1.0.1