langchain ipykernel python-dotenv langchain-community pypdf bs4 arxiv pymupdf wikipedia pyowm langchain-text-splitters langchain-openai chromadb sentence-transformers langchain-huggingface faiss-cpu langchain-chroma streamlit langchain-groq langchain-core fastapi uvicorn langserve sse_starlette duckduckgo-search SQLAlchemy mysql-connector-python validators==0.28.1 youtube-transcript-api unstructured pytube numexpr huggingface_hub