langchain langchain-community beautifulsoup4 pandas transformers==4.34.0 llama-cpp-python --extra-index-url https://abetlen.github.io/llama-cpp-python/whl/cpu torch sentence_transformers==2.2.2 faiss-cpu==1.7.4 pypdf python-docx keybert span_marker gensim gradio==3.50.2 gradio_client nltk scipy<1.13