pymupdf #llama-index sentence-transformers chromadb st-annotated-text #rank-bm25 langchain huggingface_hub openai #openai==0.28 FlagEmbedding https://huggingface.co/spacy/en_core_web_md/resolve/main/en_core_web_md-any-py3-none-any.whl tiktoken rank_bm25 #faiss-cpu