sentence-transformers transformers llama-index==0.10.47 llama-index-embeddings-huggingface==0.2.1 llama-index-embeddings-instructor==0.1.3 llama-index-vector-stores-faiss==0.1.2 llama-index-retrievers-bm25==0.1.4 numpy==1.23 scipy==1.8.0 watchdog faiss-cpu