streamlit python-dotenv langchain==1.2.4 langchain-community==0.4.1 langchain-core==1.2.7 langchain-text-splitters==1.1.0 langchain-huggingface huggingface_hub pypdf==6.6.0 #chromadb==1.4.1 sentence-transformers==5.2.0 langchain-chroma torch transformers==4.57.6