openai==0.28 tiktoken==0.4.0 langchain==0.0.259 PyPDF2==3.0.1 pdf2image gradio torch pypdf git+https://github.com/huggingface/transformers.git@21f6f58721dd9154357576be6de54eefef1f1818 git+https://github.com/impira/docquery.git@8d92692c36f63ef652f3c84cccedd5674ee7b383 unstructured[all-docs] python-dotenv faiss-cpu