langchain_community langchain_groq langchain_core PyPDF2 pydantic langchain_core langchain_experimental youtube_transcript_api python-pptx fastapi langchain_ollama crawl4ai pypdf faiss-gpu textract moviepy pydub pandas numpy ffmpeg pip install pyannote.audio==2.1.1 rapidocr-onnxruntime Pillow unstructured llama_cloud_services llama_index