rag_from_scratch 是油管视频的资料
langgraph_ 是rag_from_scratch15-18中提到的高阶RAG的代码，如果大家看了文献 https://arxiv.org/abs/2312.10997v5 就会发现这些就是最前沿的RAG模型
HelloLlamaCloud 是LLAMA官方教学使用langchain构建RAG的文档
Retrieval augmented generation (RAG) comes is a general methodology for connecting LLMs with external data sources. These notebooks accompany a video playlist that builds up an understanding of RAG from scratch, starting with the basics of indexing, retrieval, and generation.
