
S1E08. Open Book: RAG Done Honestly
transcript
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This episode is narrated using AI voice technology. The content and script are original.
Open book. The model does not have to remember your documents. It has to find the right page and read it at the moment you ask. That is retrieval augmented generation, and the honest version is smaller than the demo.
Rob walks the pipeline without the magic: chunk the material, embed the chunks, store them, retrieve the nearest ones, stuff them into the prompt, generate. The retrieval is the part that fails. Chunking too big or too small. An embedding space that cannot tell your two products apart. A vector database that is just a drawer with a better index. Grounding is the claim that the answer came from the pages you handed it, and you can check. NVIDIA's retriever sits in that drawer. Hallucination is what happens when the book is the wrong book, or no book, and the model talks anyway.
Takeaway: if you cannot point at the page, it was not open book.
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