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A better way would be to ask the LLM to generate keywords (or queries). And then use old school techniques to find a set of documents, and then filter those using another LLM.

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How is that better than embeddings? You’re using embeddings to get a finite list of keywords, throwing out the extra benefits of embeddings (support for every human language, for instance), using a conventional index, and then going back to embeddings space for the final LLM?

That whole thing can be simplified to: compute and store embeddings for docs, compute embeddings for query, find most similar docs.

Yes, you can do the "old school search" part with embeddings.

Ah, I had interpreted “old school search” to mean classic text indexing and Boolean style search. I’d argue that if it’s using embeddings and cosine similarity, it’s not old school. But that’s just semantics.

https://arxiv.org/abs/2212.10496

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