hyde

Retrieval quality is capped by the query, and raw user queries are often bad for search. The signal is knowing the techniques that rewrite the query before retrieval and which failure each fixes.

A short question and the passage that answers it live in different neighborhoods of embedding space. HyDE closes that gap by embedding a fake answer instead of the question. The signal is knowing why a wrong hypothetical still retrieves the right docs.

HyDE generates a fake answer to embed, which helps on vague queries but actively hurts on factual or out-of-domain ones. The signal is naming exactly when the hypothetical document misleads retrieval and which multi-draft and hybrid variants recover.