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Back to the lesson libraryMECHANISM · 13 MIN
M26.4 CONNECT THE MECHANISM

Improve candidate retrieval and rank the useful evidence

Keyword search nails "KB-220" but misses "money back"; vector search does the opposite. Rewrite the question, fuse both result lists, and let a careful reranker pick the winners.

LESSON OVERVIEW13 min lesson

Lesson overview

Keyword search nails "KB-220" but misses "money back"; vector search does the opposite. Rewrite the question, fuse both result lists, and let a careful reranker pick the winners.

What you’ll explore

  • Query rewriting, lexical/dense fusion, and reranking address different retrieval failures; evaluate each stage with relevance judgments and resource budgets.
GO TO THE SOURCE

Original explanations, connected to the research.

Reciprocal Rank Fusion Outperforms Condorcet and Individual Rank Learning Methods (Cormack, Clarke & Büttcher, 2009)Passage Re-ranking with BERT (Nogueira & Cho, 2019)Precise Zero-Shot Dense Retrieval without Relevance Labels (Gao et al., 2022)Introduction to Information Retrieval — authors’ online edition
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