Glossary · Retrieval & generation
Maximum Marginal Relevance (MMR)
A selection rule that balances relevance to the query with novelty relative to items already selected.
Why it matters
It can reduce redundant chunks so a limited context budget covers more distinct evidence.
In practice
Retrieve a candidate pool, select the next item using a documented relevance-diversity weight, and evaluate both answer quality and source coverage.
Common confusion
MMR diversifies an existing candidate set; it does not retrieve missing evidence or prove that selected passages are correct.
Related terms
Sources
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