diversity

Top-k by pure similarity often hands the model five paraphrases of the same paragraph, starving it of the other facts the question needs. The fix is ranking for relevance and novelty at once. Here is how.

Rank each item by relevance alone and you ship ten near-identical results and a filter bubble. The signal interviewers want is a re-ranking stage that scores the list as a set, plus the metric that proves it works.