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High and low lists

  • For each term, we maintain two postings lists called high and low

    • Think of high as the champion list

  • When traversing postings on a query, only traverse high lists first

    • If we get more than K docs, select the top K and stop

    • Else proceed to get docs from the low lists

  • Can be used even for simple cosine scores, without global quality g(d)

  • A means for segmenting index into two tiers

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