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Log-frequency weighting

  • The log frequency weight of term t in d is

  • 0 → 0, 1 → 1, 2 → 1.3, 10 → 2, 1000 → 4, etc.

  • Score for a document-query pair: sum over terms t in both q and d:

  • The score is 0 if none of the query terms is present in the document.
    score : 

Speaker notes:

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