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Indirect relevance feedback

  • On the web, DirectHit introduced a form of indirect relevance feedback.

  • DirectHit ranked documents higher that users look at more often.

    • Clicked on links are assumed likely to be relevant

      • Assuming the displayed summaries are good, etc.

  • Globally: Not necessarily user or query specific.

    • This is the general area of clickstream mining

  • Today – handled as part of machine-learned ranking

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