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Relevance Feedback: Problems

  • Long queries are inefficient for typical IR engine.                           ⇐  Why?

    • Long response times for user.

    • High cost for retrieval system.

    • Partial solution:

      • Only reweight certain prominent terms

        • Perhaps top 20 by term frequency

  • Users are often reluctant to provide explicit feedback

  • It’s often harder to understand why a particular document was retrieved after applying relevance feedback

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