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Pseudo relevance feedback

  • Pseudo-relevance feedback automates the “manual” part of true relevance feedback.

  • Pseudo-relevance algorithm:

    • Retrieve a ranked list of hits for the user’s query

    • Assume that the top k documents are relevant.

    • Do relevance feedback (e.g., Rocchio)

  • Works very well on average

  • But can go horribly wrong for some queries.

  • Several iterations can cause query drift.

  • Why?

Speaker notes:

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