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Probability Ranking Principle

  • More complex case: retrieval costs.

    • Let d be a document

    • C - cost of retrieval of relevant document

    • C’ - cost of retrieval of non-relevant document

  • Probability Ranking Principle: if

  • for all d’ not yet retrieved, then d is the next document to be retrieved

  • We won’t further consider loss/utility from now on

Speaker notes:

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