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Model Comparison

  • Estimate query and document models and compare

  • Suitable measure is KL divergence D(Qm||Dm)

    • equivalent to query-likelihood approach if simple empirical distribution used for query model

  • More general risk minimization framework has been proposed

    • Zhai and Lafferty 2001

  • Better results than query-likelihood or document-likelihood approaches

Speaker notes:

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