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Problems of basic LM approach

  • Assumption of equivalence between document and information problem representation is unrealistic

    • Very simple models of language

    • Relevance feedback is difficult to integrate, as are user preferences, and other general issues of relevance

    • Can’t easily accommodate phrases, passages, Boolean operators

  • Current extensions focus on putting relevance back into the model, etc.

  • LM vs. Prob. Model for IR


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