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Retrieval based on probabilistic LM

  • Intuition

    • Users …

      • Have a reasonable idea of terms that are likely to occur in documents of interest.

      • They will choose query terms that distinguish these documents from others in the collection.

  • Collection statistics …

    • Are integral parts of the language model.

    • Are not used heuristically as in many other approaches.

      • In theory. In practice, there’s usually some wiggle room for empirically set parameters

Speaker notes:

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