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Extension: 3-level model

  • 3-level model

  1. Whole collection model (Mc)

  2. Specific-topic model; relevant-documents model (Mt)

  3. Individual-document model (Md)

    • Relevance hypothesis

      • A request(query; topic) is generated from a specific-topic model { Mc, Mt}.

      • Iff a document is relevant to the topic, the same model will apply to the document.

        • It will replace part of the individual-document model in explaining the document.

      • The probability of relevance of a document

        • The probability that this model explains part of the document

        • The probability that the {Mc ,Mt ,Md } combination is better than the {Mc ,Md } combination


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