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Translation model (Berger and Lafferty)

  • Basic LMs do not address issues of synonymy.

    • Or any deviation in expression of information need from language of documents

  • A translation model lets you generate query words not in document via “translation” to synonyms etc.

    • Or to do cross-language IR, or multimedia IR

    • Need to learn a translation model (using a dictionary or via statistical machine translation)

Speaker notes:

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