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Retrieval based on probabilistic LM

  • Treat the generation of queries as a random process.

  • Approach

    • Infer a language model for each document.

    • Estimate the probability of generating the query according to each of these models.

    • Rank the documents according to these probabilities.

    • Usually a unigram estimate of words is used

      • Some work on bigrams, paralleling van Rijsbergen


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