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Probabilistic Relevance Feedback

  1. Guess a preliminary probabilistic description of R and use it to retrieve a first set of documents V, as above.
  2. Interact with the user to refine the description: learn some definite members of R and NR

  3. Reestimate pi and ri on the basis of these
      • Or can combine new information with original guess (use Bayesian prior):
  4. Repeat, thus generating a succession of approximations to R

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