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Feature Selection

  • Given a set of frequent patterns, both non-discriminative and redundant patterns exist, which can cause overfitting
  • We want to single out the discriminative patterns and remove redundant ones
  • The notion of Maximal Marginal Relevance (MMR) is borrowed
    • A document has high marginal relevance if it is both relevant to the query and contains minimal marginal similarity to previously selected documents

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