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Provost Chapter 10 (text (document (one piece of text, tokens, or terms,…

- - - - IDF(t) = 1 + log ( Total number of documents
        Number of documents containing t )
      - IDF(not _T ) = log 1 /(1 - p) = - log (1 - p)
  - - - n-grams
        
        useful when particular phrases are significant but their component words
        may not be