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IDF (plural IDFs)

  1. (statistics) Initialism of inverse document frequency.
    • 2011, Matthew Russell, Mining the Social Web, page 215:
      A finer point to observe is that the sample implementation provided in Example 7-4 adjusts the IDF score by adding a value of 1.0 to the logarithm calculation, for the purposes of illustration and because we're dealing with a trivial document set.
    • 2014, Manas A. Pathak, Beginning Data Science with R, page 147:
      The idea behind inverse document frequency (IDF) is that all words in the corpus are not equally important.
    • 2019, Hobson Lane, Cole Howard, Hannes Max Hapke, Natural Language Processing In Action [] , Shelter Island: Manning, →ISBN:
      Inverse document frequency, or IDF, is your window through Zipf in topic analysis.

Derived terms[edit]

Proper noun[edit]


  1. (military) Initialism of Iceland Defense Force.
  2. (military) Initialism of Irish Defence Forces.
  3. (military) Initialism of Israel Defense Forces.
    • 2023 October 9, Ben Doherty, “Israel military says situation ‘dire’ in south as 260 bodies retrieved from festival”, in The Guardian[1], →ISSN:
      IDF says fighting is ongoing in south, saying it ‘could be a 9/11 and a Pearl Harbour wrapped into one’ as Supernova festival-goers describe attack[.]