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Normalization to terms

  • We need to “normalize” words in indexed text as well as query words into the same form

    • We want to match U.S.A. and USA

  • Result is terms: a term is a (normalized) word type, which is an entry in our IR system dictionary

  • We most commonly implicitly define equivalence classes of terms by, e.g.,

    • deleting periods to form a term

      • U.S.A., USA ⌊ USA

    • deleting hyphens to form a term

      • anti-discriminatory, antidiscriminatory ⌊ antidiscriminatory

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