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Thesaurus-based query expansion

  • For each term, t, in a query, expand the query with synonyms and related words of t from the thesaurus

    • feline → feline cat

  • May weight added terms less than original query terms.

  • Generally increases recall

  • Widely used in many science/engineering fields

  • May significantly decrease precision, particularly with ambiguous terms.

    • “interest rate”  “interest rate fascinate evaluate”

  • There is a high cost of manually producing a thesaurus

    • And for updating it for scientific changes

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