IR-part1

243 combinaon schemes these two approaches can be

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Unformatted text preview: ty palo AND palo alto Without the docs, we cannot verify that the docs matching the above Boolean query do contain the phrase. Can have false positives! Introduc)on to Informa)on Retrieval Sec. 2.4.1 Extended biwords §༊  Parse the indexed text and perform part- of- speech- tagging (POST). §༊  Bucket the terms into (say) Nouns (N) and ar*cles/ preposi*ons (X). §༊  Call any string of terms of the form NX*N an extended biword. §༊  Each such extended biword is now made a term in the dic*onary. §༊  Example: catcher in the rye N X X N §༊  Query processing: parse it into N’s and X’s §༊  Segment query into enhanced biwords §༊  Look up in index: catcher rye Introduc)on to Informa)on Retrieval Sec. 2.4.1...
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This document was uploaded on 02/14/2014.

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