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242 posional index size a posional index expands

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Unformatted text preview: rks §༊  Many more queries are implicit phrase queries §༊  For this, it no longer suffices to store only <term : docs> entries Introduc)on to Informa)on Retrieval Sec. 2.4.1 A first a_empt: Biword indexes §༊  Index every consecu*ve pair of terms in the text as a phrase §༊  For example the text “Friends, Romans, Countrymen” would generate the biwords §༊  friends romans §༊  romans countrymen §༊  Each of these biwords is now a dic*onary term §༊  Two- word phrase query- processing is now immediate. Introduc)on to Informa)on Retrieval S ec. 2.4.1 Longer phrase queries §༊  Longer phrases can be processed by breaking them down §༊  stanford university palo alto can be broken into the Boolean query on biwords: stanford university AND universi...
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