Dictionaries and Tolerant Retrieval
Dictionaries and Tolerant Retrieval
Dictionaries and Tolerant Retrieval
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Introduction to Information <strong>Retrieval</strong>B‐trees h<strong>and</strong>le *’s at the end of aSec. 3.2query term• How can we h<strong>and</strong>le*’s in the middle of query term?• co*tion• We could look up co* AND *tion in a B‐tree <strong>and</strong>intersect the two term sets• Expensive• The solution: transform wild‐card queries so that the*’s occur at the end• This gives rise to the Permuterm Index.14
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