IR-part2

68 introducon to informaon retrieval sec 86 measures

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Unformatted text preview: eight schemes. Why is the base of the log in idf immaterial? Introduc)on to Informa)on Retrieval k- idf weigh*ng has many variants Sec. 6.4 Introduc)on to Informa)on Retrieval Weigh*ng may differ in queries vs documents S ec. 6.4 §༊  Many search engines allow for different weigh*ngs for queries vs. documents §༊  SMART Nota*on: denotes the combina*on in use in an engine, with the nota*on ddd.qqq, using the acronyms from the previous table §༊  A very standard weigh*ng scheme is: lnc.ltc §༊  Document: logarithmic k (l as first character), no idf and cosine normaliza*on A bad idea? §༊  Query: logarithmic k (l in leNmost column), idf (t in second column), cosine normaliza*on … Introduc)on to Informa)on Retrieval Sec. 6.4 k- idf example: lnc.ltc Document: car insurance auto insura...
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