09 - = v Di ( w i 1 ,..., w iN ) v Q ( wq1 ,..., wqN ) =...

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Unformatted text preview: = v Di ( w i 1 ,..., w iN ) v Q ( wq1 ,..., wqN ) = Dot product similarity : w 0 if a term is absent N vv sim (Q , Di ) wqj w ij j1 N similarity D Q = wti D wti Q Cosine : vv sim (Q , Di ) j1 N j1 ( normalized dot product) (,) ! # ", = ! wqj w ij ( wqj ) 2 N j1 ( w ij ) 2 = ! # " wti D TF (ti , D) c(ti , D) = wti D = TF (ti , D) IDF (ti ) = TF (ti , D) ln( N +1 ) df S QD t QD s ctD dl avdl s c tQ N df ...
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This note was uploaded on 04/13/2010 for the course CSE 671 taught by Professor Hakanferhatosmanoglu during the Winter '06 term at Ohio State.

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