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Unformatted text preview: = v
Di ( w i 1 ,..., w iN )
Q ( wq1 ,..., wqN ) = Dot product similarity : w 0 if a term is absent
sim (Q , Di )
wqj w ij
j1 N similarity D Q = wti D wti Q Cosine : vv
sim (Q , Di ) j1
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
avdl s c tQ N
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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.
- Winter '06