Cosine zoo sib xws feem ntau yog siv los ua qhov ntsuas rau ntsuas qhov deb thaum qhov loj ntawm vectors tsis muaj teeb meem. Qhov no tshwm sim piv txwv li thaum ua haujlwm nrog cov ntaub ntawv cov ntaub ntawv sawv cev los ntawm cov lus suav.
Thaum twg kuv yuav tsum siv cosine zoo sib xws?
Cosine zoo sib xws ntsuas qhov zoo sib xws ntawm ob lub vectors ntawm qhov chaw khoom sab hauv. Nws yog ntsuas los ntawm lub cosine ntawm lub kaum sab xis ntawm ob vectors thiab txiav txim siab seb ob vectors yog taw tes nyob rau hauv roughly tib txoj kev. Nws feem ntau yog siv los ntsuas cov ntaub ntawv zoo sib xws hauv ntawv tshuaj ntsuam.
Vim li cas siv cosine zoo sib xws hloov ntawm Euclidean nrug?
Qhov zoo sib xws ntawm cosine yog qhov zoo vim tias txawm tias ob daim ntawv zoo sib xws nyob deb ntawm Euclidean deb vim qhov loj me (xws li, lo lus 'kab cij' tshwm 50 zaug hauv ib daim ntawv thiab 10 zaug hauv lwm qhov) lawv tuaj yeem tseem muaj ib lub kaum me me ntawm lawv. Lub kaum sab xis me dua, siab dua qhov zoo sib xws.
Dab tsi yog qhov txawv ntawm cosine zoo sib xws thiab Euclidean nrug?
Nyob rau hauv kab lus no, peb tau kawm cov lus txhais ntawm Euclidean nrug thiab cosine zoo sib xws. Lub Euclidean nrug sib raug rau tus L2-tus qauv ntawm qhov sib txawv ntawm vectors. Cov cosine zoo sib xws yog proportional rau cov khoom dot ntawm ob vectors thiab inversely proportional rau cov khoom ntawm lawv magnitudes.
Dab tsi yog qhov sib txawv ntawm cosine zoo sib xws thiab cosine nrug?
Feem ntau, tib neeg siv cov cosine zoo sib xws raws li kev ntsuas qhov sib xws ntawm vectors. Tam sim no, qhov kev ncua deb tuaj yeem txhais tau tias yog 1-cos_similarity. Qhov kev xav hauv qab no yog tias 2 vectors zoo ib yam ces qhov zoo sib xws yog 1 (lub kaum=0) thiab yog li, qhov deb yog 0 (1-1=0).
