"Kernel" yog siv vim txhawm rau teeb tsa kev ua lej siv hauv Kev Txhawb Vector Tshuab muab lub qhov rais los tswj cov ntaub ntawv. Yog li, Kernel Function feem ntau hloov pauv cov txheej txheem kev cob qhia cov ntaub ntawv kom qhov kev txiav txim siab tsis-linear tuaj yeem hloov mus rau qhov sib npaug ntawm cov kab sib npaug hauv ntau qhov ntau dua.
Vim li cas kernel muaj nuj nqi siv?
Nyob hauv kev kawm tshuab, "kernel" feem ntau yog siv los xa mus rau kernel ua kom yuam kev, ib txoj hauv kev siv cov kab sib cais los daws qhov teeb meem tsis yog kab. … Cov kev ua haujlwm kernel yog dab tsi yog siv rau txhua qhov piv txwv ntawm cov ntaub ntawv los qhia cov thawj cov kev soj ntsuam uas tsis yog-linear rau hauv qhov chaw siab dua uas lawv sib cais.
Kernel siv dab tsi hauv SVM?
Qhov kev nyiam tshaj plaws ntawm cov ntsiav muaj nuj nqi yog RBF. Vim tias nws nyob hauv cheeb tsam thiab muaj cov lus teb zoo raws li qhov ua tiav x-axis. Lub kernel ua haujlwm rov qab cov khoom scalar nruab nrab ntawm ob lub ntsiab lus hauv qhov chaw tsim nyog heev.
Dab tsi yog qhov tseeb ntawm kernel hauv SVM?
SVM algorithms siv ib txheej ntawm kev ua lej uas txhais tau tias yog cov ntsiav. Lub ua haujlwm ntawm kernel yog coj cov ntaub ntawv raws li kev nkag thiab hloov mus rau hauv daim ntawv xav tau. … Cov haujlwm no tuaj yeem ua ntau hom. Piv txwv li linear, nonlinear, polynomial, radial hauv paus muaj nuj nqi (RBF), thiab sigmoid.
SVM nrog RBF kernel yog dab tsi?
RBF yog default kernel siv nyob rau hauv sklearn's SVM kev faib tawmalgorithm thiab tuaj yeem piav qhia nrog cov qauv hauv qab no: … Tus nqi pib rau gamma hauv sklearn's SVM kev faib tawm algorithm yog: Luv luv: ||x - x'||² yog qhov squared Euclidean nrug ntawm ob lub cim vectors (2 ntsiab lus).