DOC PREVIEW
UCI
ICS 273A -
Quiz 3
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Quiz%3,%ICS%273A%Intro 2 ML%1.%Choose%the%correct%equation%for%mapping%a%test%point%onto%the%manifold%learned%from%kernel%PCA:%A)%€ z = yiαii∑K(xi, xtest)%B)%€ z =αii∑K(xi, xtest)%C)%€ z =i∑K(xi, xtest)%%%%%%%%%%%%%%%%%%%%%%%2.%Consider%the%RBF%kernel:%€ K(x, y) = aexp(−0.5λ|| x − y ||2).%For%which%limit%of%lambda%do%we%expect%over2fitting%in%a%kernel%method%using%this%kernel?%A)%lambda%very%large%B)%lambda%very%small%C)%lambda%=%0%%%%%%%%%%%%%%%%%%%%3.%In%ridge%regression%we%fit€ y = wTΦ (x)with%phi%a%feature%vector%depending%on%x.%We%can%represent%w%as:%€ w
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