
Re: chi squared kernel equation
Posted:
Jan 14, 2014 6:28 PM


"amira ali" wrote in message <lb3arv$g52$1@newscl01ah.mathworks.com>... > please i have two equation for chi square kernel and i want to know which one is correct ,where one without exp and another with exp? > first one is : > K(x, y) =1D > > D=sum[(xiyi)^2./((1/2)x+y)] and implementation is > > function D = chi2Kernel(X,Y) > D = zeros(size(X,1),size(Y,1)); > for i=1:size(Y,1) > d = bsxfun(@minus, X, Y(i,:)); > s = bsxfun(@plus, X, Y(i,:)); > D(:,i) = sum(d.^2 ./ (s/2+eps), 2); > end > D = 1  D; > end > > second one is K(xi; xj) = 1/A exp(D(xi; xj)); there are any help?

