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Topic: chi squared kernel equation
Replies: 1   Last Post: Jan 14, 2014 6:28 PM

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amira ali

Posts: 160
Registered: 5/15/11
chi squared kernel equation
Posted: Jan 14, 2014 7:34 AM
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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) =1-D

D=sum[(xi-yi)^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));



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