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Regularized Cost

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neingeist 2014-11-27 23:47:18 +01:00
parent e1e66778f8
commit 111a0d1cca
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ex8/cofiCostFunc.m
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@ -40,7 +40,9 @@ Theta_grad = zeros(size(Theta));
% partial derivatives w.r.t. to each element of Theta
%
J = 0.5 * sum(sum(R.*(X*Theta'-Y).^2));
J = 0.5 * sum(sum(R.*(X*Theta'-Y).^2)) ...
+ 0.5 * lambda * sum(sum(Theta.^2)) ...
+ 0.5 * lambda * sum(sum(X.^2));
X_grad = (R.*(X*Theta'-Y))*Theta; % mov X user * uxer X feat = mov X feat
Theta_grad = (R.*(X*Theta'-Y))'*X; % user X mov * mov X feat = user X feat