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Collaborative Filtering Gradient

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neingeist 2014-11-27 23:43:53 +01:00
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ex8/cofiCostFunc.m
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@ -42,6 +42,8 @@ Theta_grad = zeros(size(Theta));
J = 0.5 * sum(sum(R.*(X*Theta'-Y).^2)); J = 0.5 * sum(sum(R.*(X*Theta'-Y).^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
% ============================================================= % =============================================================