Collaborative Filtering Gradient
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@ -42,6 +42,8 @@ Theta_grad = zeros(size(Theta));
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J = 0.5 * sum(sum(R.*(X*Theta'-Y).^2));
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X_grad = (R.*(X*Theta'-Y))*Theta; % mov X user * uxer X feat = mov X feat
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Theta_grad = (R.*(X*Theta'-Y))'*X; % user X mov * mov X feat = user X feat
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% =============================================================
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