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Finishes Week 9 assignment

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julien Lengrand-Lambert
2016-01-03 12:26:28 +01:00
parent 05261e7408
commit d176764f9c
3 changed files with 9 additions and 3 deletions
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8
machine-learning-ex8/ex8/cofiCostFunc.m
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@@ -46,7 +46,7 @@ t3 = t2(R==1); % only when movie has been rated.
temp = sum(t3(:)); temp = sum(t3(:));
J = (1/2) * (temp); J = (1/2) * (temp);
% adding regularization % adding regularization to cost
x_temp = X.^2; x_temp = X.^2;
theta_temp = Theta.^2; theta_temp = Theta.^2;
reg_x = (lambda / 2) * sum(x_temp(:)); reg_x = (lambda / 2) * sum(x_temp(:));
@@ -58,6 +58,12 @@ temp1 = ((Theta*X')' - Y);
temp1(find(R==0)) = 0; % only when movie has been rated. temp1(find(R==0)) = 0; % only when movie has been rated.
X_grad = temp1 * Theta; X_grad = temp1 * Theta;
Theta_grad = temp1' * X; Theta_grad = temp1' * X;
% adding regularization to gradients
X_temp2 = X.*lambda;
Theta_temp2 = Theta.*lambda;
X_grad = X_grad + X_temp2;
Theta_grad = Theta_grad + Theta_temp2;
% ============================================================= % =============================================================
grad = [X_grad(:); Theta_grad(:)]; grad = [X_grad(:); Theta_grad(:)];

4
machine-learning-ex8/ex8/ex8_cofi.m
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@@ -40,7 +40,7 @@ ylabel('Movies');
xlabel('Users'); xlabel('Users');
fprintf('\nProgram paused. Press enter to continue.\n'); fprintf('\nProgram paused. Press enter to continue.\n');
% pause; pause;
%% ============ Part 2: Collaborative Filtering Cost Function =========== %% ============ Part 2: Collaborative Filtering Cost Function ===========
% You will now implement the cost function for collaborative filtering. % You will now implement the cost function for collaborative filtering.
@@ -66,7 +66,7 @@ fprintf(['Cost at loaded parameters: %f '...
'\n(this value should be about 22.22)\n'], J); '\n(this value should be about 22.22)\n'], J);
fprintf('\nProgram paused. Press enter to continue.\n'); fprintf('\nProgram paused. Press enter to continue.\n');
% pause; pause;
%% ============== Part 3: Collaborative Filtering Gradient ============== %% ============== Part 3: Collaborative Filtering Gradient ==============

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machine-learning-ex8/ex8/token.mat
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