완료

ex5/ex5.m

@@ -164,7 +164,7 @@ pause;
 %  lambda to see how the fit and learning curve change.
 %
 
-lambda = 0;
+lambda = 3;
 [theta] = trainLinearReg(X_poly, y, lambda);
 
 % Plot training data and fit
@@ -218,3 +218,11 @@ end
 
 fprintf('Program paused. Press enter to continue.\n');
 pause;
+
+
+
+%% Computing test set error
+lambda = 3;
+[theta] = trainLinearReg(X_poly, y, lambda);
+testSetError = linearRegCostFunction(X_poly_test, ytest, theta, 0);
+fprintf('#Test Set Error for lambda(%f) : %f\n', lambda, testSetError);

ex5/learningCurve.m

@@ -53,11 +53,13 @@ error_val   = zeros(m, 1);
 
 % ---------------------- Sample Solution ----------------------
 
+for i = 1:m
 
+  [theta] = trainLinearReg(X(1:i, :), y(1:i), lambda);
+  error_train(i) = linearRegCostFunction(X(1:i, :), y(1:i), theta, 0);
+  error_val(i) = linearRegCostFunction(Xval, yval, theta, 0);
 
-
+endfor
-
-
 
 % -------------------------------------------------------------
 

ex5/linearRegCostFunction.m

@@ -21,8 +21,9 @@ grad = zeros(size(theta));
 
 
 
-
+hx = X*theta;
-
+J = sum((hx - y).**2)/(2*m) + lambda*sum((theta(2:end).**2))/(2*m);
+grad = (sum((hx-y).*X)/m)' + lambda*[0; theta(2:end)]/m;
 
 
 

ex5/polyFeatures.m

@@ -15,10 +15,8 @@ X_poly = zeros(numel(X), p);
 %
 % 
 
-
+for i = 1:p
-
+  X_poly(:, i) = X.^i;
-
-
 
 % =========================================================================
 

ex5/token.mat

@@ -0,0 +1,15 @@
+# Created by Octave 4.2.1, Sun May 28 20:19:23 2017 GMT <unknown@unknown>
+# name: email
+# type: sq_string
+# elements: 1
+# length: 16
+mjjo53@gmail.com
+
+
+# name: token
+# type: sq_string
+# elements: 1
+# length: 16
+9vAaPE4tKr9tF716
+
+

ex5/validationCurve.m

@@ -39,14 +39,14 @@ error_val = zeros(length(lambda_vec), 1);
 %
 %
 
+for i = 1:length(lambda_vec)
   
+  lambda = lambda_vec(i);
+  [theta] = trainLinearReg(X, y, lambda);
+  error_train(i) = linearRegCostFunction(X, y, theta, 0);
+  error_val(i) = linearRegCostFunction(Xval, yval, theta, 0);
 
-
+endfor
-
-
-
-
-
 
 % =========================================================================