ex8

ngosangns · Feb 24, 2019 · 58e8a53 · 58e8a53
1 parent 08ca546
commit 58e8a53
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Showing 2 changed files with 31 additions and 10 deletions.
diff --git a/ex/ex8/cofiCostFunc.m b/ex/ex8/cofiCostFunc.m
@@ -40,17 +40,23 @@
 %                     partial derivatives w.r.t. to each element of Theta
 %
 
-for i = 1:num_movies
-	for j = 1:num_users
-		if(R(i, j)==1)
-			J = J + (Theta(j, :)*transpose(X(i, :))-Y(i, j)).^2;
-		end;
-	end;
+% J ---------------------------
+% X = m*k
+% Theta = j*k
+% Y = m*j = R
+J = (X*transpose(Theta)-Y).^2;
+J = sum(sum(J.*R));
+J = (J + lambda*(sum(sum(Theta.^2)) + sum(sum(X.^2))))/2;
+% X_grad ----------------------
+for k = 1:num_features
+	X_grad = ((X*transpose(Theta)-Y).*R)*Theta;
+	X_grad = X_grad + (lambda.*X);
+end;
+% Theta_grad ------------------
+for k = 1:num_features
+	Theta_grad = transpose((X*transpose(Theta)-Y).*R)*X;
+	Theta_grad = Theta_grad + (lambda.*Theta);
 end;
-X = [zeros(num_movies, 1) X(:, 2:end)];
-Theta = [zeros(num_movies, 1) Theta(:, 2:end)];
-J = J + sum(sum(X.^2)) + sum(sum(Theta.^2));
-X(:, 1) = ones(num_movies, 1);
 
 % =============================================================
 

diff --git a/ex/ex8/token.mat b/ex/ex8/token.mat
@@ -0,0 +1,15 @@
+# Created by Octave 4.4.1, Sun Feb 24 12:03:11 2019 GMT <unknown@DESKTOP-MBF20VQ>
+# name: email
+# type: sq_string
+# elements: 1
+# length: 21
+scotter7902@gmail.com
+
+
+# name: token
+# type: sq_string
+# elements: 1
+# length: 16
+PXFW0JhAbEF8jIoG
+
+