bug in mlp fixed

Author: kyunghyuncho

mlp.m

@@ -220,7 +220,7 @@
             end
 
             if l == n_layers && M.output.binary
-                h0{l} = sigmoid(h0{l});
+                h0{l} = softmax(h0{l});
             end
         end
 

mlp_classify.m

@@ -48,7 +48,7 @@
         end
 
         if l == n_layers && M.output.binary
-            posterior = sigmoid(posterior);
+            posterior = softmax(posterior);
         end
     end
 else
@@ -64,7 +64,7 @@
         end
 
         if l == n_layers && M.output.binary
-            posterior = sigmoid(posterior);
+            posterior = softmax(posterior);
         end
     end
 end

softmax.m

@@ -0,0 +1,7 @@
+% simple wrapper for softmax function
+function [y] = softmax(x)
+
+logZ = logsum(x, 2);
+y = exp(bsxfun(@minus, x, logZ));
+
+