fix a bug about the value of nn.testing in nneval.

Author: golden1232004

NN/nneval.m

@@ -3,6 +3,7 @@
 % Returns a updated loss struct
 assert(nargin == 4 || nargin == 6, 'Wrong number of arguments');
 
+nn.testing = 1;
 % training performance
 nn                    = nnff(nn, train_x, train_y);
 loss.train.e(end + 1) = nn.L;
@@ -12,7 +13,7 @@
     nn                    = nnff(nn, val_x, val_y);
     loss.val.e(end + 1)   = nn.L;
 end
-
+nn.testing = 0;
 %calc misclassification rate if softmax
 if strcmp(nn.output,'softmax')
     [er_train, ~]               = nntest(nn, train_x, train_y);