Mask normalization fix.
Mask normalization fix.

takacsg84/Lasagne,DeanChan/Lasagne,rlkelly/Lasagne,gabortakacs/Lasagne,kracwarlock/Lasagne,dnuffer/Lasagne,cancan101/Lasagne,ebattenberg/Lasagne,mheilman/Lasagne,ErnstHowie/Lasagne,MihailoIsakov/fishfish,Richi91/nntools,DataFighter/Lasagne-tutorial