fix norm constraint update type
fix norm constraint update type

takacsg84/Lasagne,diogo149/Lasagne,mheilman/Lasagne,MihailoIsakov/fishfish,kracwarlock/Lasagne,gabortakacs/Lasagne,ErnstHowie/Lasagne,Richi91/nntools,cancan101/Lasagne,ebattenberg/Lasagne,rlkelly/Lasagne,DeanChan/Lasagne,dnuffer/Lasagne,DataFighter/Lasagne-tutorial