Remove numpy.sum
Remove numpy.sum

sinhrks/chainer,okuta/chainer,tscohen/chainer,kikusu/chainer,okuta/chainer,jnishi/chainer,niboshi/chainer,cupy/cupy,benob/chainer,ysekky/chainer,kiyukuta/chainer,niboshi/chainer,okuta/chainer,pfnet/chainer,kashif/chainer,wkentaro/chainer,sou81821/chainer,chainer/chainer,aonotas/chainer,ktnyt/chainer,jnishi/chainer,sinhrks/chainer,muupan/chainer,cemoody/chainer,keisuke-umezawa/chainer,AlpacaDB/chainer,t-abe/chainer,anaruse/chainer,chainer/chainer,cupy/cupy,minhpqn/chainer,wkentaro/chainer,wkentaro/chainer,ktnyt/chainer,tigerneil/chainer,muupan/chainer,truongdq/chainer,kikusu/chainer,keisuke-umezawa/chainer,jnishi/chainer,wkentaro/chainer,hvy/chainer,chainer/chainer,hvy/chainer,ytoyama/yans_chainer_hackathon,delta2323/chainer,ktnyt/chainer,t-abe/chainer,cupy/cupy,ktnyt/chainer,niboshi/chainer,jnishi/chainer,cupy/cupy,niboshi/chainer,keisuke-umezawa/chainer,okuta/chainer,hvy/chainer,1986ks/chainer,chainer/chainer,truongdq/chainer,rezoo/chainer,Kaisuke5/chainer,AlpacaDB/chainer,keisuke-umezawa/chainer,hvy/chainer,laysakura/chainer,benob/chainer,ronekko/chainer,tkerola/chainer