Add zero_grads
Add zero_grads

ktnyt/chainer,woodshop/complex-chainer,jnishi/chainer,woodshop/chainer,nushio3/chainer,anaruse/chainer,hvy/chainer,cupy/cupy,AlpacaDB/chainer,jnishi/chainer,niboshi/chainer,yanweifu/chainer,keisuke-umezawa/chainer,bayerj/chainer,muupan/chainer,niboshi/chainer,wavelets/chainer,keisuke-umezawa/chainer,kashif/chainer,laysakura/chainer,ktnyt/chainer,aonotas/chainer,okuta/chainer,cupy/cupy,Kaisuke5/chainer,chainer/chainer,rezoo/chainer,hvy/chainer,sinhrks/chainer,okuta/chainer,kiyukuta/chainer,chainer/chainer,elviswf/chainer,benob/chainer,ktnyt/chainer,ronekko/chainer,hidenori-t/chainer,nushio3/chainer,keisuke-umezawa/chainer,sinhrks/chainer,niboshi/chainer,umitanuki/chainer,pfnet/chainer,okuta/chainer,minhpqn/chainer,tkerola/chainer,jfsantos/chainer,wkentaro/chainer,truongdq/chainer,tigerneil/chainer,hvy/chainer,t-abe/chainer,ktnyt/chainer,hvy/chainer,kikusu/chainer,jnishi/chainer,ttakamura/chainer,wkentaro/chainer,tereka114/chainer,ysekky/chainer,chainer/chainer,muupan/chainer,AlpacaDB/chainer,chainer/chainer,kikusu/chainer,truongdq/chainer,wkentaro/chainer,delta2323/chainer,1986ks/chainer,ikasumi/chainer,cupy/cupy,sou81821/chainer,jnishi/chainer,okuta/chainer,cupy/cupy,kuwa32/chainer,tscohen/chainer,keisuke-umezawa/chainer,t-abe/chainer,masia02/chainer,cemoody/chainer,niboshi/chainer,benob/chainer,ttakamura/chainer,ytoyama/yans_chainer_hackathon,wkentaro/chainer