Initialize d[name].grad to None
Initialize d[name].grad to None

pfnet/chainer,niboshi/chainer,ktnyt/chainer,chainer/chainer,okuta/chainer,jnishi/chainer,jnishi/chainer,tkerola/chainer,rezoo/chainer,okuta/chainer,okuta/chainer,aonotas/chainer,wkentaro/chainer,wkentaro/chainer,cupy/cupy,ktnyt/chainer,ktnyt/chainer,ronekko/chainer,cupy/cupy,jnishi/chainer,hvy/chainer,niboshi/chainer,keisuke-umezawa/chainer,okuta/chainer,anaruse/chainer,delta2323/chainer,niboshi/chainer,wkentaro/chainer,niboshi/chainer,hvy/chainer,chainer/chainer,kiyukuta/chainer,hvy/chainer,kashif/chainer,wkentaro/chainer,ktnyt/chainer,chainer/chainer,ysekky/chainer,cupy/cupy,chainer/chainer,keisuke-umezawa/chainer,hvy/chainer,keisuke-umezawa/chainer,cupy/cupy,keisuke-umezawa/chainer,jnishi/chainer