Refactor the logic to make view for identical gradients
Refactor the logic to make view for identical gradients

keisuke-umezawa/chainer,wkentaro/chainer,chainer/chainer,ktnyt/chainer,hvy/chainer,okuta/chainer,wkentaro/chainer,hvy/chainer,niboshi/chainer,ktnyt/chainer,tkerola/chainer,keisuke-umezawa/chainer,ktnyt/chainer,niboshi/chainer,jnishi/chainer,jnishi/chainer,okuta/chainer,chainer/chainer,keisuke-umezawa/chainer,wkentaro/chainer,hvy/chainer,okuta/chainer,wkentaro/chainer,niboshi/chainer,okuta/chainer,jnishi/chainer,jnishi/chainer,keisuke-umezawa/chainer,chainer/chainer,ktnyt/chainer,hvy/chainer,chainer/chainer,niboshi/chainer,pfnet/chainer