refer numpy code
refer numpy code

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