fix implementation
fix implementation

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