Simplify code
Simplify code

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