Remove unused variable
Remove unused variable

keisuke-umezawa/chainer,chainer/chainer,ktnyt/chainer,jnishi/chainer,hvy/chainer,jnishi/chainer,wkentaro/chainer,jnishi/chainer,niboshi/chainer,wkentaro/chainer,ronekko/chainer,okuta/chainer,ktnyt/chainer,niboshi/chainer,hvy/chainer,rezoo/chainer,jnishi/chainer,tkerola/chainer,aonotas/chainer,okuta/chainer,hvy/chainer,anaruse/chainer,ktnyt/chainer,wkentaro/chainer,keisuke-umezawa/chainer,chainer/chainer,chainer/chainer,niboshi/chainer,hvy/chainer,okuta/chainer,keisuke-umezawa/chainer,keisuke-umezawa/chainer,okuta/chainer,ktnyt/chainer,niboshi/chainer,chainer/chainer,wkentaro/chainer,pfnet/chainer