Remove a local variable used only one time
Remove a local variable used only one time

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