Avoid unused-parameter warning
Avoid unused-parameter warning

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