Remove unnecessary to_gpu
Remove unnecessary to_gpu

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