Revert change and prefer parenthesis
Revert change and prefer parenthesis

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