-runtime/referecne: we allow non-const reference argument
-runtime/referecne: we allow non-const reference argument

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