ref numpy pr-6131
ref numpy pr-6131

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