Use ctor() and std::iota
Use ctor() and std::iota

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