Add missing #pragma once
Add missing #pragma once

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