fix a mistake
fix a mistake

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