Fix compile error
Fix compile error

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