Avoid unsigned representation mismatch of negative values
Avoid unsigned representation mismatch of negative values

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