Enable CUDA in backprop tests of dot
Enable CUDA in backprop tests of dot

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