Catch unparsable @ prefixed device specifiers to raise ValueError
Catch unparsable @ prefixed device specifiers to raise ValueError

hvy/chainer,wkentaro/chainer,hvy/chainer,wkentaro/chainer,chainer/chainer,okuta/chainer,niboshi/chainer,hvy/chainer,niboshi/chainer,chainer/chainer,chainer/chainer,niboshi/chainer,chainer/chainer,okuta/chainer,niboshi/chainer,wkentaro/chainer,okuta/chainer,okuta/chainer,hvy/chainer,wkentaro/chainer,pfnet/chainer