Support ChainerX in ImageNet data parallel example
Support ChainerX in ImageNet data parallel example

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