Update ParallelUpdater to enable CPU execution
Update ParallelUpdater to enable CPU execution

chainer/chainer,hvy/chainer,wkentaro/chainer,okuta/chainer,niboshi/chainer,okuta/chainer,wkentaro/chainer,ronekko/chainer,tkerola/chainer,rezoo/chainer,chainer/chainer,chainer/chainer,pfnet/chainer,ktnyt/chainer,niboshi/chainer,niboshi/chainer,keisuke-umezawa/chainer,kiyukuta/chainer,hvy/chainer,wkentaro/chainer,chainer/chainer,delta2323/chainer,ktnyt/chainer,jnishi/chainer,jnishi/chainer,cupy/cupy,jnishi/chainer,hvy/chainer,kashif/chainer,aonotas/chainer,niboshi/chainer,ktnyt/chainer,wkentaro/chainer,ktnyt/chainer,cupy/cupy,okuta/chainer,cupy/cupy,okuta/chainer,cupy/cupy,ysekky/chainer,jnishi/chainer,hvy/chainer,anaruse/chainer,keisuke-umezawa/chainer,keisuke-umezawa/chainer,keisuke-umezawa/chainer