Fix parallel updater
Fix parallel updater

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