Add gpu decorator
Add gpu decorator

ysekky/chainer,okuta/chainer,muupan/chainer,tkerola/chainer,pfnet/chainer,rezoo/chainer,kikusu/chainer,niboshi/chainer,tscohen/chainer,cupy/cupy,niboshi/chainer,benob/chainer,keisuke-umezawa/chainer,sinhrks/chainer,anaruse/chainer,ktnyt/chainer,chainer/chainer,hvy/chainer,jnishi/chainer,benob/chainer,jnishi/chainer,keisuke-umezawa/chainer,minhpqn/chainer,t-abe/chainer,kiyukuta/chainer,t-abe/chainer,okuta/chainer,niboshi/chainer,jnishi/chainer,chainer/chainer,AlpacaDB/chainer,wkentaro/chainer,wkentaro/chainer,keisuke-umezawa/chainer,sinhrks/chainer,ktnyt/chainer,truongdq/chainer,cemoody/chainer,chainer/chainer,jnishi/chainer,keisuke-umezawa/chainer,truongdq/chainer,ktnyt/chainer,okuta/chainer,kikusu/chainer,AlpacaDB/chainer,cupy/cupy,ronekko/chainer,niboshi/chainer,okuta/chainer,hvy/chainer,kashif/chainer,cupy/cupy,wkentaro/chainer,chainer/chainer,ktnyt/chainer,muupan/chainer,hvy/chainer,delta2323/chainer,cupy/cupy,hvy/chainer,wkentaro/chainer,aonotas/chainer