Refactor forward_gpu
Refactor forward_gpu

masia02/chainer,AlpacaDB/chainer,okuta/chainer,wkentaro/chainer,hvy/chainer,jnishi/chainer,keisuke-umezawa/chainer,wkentaro/chainer,minhpqn/chainer,ktnyt/chainer,yanweifu/chainer,keisuke-umezawa/chainer,hvy/chainer,umitanuki/chainer,niboshi/chainer,sou81821/chainer,keisuke-umezawa/chainer,cupy/cupy,chainer/chainer,woodshop/chainer,kikusu/chainer,hvy/chainer,ysekky/chainer,ktnyt/chainer,chainer/chainer,okuta/chainer,hvy/chainer,delta2323/chainer,wavelets/chainer,sinhrks/chainer,tscohen/chainer,muupan/chainer,ronekko/chainer,benob/chainer,anaruse/chainer,aonotas/chainer,cupy/cupy,wkentaro/chainer,tkerola/chainer,kiyukuta/chainer,ytoyama/yans_chainer_hackathon,sinhrks/chainer,wkentaro/chainer,cemoody/chainer,rezoo/chainer,laysakura/chainer,ktnyt/chainer,cupy/cupy,ktnyt/chainer,jnishi/chainer,hidenori-t/chainer,chainer/chainer,truongdq/chainer,Kaisuke5/chainer,truongdq/chainer,1986ks/chainer,tigerneil/chainer,muupan/chainer,woodshop/complex-chainer,niboshi/chainer,kuwa32/chainer,ikasumi/chainer,niboshi/chainer,jnishi/chainer,keisuke-umezawa/chainer,t-abe/chainer,niboshi/chainer,okuta/chainer,kashif/chainer,AlpacaDB/chainer,jnishi/chainer,benob/chainer,t-abe/chainer,okuta/chainer,cupy/cupy,pfnet/chainer,chainer/chainer,kikusu/chainer