Improve internal
Improve internal

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