Update optimizer
Update optimizer

keisuke-umezawa/chainer,nushio3/chainer,niboshi/chainer,jnishi/chainer,rezoo/chainer,okuta/chainer,cupy/cupy,keisuke-umezawa/chainer,ktnyt/chainer,elviswf/chainer,kikusu/chainer,ttakamura/chainer,t-abe/chainer,chainer/chainer,cupy/cupy,tkerola/chainer,hvy/chainer,woodshop/chainer,ktnyt/chainer,umitanuki/chainer,ytoyama/yans_chainer_hackathon,jnishi/chainer,ktnyt/chainer,jnishi/chainer,kikusu/chainer,truongdq/chainer,wkentaro/chainer,hvy/chainer,AlpacaDB/chainer,truongdq/chainer,wkentaro/chainer,masia02/chainer,AlpacaDB/chainer,kuwa32/chainer,hvy/chainer,yanweifu/chainer,ikasumi/chainer,bayerj/chainer,laysakura/chainer,niboshi/chainer,cupy/cupy,t-abe/chainer,chainer/chainer,wavelets/chainer,cemoody/chainer,okuta/chainer,chainer/chainer,keisuke-umezawa/chainer,1986ks/chainer,keisuke-umezawa/chainer,wkentaro/chainer,sou81821/chainer,woodshop/complex-chainer,muupan/chainer,okuta/chainer,niboshi/chainer,sinhrks/chainer,kiyukuta/chainer,hidenori-t/chainer,cupy/cupy,chainer/chainer,sinhrks/chainer,minhpqn/chainer,niboshi/chainer,ronekko/chainer,Kaisuke5/chainer,delta2323/chainer,kashif/chainer,nushio3/chainer,jfsantos/chainer,tigerneil/chainer,wkentaro/chainer,ktnyt/chainer,benob/chainer,tereka114/chainer,muupan/chainer,hvy/chainer,benob/chainer,ttakamura/chainer,tscohen/chainer,jnishi/chainer,pfnet/chainer,ysekky/chainer,aonotas/chainer,okuta/chainer,anaruse/chainer