Fix weight_decay
Fix weight_decay

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