Remove redundant argument from check_len
Remove redundant argument from check_len

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