Remove redundant keyword argument
Remove redundant keyword argument

ktnyt/chainer,niboshi/chainer,keisuke-umezawa/chainer,tkerola/chainer,niboshi/chainer,okuta/chainer,rezoo/chainer,hvy/chainer,ktnyt/chainer,delta2323/chainer,wkentaro/chainer,cupy/cupy,cupy/cupy,aonotas/chainer,okuta/chainer,niboshi/chainer,okuta/chainer,chainer/chainer,ysekky/chainer,keisuke-umezawa/chainer,wkentaro/chainer,hvy/chainer,kiyukuta/chainer,jnishi/chainer,pfnet/chainer,okuta/chainer,hvy/chainer,ktnyt/chainer,chainer/chainer,kashif/chainer,keisuke-umezawa/chainer,cupy/cupy,jnishi/chainer,niboshi/chainer,wkentaro/chainer,keisuke-umezawa/chainer,jnishi/chainer,chainer/chainer,ronekko/chainer,jnishi/chainer,ktnyt/chainer,chainer/chainer,anaruse/chainer,cupy/cupy,hvy/chainer,wkentaro/chainer