Remove redundant default values
Remove redundant default values

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