Fix argmin/argmax
Fix argmin/argmax

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