Fix max, min, argmax and argmin
Fix max, min, argmax and argmin

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