Use unsafe casting rule in reduction function
Use unsafe casting rule in reduction function

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