Fix TestRandomSample
Fix TestRandomSample

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