Fix split for numpy 1.9
Fix split for numpy 1.9

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