Avoid numpy.stack which is supported in NumPy 1.10
Avoid numpy.stack which is supported in NumPy 1.10

rezoo/chainer,pfnet/chainer,aonotas/chainer,wkentaro/chainer,jnishi/chainer,ronekko/chainer,jnishi/chainer,okuta/chainer,keisuke-umezawa/chainer,niboshi/chainer,wkentaro/chainer,chainer/chainer,niboshi/chainer,wkentaro/chainer,keisuke-umezawa/chainer,chainer/chainer,hvy/chainer,tkerola/chainer,ktnyt/chainer,keisuke-umezawa/chainer,anaruse/chainer,jnishi/chainer,keisuke-umezawa/chainer,chainer/chainer,hvy/chainer,chainer/chainer,niboshi/chainer,okuta/chainer,okuta/chainer,hvy/chainer,ktnyt/chainer,ktnyt/chainer,ktnyt/chainer,wkentaro/chainer,okuta/chainer,hvy/chainer,niboshi/chainer,jnishi/chainer