def ordered_indices(self):
        """Return an ordered list of indices. Batches will be constructed based
        on this order."""
        if self.shuffle:
            order = [np.random.permutation(len(self))]
        else:
            order = [np.arange(len(self))]
        order.append(self.sizes)
        return np.lexsort(order)
Return an ordered list of indices. Batches will be constructed based
        on this order.
edgelm/fairseq/data/subsample_dataset.py