def has_cache(self):
        """check whether there are processed data in `self.save_path`"""
        graph_path = os.path.join(
            self.save_path, self.name + "_dgl_graph_{}.bin".format(self.hash)
        )
        return os.path.exists(graph_path)
check whether there are processed data in `self.save_path`
python/dgl/data/fraud.py