def download(self):
        r"""Automatically download data and extract it."""
        tgz_path = os.path.join(self.raw_dir, self.name + ".tgz")
        download(self.url, path=tgz_path)
        extract_archive(tgz_path, self.raw_path)
Automatically download data and extract it.
python/dgl/data/knowledge_graph.py