Write the bipartite attribute graph to a file.

        :param str path: Path to the output file.

def write_attribute_adj_list(self, path):
        """Write the bipartite attribute graph to a file.

        :param str path: Path to the output file.
        """
        att_mappings = self.get_attribute_mappings()

        with open(path, mode="w") as file:
            for k, v in att_mappings.items():
                print("{} {}".format(k, " ".join(str(e) for e in v)), file=file)