def add_edge(self, graph_edge):
        """Adds an edge object to the graph.

        It takes a edge object as its only argument and returns
        None.
        """
        if not isinstance(graph_edge, Edge):
            raise TypeError(
                "add_edge() received a non edge class object: " + str(graph_edge)
            )

        edge_points = (graph_edge.get_source(), graph_edge.get_destination())

        if edge_points in self.obj_dict["edges"]:
            edge_list = self.obj_dict["edges"][edge_points]
            edge_list.append(graph_edge.obj_dict)
        else:
            self.obj_dict["edges"][edge_points] = [graph_edge.obj_dict]

        graph_edge.set_sequence(self.get_next_sequence_number())
        graph_edge.set_parent_graph(self.get_parent_graph())
Adds an edge object to the graph.

        It takes a edge object as its only argument and returns
        None.
        
python/aitemplate/utils/visualization/pydot.py