Given a dictionary of edges (edge id -> feature list), add all of
        these to the CoNetwork object

def _augment_network(self, edge_dict):
        """Given a dictionary of edges (edge id -> feature list), add all of
        these to the CoNetwork object
        """
        for (vertex0, vertex1), feature_list in edge_dict.items():
            edge_obj = Edge(vertex0, vertex1, feature_list)
            self.edges[(vertex0, vertex1)] = edge_obj
            self._add_edge_to_vertex(vertex0, edge_obj)
            self._add_edge_to_vertex(vertex1, edge_obj)