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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def load(cls, graph, element):
 """ Instantiates the node in the graph if it's not already stored in the graph :param graph: The dependency graph this node is a member of :type graph: corenlp_xml.dependencies.DependencyGraph :param element: The lxml element wrapping the node :type element: lxml.ElementBase """

        node = graph.get_node_by_idx(id(element.get("idx")))
        if node is None:
            node = cls(graph, element)
            graph.register_node(node)
        return node