The cost of a eliminating a node is the product of weights, domain cardinality,
        of its neighbors.

def cost(self, node):
        """
        The cost of a eliminating a node is the product of weights, domain cardinality,
        of its neighbors.
        """
        return np.prod([self.bayesian_model.get_cardinality(neig_node) for neig_node in
                        self.moralized_model.neighbors(node)])