def METHOD_NAME(self):
    """Initialize values in the node-state grid.
    This method should be overridden. The default is random "on" and "off".
    """
    num_states = 2
    for i in range(self.grid.number_of_nodes):
        self.grid.at_node["node_state"][i] = random.randint(num_states)
    return self.grid.at_node["node_state"]