<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def initialize_model(self, root_node):
 """ Initializes the Model using given root node. :param root_node: Graph root node. :type root_node: DefaultNode :return: Method success :rtype: bool """


        LOGGER.debug("> Initializing model with '{0}' root node.".format(root_node))

        self.beginResetModel()
        self.root_node = root_node
        self.enable_model_triggers(True)
        self.endResetModel()
        return True