def METHOD_NAME(self, cwd, if_save):
    """
    save or load training files for Agent
    :param cwd: Current Working Directory. ElegantRL save training files in CWD.
    :param if_save: True: save files. False: load files.
    """
    for i in range(self.n_agents):
        self.agents[i].METHOD_NAME(cwd + "/" + str(i), if_save)