XGBShareableHeader
XGBShareableHeader.RANK_MAP
XGBShareableHeader.WORLD_SIZE
XGBShareableHeader.XGB_FL_SERVER_PORT
XGBShareableHeader.XGB_FL_SERVER_SECURE
XGBFedController
XGBFedController.control_flow()
XGBFedController.process_result_of_unknown_task()
XGBFedController.start_controller()
XGBFedController.stop_controller()