code: def worker(self):
      # train tasks by other progress or machines for multiprocessing
      print("========== worker ==========")
      if isinstance(self.trainer, TrainerRM):
          for task in self.tasks + self.add_tasks:
              name_id = task["model"]["class"]
              self.trainer.worker(experiment_name=name_id)
      else:
          print(f"{type(self.trainer)} is not supported for worker.")
  
file_path: qlib/examples/online_srv/rolling_online_management.py
imports: import os
  import fire
  import qlib
  from qlib.model.trainer import DelayTrainerR, DelayTrainerRM, TrainerR, TrainerRM, end_task_train, task_train
  from qlib.workflow import R
  from qlib.workflow.online.strategy import RollingStrategy
  from qlib.workflow.task.gen import RollingGen
  from qlib.workflow.online.manager import OnlineManager
  from qlib.tests.config import CSI100_RECORD_XGBOOST_TASK_CONFIG_ROLLING, CSI100_RECORD_LGB_TASK_CONFIG_ROLLING
  from qlib.workflow.task.manage import TaskManager
label_desc: Use image node_id 2 for calling the RollingOnlineExample obj's underlying member method code with example usage: obj.worker() without return types