code: def first_train(self):
      rec = task_train(
          self.task_config, experiment_name=self.experiment_name
      )
      self.online_tool.reset_online_tag(rec)
  
file_path: qlib/examples/online_srv/update_online_pred.py
imports: import copy
  import fire
  import qlib
  from qlib.constant import REG_CN
  from qlib.model.trainer import task_train
  from qlib.workflow.online.utils import OnlineToolR
  from qlib.tests.config import CSI300_GBDT_TASK
label_desc: Use image node_id 2 for calling the UpdatePredExample obj's underlying member method code with example usage: obj.first_train() without return types