docstr: This points to a .py file that configures everything about the RL job.
  It can be overridden at runtime by specifying the RLCOACH_PRESET hyperparameter.
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code: def default_preset_name(self):
      """This points to a .py file that configures everything about the RL job.
      It can be overridden at runtime by specifying the RLCOACH_PRESET hyperparameter.
      """
      return "preset-cartpole-dqn"
  
imports: from sagemaker_rl.coach_launcher import SageMakerCoachPresetLauncher
label_desc: Use image node_id 1 for calling the MyLauncher obj's underlying member method code with example usage: obj.default_preset_name() and returns: str