code: def __str__(self):
      return "Id: {}, trial_id: {}, training_step: {}, objective_value: {}".format(
          self.id,
          self.trial_id,
          self.training_step,
          self.objective_value,
      )
  
file_path: advisor/advisor_client/advisor_client/model.py
imports: import six
label_desc: Use image node_id 2 for calling the TrialMetric obj's underlying member method code with example usage: obj.__str__() and returns: str