code: def _create_trial_info(self, expr_dir):
          
          meta = self._build_trial_meta(expr_dir)
  
          self.logger.debug("Create trial for %s" % meta)
  
          trial_record = TrialRecord.from_json(meta)
          trial_record.save()
docs: Create information for given trial.
  
          Meta file will be loaded if exists, and the trial information
          will be saved in db backend.
  
          Args:
              expr_dir (str): Directory path of the experiment.