code: def from_json(cls, json_info):
          
          if json_info is None:
              return None
          return TrialRecord(
              trial_id=json_info["trial_id"],
              job_id=json_info["job_id"],
              trial_status=json_info["status"],
              start_time=json_info["start_time"],
              params=json_info["params"])
docs: Build a Trial instance from a json string.