code: def from_json(cls, json_info):
          
          if json_info is None:
              return None
          return ResultRecord(
              trial_id=json_info["trial_id"],
              timesteps_total=json_info["timesteps_total"],
              done=json_info.get("done", None),
              episode_reward_mean=json_info.get("episode_reward_mean", None),
              mean_accuracy=json_info.get("mean_accuracy", None),
              mean_loss=json_info.get("mean_loss", None),
              trainning_iteration=json_info.get("training_iteration", None),
              timesteps_this_iter=json_info.get("timesteps_this_iter", None),
              time_this_iter_s=json_info.get("time_this_iter_s", None),
              time_total_s=json_info.get("time_total_s", None),
              date=json_info.get("date", None),
              hostname=json_info.get("hostname", None),
              node_ip=json_info.get("node_ip", None),
              config=json_info.get("config", None))
docs: Build a Result instance from a json string.