code: def output_best_scores(self, best_epoch_str: str) -> None:
          
          BEST_SCORES_FILENAME = "best_scores.txt"
          with open(os.path.join(self.exp_dir, BEST_SCORES_FILENAME),
                    "w", encoding=ENCODING) as best_f:
              print(best_epoch_str, file=best_f, flush=True)
docs: Output best scores to the filesystem