code: def bleu(refs, preds):
      """
      Returns `t5` style BLEU scores. See the related implementation:
      https://github.com/google-research/text-to-text-transfer-transformer/blob/3d10afd51ba97ac29eb66ae701eca274488202f7/t5/evaluation/metrics.py#L41
  
      :param refs:
          A `list` of `list` of reference `str`s.
      :param preds:
          A `list` of predicted `str`s.
      """
      score = sacrebleu.corpus_bleu(
          preds,
          refs,
          smooth_method="exp",
          smooth_value=0.0,
          force=False,
          lowercase=False,
          tokenize="intl",
          use_effective_order=False,
      ).score
      return score
  
imports: import os
  import pathlib
  import re
  import collections
  import functools
  import inspect
  import sys
  from typing import List, Union
  import torch
  from omegaconf import OmegaConf
  import sacrebleu
  from rouge_score import rouge_scorer, scoring
label_desc: Use image node_id 13 for calling a global function with example usage: bleu(refs, preds) and returns: score