code: def get_bleu_scorer(
      cls, tokenizer="13a", lowercase=False, char_level=False
  ):
      scorer_args = {
          "sacrebleu_tokenizer": tokenizer,
          "sacrebleu_lowercase": lowercase,
          "sacrebleu_char_level": char_level,
      }
      return SacrebleuScorer(Namespace(**scorer_args))
  
imports: from argparse import Namespace
  import os
  import re
  import unittest
  from pathlib import Path
  from tqdm import tqdm
  from typing import List, Dict, Optional
  import torch
  from fairseq.checkpoint_utils import load_model_ensemble_and_task
  from fairseq.scoring.wer import WerScorer
  from fairseq.scoring.bleu import SacrebleuScorer
  from fairseq import utils
  import zipfile
label_desc: Use image node_id 11 for calling the TestFairseqSpeech obj's underlying member method code with example usage: obj.get_bleu_scorer(cls, tokenizer, lowercase, char_level) and returns: SacrebleuScorer