code: def _score(self, order=4):
      if order != 4:
          raise NotImplementedError
      # tokenization and lowercasing are performed by self.tokenizer instead.
      return self.sacrebleu.corpus_bleu(
          self.pred, [self.ref], tokenize="none"
      )
  
imports: import ctypes
  import math
  import sys
  from dataclasses import dataclass, field
  import torch
  from fairseq.dataclass import FairseqDataclass
  from fairseq.scoring import BaseScorer, register_scorer
  from fairseq.scoring.tokenizer import EvaluationTokenizer
label_desc: Use image node_id 3 for calling the SacrebleuScorer obj's underlying member method code with example usage: obj._score(order) and returns: self