code: def result_string(self, order=4):
      if order != 4:
          raise NotImplementedError
      return self.sacrebleu.corpus_chrf(self.pred, [self.ref]).format()
  
file_path: fairseq/fairseq/scoring/chrf.py
imports: from dataclasses import dataclass
  from fairseq.dataclass import FairseqDataclass
  from fairseq.scoring import BaseScorer, register_scorer
label_desc: Use image node_id 4 for calling the ChrFScorer obj's underlying member method code with example usage: obj.result_string(order) and returns: self