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# Copyright (c) Facebook, Inc. and its affiliates.
#
# This source code is licensed under the MIT license found in the
# LICENSE file in the root directory of this source tree.
from fairseq.scoring import BaseScorer, register_scorer
@register_scorer("chrf")
class ChrFScorer(BaseScorer):
def __init__(self, args):
super(ChrFScorer, self).__init__(args)
import sacrebleu
self.sacrebleu = sacrebleu
def add_string(self, ref, pred):
self.ref.append(ref)
self.pred.append(pred)
def score(self, order=4):
return self.result_string(order).score
def result_string(self, order=4):
if order != 4:
raise NotImplementedError
return self.sacrebleu.corpus_chrf(self.pred, [self.ref]).format()
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