fix SacrebleuScorer.score()

Summary: fix SacrebleuScorer.score()

Reviewed By: sravyapopuri388

Differential Revision: D33311843

fbshipit-source-id: 8536baceab6ef2e7c9c4a9a8a005abaa6a9229f0

Author: kahne

fairseq/scoring/bleu.py

@@ -59,16 +59,17 @@ def add_string(self, ref, pred):
         self.ref.append(self.tokenizer.tokenize(ref))
         self.pred.append(self.tokenizer.tokenize(pred))
 
-    def score(self, order=4):
-        return self.result_string(order).score
-
-    def result_string(self, order=4):
+    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"
-        ).format()
+        return self.sacrebleu.corpus_bleu(self.pred, [self.ref], tokenize="none")
+
+    def score(self, order=4):
+        return self._score(order).score
+
+    def result_string(self, order=4):
+        return self._score(order).format()
 
 
 @dataclass