code: def test_score(self):
      bleu_scorer = BleuScorer(tokens_to_ignore={"<end>", "<unk>"})
  
      text_preprocessed = ("", "this is a test")
      pred = "this is a test"
      score = bleu_scorer(
          {
              "preprocessed_text": text_preprocessed,
              "predicted_text": pred,
          }
      )
      self.assertAlmostEqual(1, score, 5)
  
      text_preprocessed = ("", "this is a test")
      pred = "this is a test <end>"
      score = bleu_scorer(
          {
              "preprocessed_text": text_preprocessed,
              "predicted_text": pred,
          }
      )
      self.assertAlmostEqual(1, score, 5)
  
      text_preprocessed = (
          "",
          "it is a guide to action which ensures that the military "
          "always obeys the commands of the party",
      )
      pred = (
          "it is a guide to action that ensures that the military will "
          "forever <unk> <unk> <unk> heed Party commands <end>"
      )
      score = bleu_scorer(
          {
              "preprocessed_text": text_preprocessed,
              "predicted_text": pred,
          }
      )
      self.assertAlmostEqual(0.4138, score, 3)
  
imports: import unittest
  from headliner.evaluation.bleu_scorer import BleuScorer
label_desc: Use image node_id 1 for calling the TestBleuScorer obj's underlying member method code with example usage: obj.test_score() without return types