code: def test_rouge_variants(self):
      mean_result = metrics.rouge_mean(self.targets, self.predictions)
      self.assertDictClose(
          mean_result, self.expected_bootstrap_result, delta=_DELTA
      )
  
file_path: text-to-text-transfer-transformer/t5/evaluation/scoring_test.py
imports: import json
  import os
  from absl.testing import absltest
  from t5.evaluation import metrics
  from t5.evaluation import test_utils
label_desc: Use image node_id 2 for calling the ScoringTest obj's underlying member method code with example usage: obj.test_rouge_variants() without return types