code: def testBleuWrapper(self):
      hyp_filename, ref_filename = self._generate_test_data(
          "standard",
          ["a b a c", "e f g d"],
          ["a b a z", "y f g d k l m"],
      )
      bleu = bleu_hook.bleu_wrapper(ref_filename, hyp_filename)
      actual_bleu = 0.3436
      self.assertAllClose(bleu, actual_bleu, atol=1e-03)
  
file_path: tensor2tensor/tensor2tensor/utils/bleu_hook_test.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  import tempfile
  import six
  from tensor2tensor.data_generators import text_encoder
  from tensor2tensor.utils import bleu_hook
  import tensorflow.compat.v1
label_desc: Use image node_id 7 for calling the BleuHookTest obj's underlying member method code with example usage: obj.testBleuWrapper() without return types