code: def test_average_word_heuristic_empty_input(self):
      self.assertFalse(
          nlsg.AverageWordHeuristicNLClassifier().classify("")
      )
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from absl.testing import absltest
  import pyarrow
  from tensorflow_data_validation.statistics.generators import natural_language_domain_inferring_stats_generator
  from tensorflow_data_validation.utils import test_util
  from typing import Text
  from tensorflow_metadata.proto.v0 import statistics_pb2
label_desc: Use image node_id 2 for calling the NaturalLanguageStatsGeneratorTest obj's underlying member method code with example usage: obj.test_average_word_heuristic_empty_input() without return types