class_docstr: Test class with extra transform stats generator related functionality.
code: def setUp(self):
      super(TransformStatsGeneratorTest, self).setUp()
      self.maxDiff = None
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import traceback
  from typing import Callable, Dict, Iterable, List, Optional, Tuple, Union
  from absl.testing import absltest
  import apache_beam
  from apache_beam.testing import util
  import pyarrow
  from tensorflow_data_validation import types
  from tensorflow_data_validation.statistics.generators import stats_generator
  from tensorflow.python.util.protobuf import compare
  from tensorflow_metadata.proto.v0 import statistics_pb2
label_desc: Use image node_id 1 for calling the TransformStatsGeneratorTest obj's underlying member method code with example usage: obj.setUp() without return types