code: def setUp(self):
      super(ExponentialSmoothingTest, self).setUp()
      self.sample_input = [
          ("Hello", "en"),
          (",", "en"),
          ("world", "en"),
          ("!", "en"),
          ("Bonjour", "fr"),
          (".", "fr"),
      ]
      self.coeffs = [{"en": 0.75, "fr": 1.5}]
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import collections
  import logging
  import tempfile
  from absl.testing import absltest
  import apache_beam
  from apache_beam.testing.test_pipeline import TestPipeline
  from apache_beam.testing.util import assert_that
  from apache_beam.testing.util import equal_to
  import tensorflow.compat.v1
  from tensorflow_text.tools.wordpiece_vocab import utils
label_desc: Use image node_id 1 for calling the ExponentialSmoothingTest obj's underlying member method code with example usage: obj.setUp() without return types