code: def testGetVariables(self):
      means_var, variances_var = self._tensor_normalizer.variables
      self.assertAllEqual(
          means_var.shape.as_list(), self._tensor_spec.shape.as_list()
      )
      self.assertAllEqual(
          variances_var.shape.as_list(),
          self._tensor_spec.shape.as_list(),
      )
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import functools
  from absl.testing import parameterized
  import numpy
  import tensorflow
  from tf_agents.specs import tensor_spec
  from tf_agents.utils import tensor_normalizer
label_desc: Use image node_id 2 for calling the EMATensorNormalizerTest obj's underlying member method code with example usage: obj.testGetVariables() without return types