code: def testMostSpecificCommonSupertypeNone(self, v1, v2):
      self.assertIsNone(v1.most_specific_common_supertype([v2]))
      self.assertIsNone(v2.most_specific_common_supertype([v1]))
  
imports: import functools
  import os
  from absl import flags
  from absl.testing import parameterized
  import tensorflow.compat.v2
  from tensorflow_probability.python.bijectors import bijector
  from tensorflow_probability.python.bijectors import reshape
  from tensorflow_probability.python.bijectors import scale
  from tensorflow_probability.python.bijectors import shift
  from tensorflow_probability.python.bijectors import transform_diagonal
  from tensorflow_probability.python.distributions import independent
  from tensorflow_probability.python.distributions import normal
  from tensorflow_probability.python.distributions import transformed_distribution
  from tensorflow_probability.python.experimental.distributions import mvn_precision_factor_linop
  from tensorflow_probability.python.internal import auto_composite_tensor
  from tensorflow_probability.python.internal import tensor_util
  from tensorflow_probability.python.internal import test_util
  from absl.testing import absltest
label_desc: Use image node_id 6 for calling the AutoCompositeTensorTypeSpecTest obj's underlying member method code with example usage: obj.testMostSpecificCommonSupertypeNone(v1, v2) without return types