code: def testCommunicativity(self):
      with DtypeConversionTestEnv("all"):
          for v1 in _ALL_INPUT_TYPES:
              for v2 in _ALL_INPUT_TYPES:
                  self.assertEqual(
                      flexible_dtypes.result_type(v1, v2),
                      flexible_dtypes.result_type(v2, v1),
                  )
  
imports: from absl.testing import parameterized
  import numpy
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import extension_type
  from tensorflow.python.framework import flexible_dtypes
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import tensor
  from tensorflow.python.framework import weak_tensor
  from tensorflow.python.ops import variables
  from tensorflow.python.ops import weak_tensor_test_util
  from tensorflow.python.platform import test
label_desc: Use image node_id 21 for calling the DtypesUtilTest obj's underlying member method code with example usage: obj.testCommunicativity() without return types