code: def testConcat(self):
      ds1 = dataset_ops.Dataset.range(10)
      ds2 = dataset_ops.Dataset.range(10)
      ds = ds1.concatenate(ds2)
      variant_tensor_ops = traverse.obtain_all_variant_tensor_ops(ds)
      self.assertSetEqual(
          set(["ConcatenateDataset", "RangeDataset", "RangeDataset_1"]),
          set(x.name for x in variant_tensor_ops),
      )
  
imports: from absl.testing import parameterized
  from tensorflow.python.compat import compat
  from tensorflow.python.data.experimental.ops import data_service_ops
  from tensorflow.python.data.kernel_tests import test_base
  from tensorflow.python.data.ops import dataset_ops
  from tensorflow.python.data.util import traverse
  from tensorflow.python.framework import combinations
  from tensorflow.python.ops import gen_dataset_ops
  from tensorflow.python.ops import math_ops
  from tensorflow.python.platform import test
label_desc: Use image node_id 3 for calling the TraverseTest obj's underlying member method code with example usage: obj.testConcat() without return types