code: def testDatasetVariantMismatch(self):
      # Use a nested dataset as an example of a variant.
      dataset = dataset_ops.Dataset.from_tensors(
          dataset_ops.Dataset.range(10)
      )
      with self.assertRaises(TypeError):
          dataset = dataset.map(
              lambda x: compression_ops.uncompress(
                  x, dataset.element_spec
              )
          )
          self.getDatasetOutput(dataset)
  
imports: from collections import namedtuple
  from absl.testing import parameterized
  from tensorflow.python.data.experimental.ops import compression_ops
  from tensorflow.python.data.kernel_tests import test_base
  from tensorflow.python.data.ops import dataset_ops
  from tensorflow.python.data.util import structure
  from tensorflow.python.eager import context
  from tensorflow.python.framework import combinations
  from tensorflow.python.framework import errors
  from tensorflow.python.framework import sparse_tensor
  from tensorflow.python.ops.ragged import ragged_factory_ops
  from tensorflow.python.platform import test
label_desc: Use image node_id 7 for calling the CompressionOpsTest obj's underlying member method code with example usage: obj.testDatasetVariantMismatch() without return types