code: def testCardinality(self):
      ds = dataset_ops.Dataset.range(10).ignore_errors()
      self.assertEqual(
          self.evaluate(ds.cardinality()), dataset_ops.UNKNOWN
      )
  
imports: import os
  import sys
  from absl.testing import parameterized
  import numpy
  from tensorflow.python.data.kernel_tests import checkpoint_test_base
  from tensorflow.python.data.kernel_tests import test_base
  from tensorflow.python.data.ops import dataset_ops
  from tensorflow.python.data.ops import options
  from tensorflow.python.data.ops import readers
  from tensorflow.python.framework import combinations
  from tensorflow.python.framework import errors
  from tensorflow.python.lib.io import python_io
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import io_ops
  from tensorflow.python.platform import test
  from tensorflow.python.util import compat
label_desc: Use image node_id 7 for calling the IgnoreErrorsTest obj's underlying member method code with example usage: obj.testCardinality() without return types