code: def testDocStringExample(self):
      gathered = pointer_ops.gather_with_default(
          ["a", "b", "c", "d"], [2, 0, -1, 2, -1], "_"
      )
      self.assertAllEqual(gathered, [b"c", b"a", b"_", b"c", b"_"])
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from absl.testing import parameterized
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import errors
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.platform import test
  from tensorflow_text.python.ops import pointer_ops
label_desc: Use image node_id 1 for calling the GatherWithDefaultOpTest obj's underlying member method code with example usage: obj.testDocStringExample() without return types