code: def testStringSplit(self):
      strings = ["pigs on the wing", "animals"]
  
      with self.cached_session():
          tokens = string_ops.string_split(strings)
          indices, values, shape = self.evaluate(tokens)
          self.assertAllEqual(
              indices, [[0, 0], [0, 1], [0, 2], [0, 3], [1, 0]]
          )
          self.assertAllEqual(
              values, [b"pigs", b"on", b"the", b"wing", b"animals"]
          )
          self.assertAllEqual(shape, [2, 4])
  
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 errors_impl
  from tensorflow.python.framework import sparse_tensor
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import string_ops
  from tensorflow.python.ops.ragged import ragged_factory_ops
  from tensorflow.python.ops.ragged import ragged_string_ops
  from tensorflow.python.platform import test
  from tensorflow.python.util import compat
label_desc: Use image node_id 1 for calling the StringSplitOpTest obj's underlying member method code with example usage: obj.testStringSplit() without return types