code: def testFillString(self):
      with test_util.force_cpu():
          values = constant_op.constant(
              ["a", "c", "e", "g", "b", "d", "f", "h"],
              dtype=dtypes.string,
          )
          default_value = constant_op.constant("x", dtype=dtypes.string)
          ragged_input = ragged_tensor.RaggedTensor.from_row_lengths(
              values=values, row_lengths=[0, 4, 0, 4, 0]
          )
          (
              ragged_output,
              empty_row_indicator,
          ) = ragged_array_ops.fill_empty_rows(
              ragged_input, default_value
          )
  
          self.assertAllEqual(
              ragged_output.row_lengths(), [1, 4, 1, 4, 1]
          )
          self.assertAllEqual(
              ragged_output.values,
              [
                  b"x",
                  b"a",
                  b"c",
                  b"e",
                  b"g",
                  b"x",
                  b"b",
                  b"d",
                  b"f",
                  b"h",
                  b"x",
              ],
          )
          self.assertAllEqual(
              empty_row_indicator,
              np.array([1, 0, 1, 0, 1]).astype(np.bool_),
          )
  
file_path: tensorflow-upstream/tensorflow/python/ops/ragged/ragged_fill_empty_rows_op_test.py
imports: import numpy
  from tensorflow.python.eager import def_function
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import gradient_checker
  from tensorflow.python.ops.ragged import ragged_array_ops
  from tensorflow.python.ops.ragged import ragged_factory_ops
  from tensorflow.python.ops.ragged import ragged_tensor
  from tensorflow.python.platform import googletest
label_desc: Use image node_id 4 for calling the RaggedFillEmptyRowsTest obj's underlying member method code with example usage: obj.testFillString() without return types