code: def testUnaryElementwiseOpsPreserveUniformRowLength(self):
      # Unary elementwise op
      rt = ragged_tensor.RaggedTensor.from_uniform_row_length(
          ragged_factory_ops.constant([[1, 2], [3]]),
          uniform_row_length=2,
      )
      self.assertAllEqual(
          rt.uniform_row_length,
          array_ops.zeros_like(rt).uniform_row_length,
      )
  
      # Unary-list elementwise op
      rt = ragged_tensor.RaggedTensor.from_uniform_row_length(
          ragged_factory_ops.constant([[1, 2], [3]]),
          uniform_row_length=2,
      )
      self.assertAllEqual(
          rt.uniform_row_length,
          math_ops.add_n([rt, rt]).uniform_row_length,
      )
  
imports: from absl.testing import parameterized
  import numpy
  from tensorflow.python import tf2
  from tensorflow.python.eager import context
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import errors
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import random_seed
  from tensorflow.python.framework import sparse_tensor
  from tensorflow.python.framework import tensor
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import array_ops_stack
  from tensorflow.python.ops import check_ops
  from tensorflow.python.ops import clip_ops
  from tensorflow.python.ops import data_flow_ops
  from tensorflow.python.ops import image_ops_impl
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops import nn_impl
  from tensorflow.python.ops import nn_ops
  from tensorflow.python.ops import string_ops
  from tensorflow.python.ops import variables
  from tensorflow.python.ops.ragged import ragged_dispatch
  from tensorflow.python.ops.ragged import ragged_factory_ops
  from tensorflow.python.ops.ragged import ragged_tensor
  from tensorflow.python.ops.ragged import ragged_tensor_test_ops
  from tensorflow.python.ops.ragged.dynamic_ragged_shape import DynamicRaggedShape
  from tensorflow.python.platform import googletest
  from tensorflow.python.util import dispatch
  from tensorflow.python.util import nest
label_desc: Use image node_id 14 for calling the RaggedDispatchTest obj's underlying member method code with example usage: obj.testUnaryElementwiseOpsPreserveUniformRowLength() without return types