code: def testMultiMeshAdd(self):
      a = constant_op.constant(1, dtype=dtypes.int32)
      b = constant_op.constant(2, dtype=dtypes.int32)
      with ops.device_v2(api.device_name()):
          first_mesh_a = api.copy_to_mesh(
              a, Layout.replicated(self.first_mesh, rank=0)
          )
          first_mesh_b = api.copy_to_mesh(
              b, Layout.replicated(self.first_mesh, rank=0)
          )
      # Copy-to-mesh doesn't work with multi-mesh as we always broadcast to
      # default mesh.
      # TODO(hthu): Use copy-to-mesh after the generic Relayout CL is in.
      second_mesh_a = api.copy_to_mesh(
          np.ones([3], dtype=np.int32),
          Layout.replicated(self.second_mesh, rank=1),
      )
      second_mesh_b = api.copy_to_mesh(
          np.zeros([3], dtype=np.int32),
          Layout.replicated(self.second_mesh, rank=1),
      )
  
      first_mesh_result = first_mesh_a + first_mesh_b
      second_mesh_result = second_mesh_a + second_mesh_b
      self.assertDTensorEqual(
          np.asarray(3, dtype=np.int32),
          Layout.replicated(self.first_mesh, rank=0),
          first_mesh_result,
      )
      self.assertDTensorEqual(
          np.ones([3], dtype=np.int32),
          Layout.replicated(self.second_mesh, rank=1),
          second_mesh_result,
      )
  
imports: from absl.testing import parameterized
  import numpy
  from tensorflow.dtensor.python import accelerator_util
  from tensorflow.dtensor.python import api
  from tensorflow.dtensor.python import config
  from tensorflow.dtensor.python import d_variable
  from tensorflow.dtensor.python import layout
  from tensorflow.dtensor.python.tests import test_util
  from tensorflow.python.eager import backprop
  from tensorflow.python.eager import context
  from tensorflow.python.eager.polymorphic_function import polymorphic_function
  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 ops
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import gen_math_ops
  from tensorflow.python.ops import math_ops
  from tensorflow.python.platform import test
label_desc: Use image node_id 8 for calling the MultiMeshTest obj's underlying member method code with example usage: obj.testMultiMeshAdd() without return types