code: def testCopyToMeshOneToOneSharded(self, is_eager):
      if not test_util.is_tpu_present():
          self.skipForDeviceType(
              ["CPU"], "Need at least one device mesh for this test."
          )
  
      replicated_layout = Layout.replicated(self.first_mesh, rank=1)
      first_layout = Layout([_MESH_DIM_X], self.first_mesh)
      second_layout = Layout([_MESH_DIM_X], self.second_mesh)
  
      numpy_value = np.zeros([8], dtype=np.int32)
      dt_value = api.copy_to_mesh(numpy_value, replicated_layout)
      self.assertDTensorEqual(numpy_value, replicated_layout, dt_value)
  
      def fn(val):
          dt_source = api.relayout(val, first_layout)
          dt_target = api.copy_to_mesh(dt_source, second_layout)
          return dt_source, dt_target
  
      if not is_eager:
          fn = polymorphic_function.function(fn)
  
      dt_source, dt_target = fn(dt_value)
      self.assertDTensorEqual(numpy_value, first_layout, dt_source)
      self.assertDTensorEqual(numpy_value, second_layout, dt_target)
  
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 3 for calling the MultiMeshTest obj's underlying member method code with example usage: obj.testCopyToMeshOneToOneSharded(is_eager) and returns: dt_source,  dt_target