code: def setUp(self):
      super(MultiMeshTest, self).setUp()
      self.first_mesh = _ONE_D_CPU_MESH
      if test_util.is_tpu_present():
          self.second_mesh = _ONE_D_TPU_MESH
      elif test_util.is_gpu_present():
          self.second_mesh = _ONE_D_GPU_MESH
      else:
          self.second_mesh = _ONE_D_CPU_MESH_Y
  
      device_type = config.preferred_device_type()
      if device_type != "TPU":
          test_util.reset_logical_devices(device_type, 2)
      accelerator_util.initialize_accelerator_system(device_type)
  
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 1 for calling the MultiMeshTest obj's underlying member method code with example usage: obj.setUp() without return types