code: def setUp(self):
      super(DTensorBatchParallelSPMDTest, self).setUp()
  
      self.skipForDeviceType(
          ["TPU"],
          "all tests require 8 TPU cores.",
          unless_device_count_equals_to=8,
      )
      # Builds a 8x2 mesh.
      self._mesh_dim_b = "b"
      self._mesh_dim_x = "x"
      self._dims = [self._mesh_dim_b, self._mesh_dim_x]
  
      global_ids = test_util.create_device_ids_array((4, 2))
      local_ids = np.ravel(global_ids).tolist()
      mesh_dict = {
          device: Mesh(
              self._dims,
              global_ids,
              local_ids,
              test_util.create_device_list((4, 2), device),
          )
          for device in ("CPU", "GPU", "TPU")
      }
      self.mesh = self.configTestMesh(mesh_dict)
      context.ensure_initialized()
  
      # Creates a bunch of common layouts used by tests later.
      # 4-d
      self.replicated_layout_4d = Layout.replicated(self.mesh, rank=4)
      self.batch_layout_4d = Layout.batch_sharded(
          self.mesh, self._mesh_dim_b, rank=4
      )
  
      # 5-d
      self.replicated_layout_5d = Layout.replicated(self.mesh, rank=5)
      self.batch_layout_5d = Layout.batch_sharded(
          self.mesh, self._mesh_dim_b, rank=5
      )
  
imports: import itertools
  from absl.testing import parameterized
  import numpy
  from tensorflow.dtensor.python import api
  from tensorflow.dtensor.python import layout
  from tensorflow.dtensor.python import numpy_util
  from tensorflow.dtensor.python.tests import test_util
  from tensorflow.dtensor.python.tests import test_util_ops
  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 ops
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import gen_array_ops
  from tensorflow.python.ops import gen_image_ops
  from tensorflow.python.ops import gen_linalg_ops
  from tensorflow.python.ops import nn_impl
  from tensorflow.python.ops import nn_ops
  from tensorflow.python.platform import test
label_desc: Use image node_id 1 for calling the DTensorBatchParallelSPMDTest obj's underlying member method code with example usage: obj.setUp() without return types