code: def setUp(self):
      super(DTensorDeviceCacheTest, self).setUp()
      device_ids = test_util.create_device_ids_array((2,))
      local_device_ids = np.ravel(device_ids).tolist()
      mesh_dict = {
          device: Mesh(
              [_BATCH_DIM],
              device_ids,
              local_device_ids,
              test_util.create_device_list((2,), device),
          )
          for device in ("CPU", "GPU", "TPU")
      }
      self.mesh = self.configTestMesh(mesh_dict)
  
imports: import gc
  import numpy
  from tensorflow.dtensor.python import api
  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.polymorphic_function import polymorphic_function
  from tensorflow.python.framework import combinations
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import gen_stateless_random_ops
  from tensorflow.python.ops import math_ops
  from tensorflow.python.platform import test
label_desc: Use image node_id 1 for calling the DTensorDeviceCacheTest obj's underlying member method code with example usage: obj.setUp() without return types