code: def setUp(self):
      super(DTensorVariableTest, self).setUp()
      mesh_dict = {
          "CPU": _ONE_D_CPU_MESH,
          "GPU": _ONE_D_GPU_MESH,
          "TPU": _ONE_D_TPU_MESH,
      }
      self.mesh = self.configTestMesh(mesh_dict)
      self._replicated_layout = Layout(
          [UNSHARDED, UNSHARDED], self.mesh
      )
      self._one_d_replicated_layout = Layout([UNSHARDED], self.mesh)
      self._scalar_replicated_layout = Layout([], self.mesh)
      self._one_d_shard_layout = Layout([_MESH_DIM_X], self.mesh)
      self._first_d_shard_layout = Layout(
          [_MESH_DIM_X, UNSHARDED], self.mesh
      )
  
imports: 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 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 array_ops_stack
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops import variables
  from tensorflow.python.platform import test
label_desc: Use image node_id 1 for calling the DTensorVariableTest obj's underlying member method code with example usage: obj.setUp() without return types