code: def testCacheWithVariable(self):
      c0 = api.copy_to_mesh(
          constant_op.constant(1.0),
          Layout.replicated(self.mesh, rank=0),
      )
      c1 = api.copy_to_mesh(
          constant_op.constant([2.0, 3.0]),
          Layout.replicated(self.mesh, rank=1),
      )
      a = constant_op.constant([4.0])
      b = constant_op.constant([5.0])
      c2 = api.pack(
          [a, b],
          layout=Layout.batch_sharded(self.mesh, _BATCH_DIM, rank=1),
      )
  
      v0 = d_variable.DVariable(c0)
      v1 = d_variable.DVariable(c1)
      v2 = d_variable.DVariable(c2)
  
      self.assertAllEqual(v0.read_value(), 1.0)
      self.assertAllEqual(v1.read_value(), [2.0, 3.0])
      unpacked_tensor = api.unpack(v2.read_value())
      self.assertAllClose([4.0], unpacked_tensor[0])
      self.assertAllClose([5.0], unpacked_tensor[1])
  
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 6 for calling the DTensorDeviceCacheTest obj's underlying member method code with example usage: obj.testCacheWithVariable() without return types