code: def testPackedVariable(self):
      with ops.device("/cpu:0"):
          v0 = resource_variable_ops.ResourceVariable(1.0, name="var0")
      with ops.device("/cpu:1"):
          v1 = resource_variable_ops.ResourceVariable(2.0, name="var1")
  
      packed_var = (
          packed_distributed_variable.PackedDistributedVariable(
              [v0, v1]
          )
      )
      self.assertFalse(packed_var.handle.is_packed)
      self.assertTrue(packed_var.is_initialized)
  
      with ops.device("/cpu:0"):
          self.assertAllEqual(
              packed_var.get_var_on_current_device(), v0
          )
          val0 = packed_var.assign(2.0).assign_add(1.0)
          self.assertAllEqual(val0, 3.0)
  
      with ops.device("/cpu:1"):
          self.assertAllEqual(
              packed_var.get_var_on_current_device(), v1
          )
          val0 = packed_var.assign(2.0).assign_add(1.0)
          self.assertAllEqual(val0, 3.0)
  
      @def_function.function
      def update_var():
          self.assertTrue(packed_var.handle.is_packed)
          with ops.device("/cpu:0"):
              packed_var.assign_add(3.0).assign_sub(1.0)
              read0 = packed_var.value()
          with ops.device("/cpu:1"):
              packed_var.assign_sub(4.0).assign_sub(2.0)
              read1 = packed_var.value()
  
          return read0, read1
  
      self.assertAllEqual(update_var(), (5.0, -3.0))
  
file_path: tensorflow/tensorflow/python/distribute/packed_distributed_variable_test.py
imports: from tensorflow.python.distribute import device_util
  from tensorflow.python.distribute import packed_distributed_variable
  from tensorflow.python.eager import context
  from tensorflow.python.eager import def_function
  from tensorflow.python.framework import config
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops import resource_variable_ops
  from tensorflow.python.platform import test
label_desc: Use image node_id 2 for calling the PackedDistributedVariableTest obj's underlying member method code with example usage: obj.testPackedVariable() and returns: read0,  read1