code: def testIdentityCanCopy(self):
      config.set_device_policy("explicit")
      with ops.device("CPU:0"):
          x = constant_op.constant(1.0)
          self.assertIn("CPU:0", x.device)
          self.assertIn("CPU:0", x.backing_device)
      with ops.device("GPU:0"):
          y = array_ops.identity(x)
          self.assertIn("GPU:0", y.device)
          self.assertIn("GPU:0", y.backing_device)
  
imports: from absl.testing import parameterized
  from tensorflow.python.eager import context
  from tensorflow.python.eager import def_function
  from tensorflow.python.eager import remote
  from tensorflow.python.eager import test
  from tensorflow.python.framework import config
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import errors
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops import random_ops
label_desc: Use image node_id 2 for calling the HardDevicePlacementTest obj's underlying member method code with example usage: obj.testIdentityCanCopy() without return types