code: def testSameId(self):
      foo = object()
      result = distribute_utils.regroup((("a", foo), ("b", foo)))
      self.assertIsInstance(result, tuple)
      self.assertLen(result, 2)
      self._is_per_replica(result[0], ["a", "b"])
      self.assertIs(foo, result[1])
  
      # Test select_replica(), should undo the merge done by regroup().
      result_0 = distribute_utils.select_replica(0, result)
      self.assertIsInstance(result_0, tuple)
      self.assertLen(result_0, 2)
      self.assertEqual("a", result_0[0])
      self.assertIs(foo, result_0[1])
      result_1 = distribute_utils.select_replica(1, result)
      self.assertIsInstance(result_1, tuple)
      self.assertLen(result_1, 2)
      self.assertEqual("b", result_1[0])
      self.assertIs(foo, result_1[1])
  
imports: import collections
  import collections.abc
  from absl.testing import parameterized
  import wrapt
  from tensorflow.python.distribute import combinations
  from tensorflow.python.distribute import distribute_utils
  from tensorflow.python.distribute import strategy_combinations
  from tensorflow.python.distribute import values
  from tensorflow.python.eager import context
  from tensorflow.python.eager import test
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import ops
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import variable_scope
  from tensorflow.python.ops import variable_v1
  from tensorflow.python.saved_model.model_utils import mode_keys
label_desc: Use image node_id 8 for calling the RegroupAndSelectDeviceTest obj's underlying member method code with example usage: obj.testSameId() without return types