code: def testWrapAListOfTwoTuples(self):
      result = distribute_utils.regroup([("1", "2"), ("3", "4")])
      self.assertIsInstance(result, tuple)
      self.assertLen(result, 2)
      self._is_per_replica(result[0], ("1", "3"), values.PerReplica)
      self._is_per_replica(result[1], ("2", "4"), values.PerReplica)
  
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 6 for calling the RegroupAndSelectDeviceTest obj's underlying member method code with example usage: obj.testWrapAListOfTwoTuples() without return types