code: def testRegroupKeepsDictBasedClass(self):
      class DictBasedClass(dict):
          """Dummy class inherited from a dict."""
  
      result = distribute_utils.regroup(
          (
              DictBasedClass(a="a1", b="b1"),
              DictBasedClass(a="a2", b="b2"),
          )
      )
      self.assertIsInstance(result, DictBasedClass)
      self._is_per_replica(result["a"], ["a1", "a2"])
      self._is_per_replica(result["b"], ["b1", "b2"])
  
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 3 for calling the RegroupAndSelectDeviceTest obj's underlying member method code with example usage: obj.testRegroupKeepsDictBasedClass() without return types