code: def testMirroredContainer(self, distribution):
      with distribution.scope():
          v = variable_v1.VariableV1(
              1.0, aggregation=variable_scope.VariableAggregation.SUM
          )
      self.assertTrue(distribute_utils.is_distributed_variable(v))
      self.assertTrue(
          distribute_utils.is_distributed_variable(
              distribute_utils.regroup(v.values)
          )
      )
  
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 7 for calling the RegroupAndSelectDeviceTest obj's underlying member method code with example usage: obj.testMirroredContainer(distribution) without return types