code: def test_namespace_copy():
      ns = Namespace()
      assert copy.copy(ns) == ns
      assert copy.copy(ns) is not ns
  
imports: import copy
  from torch import nn
  from torch.distributed.pipeline.sync.skip import Namespace, skippable, stash
  from torch.testing._internal.common_utils import run_tests
label_desc: Use image node_id 2 for calling a global function with example usage: test_namespace_copy() without return types