code: def test_no_skippables():
      p1 = nn.Sequential(Pass())
      p2 = nn.Sequential(Pass())
  
      layout = inspect_skip_layout([p1, p2])
      policy = [list(layout.copy_policy(i)) for i in range(2)]
  
      assert policy == [[], []]
  
imports: from torch import nn
  from torch.distributed.pipeline.sync.skip import Namespace, pop, skippable, stash
  from torch.distributed.pipeline.sync.skip.layout import inspect_skip_layout
  from torch.testing._internal.common_utils import run_tests
label_desc: Use image node_id 1 for calling a global function with example usage: test_no_skippables() without return types