code: def test_unflatten_shared_submodule(self):
      class Shared(torch.nn.Module):
          def __init__(self):
              super().__init__()
              layernorm = torch.nn.LayerNorm(10)
              self.sub_net = torch.nn.Sequential(
                  layernorm,
                  torch.nn.ReLU(),
                  layernorm,
                  torch.nn.ReLU(),
              )
  
          def forward(self, x):
              return self.sub_net(x)
  
      eager_module = Shared()
      inps = (torch.rand(10),)
      export_module = export(eager_module, inps, {})
      unflattened_module = unflatten(export_module)
      self.compare_outputs(eager_module, unflattened_module, inps)
      self.assertTrue(hasattr(unflattened_module, "sub_net"))
      for i in range(len(eager_module.sub_net)):
          self.assertTrue(hasattr(unflattened_module.sub_net, str(i)))
      self.assertEqual(
          id(getattr(unflattened_module.sub_net, "0")),
          id(getattr(unflattened_module.sub_net, "2")),
      )
  
imports: import dataclasses
  import unittest
  from contextlib import contextmanager
  from dataclasses import dataclass
  from typing import List, Any
  import torch
  import torch._dynamo
  from functorch.experimental.control_flow import cond, map
  from torch import Tensor
  from torch.export import Constraint, Dim, dynamic_dim, export, unflatten, FlatArgsAdapter
  from torch.export._trace import DEFAULT_EXPORT_DYNAMO_CONFIG
  from torch._export import capture_pre_autograd_graph
  from torch._export.utils import get_buffer, get_param, is_buffer, is_param, register_dataclass_as_pytree_node
  from torch.export import Constraint, Dim, export
  from torch.fx.experimental.proxy_tensor import make_fx
  from torch.testing import FileCheck
  from torch.testing._internal.common_utils import run_tests, TestCase
  from torch.utils._pytree import LeafSpec, tree_flatten, tree_unflatten, TreeSpec, treespec_dumps, treespec_loads
label_desc: Use image node_id 5 for calling the TestUnflatten obj's underlying member method code with example usage: obj.test_unflatten_shared_submodule() and returns: self