code: def _open_top_level_list_if_single_element(
      spec: pytree.TreeSpec,
  ) -> pytree.TreeSpec:
      if spec.type == list and spec.num_children == 1:
          return spec.children_specs[0]
      return spec
  
imports: from __future__ import annotations
  import inspect
  from typing import Any, Callable, List, Mapping, Optional, Protocol, runtime_checkable, Sequence, Tuple, Union
  import torch
  import torch.export
  from torch.onnx._internal import _beartype
  from torch.utils import _pytree
label_desc: Use image node_id 2 for calling a global function with example usage: _open_top_level_list_if_single_element(spec) and returns: spec, spec