code: def __new__(cls) -> "LeafSpec":
      return optree.treespec_leaf(none_is_leaf=True)
  
imports: import functools
  import warnings
  from typing import Any, Callable, Iterable, List, Optional, overload, Tuple, Type, TypeVar, Union
  import torch
  import optree
  from optree import PyTreeSpec
label_desc: Use image node_id 1 for calling the LeafSpec obj's underlying member method code with example usage: obj.__new__(cls) and returns: optree