code: def __repr__(self) -> str:
      return "*"
  
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 _DummyLeaf obj's underlying member method code with example usage: obj.__repr__() and returns: str