code: def __instancecheck__(self, instance: object) -> bool:
      return isinstance(instance, TreeSpec) and instance.is_leaf()
  
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 LeafSpecMeta obj's underlying member method code with example usage: obj.__instancecheck__(instance) and returns: unknown