"""simple docstring"""




from __future__ import annotations

from collections.abc import Iterator
from typing import Generic, TypeVar

_a      :		Optional[Any]           =   TypeVar('T')
class 						__A							( Generic[T]		):






     def __init__(		self				,     a__  ):
       _lowerCAmelCase						:       Optional[Any]  			=     data
       _lowerCAmelCase						:       Node[T] | None  			=     None






     def __str__(		self  ):
       return F"{self.data}"







class 						__A							( Generic[T]		):






     def __init__(		self  ):
       _lowerCAmelCase						:       Node[T] | None  			=     None






     def __iter__(		self  ):
       _lowerCAmelCase						:       List[Any]  			=     self.top
       while node:
         yield node.data
         _lowerCAmelCase						:       Dict  			=     node.next






     def __str__(		self  ):
       return "->".join([str(a__  ) for item in self]  )






     def __len__(		self  ):
       return len(tuple(iter(self  )  )  )






     def     __A  (		self  ):
       return self.top is None






     def     __A  (		self				,     a__  ):
       _lowerCAmelCase						:       str  			=     Node(a__  )
       if not self.is_empty():
         _lowerCAmelCase						:       int  			=     self.top
       _lowerCAmelCase						:       List[str]  			=     node






     def     __A  (		self  ):
       if self.is_empty():
         raise IndexError("""pop from empty stack"""  )
       assert isinstance(self.top				,     a__  )
       _lowerCAmelCase						:       Optional[Any]  			=     self.top
       _lowerCAmelCase						:       Optional[Any]  			=     self.top.next
       return pop_node.data






     def     __A  (		self  ):
       if self.is_empty():
         raise IndexError("""peek from empty stack"""  )

       assert self.top is not None
       return self.top.data






     def     __A  (		self  ):
       _lowerCAmelCase						:       List[str]  			=     None


if __name__ == "__main__":
     from doctest import testmod

     testmod()





from packaging import version

from .import_utils import is_accelerate_available


if is_accelerate_available():
					import accelerate
def       A	(    _lowercase						):
						if not is_accelerate_available():
												return method
						SCREAMING_SNAKE_CASE							:    int							=							version.parse(accelerate.__version__						).base_version
						if version.parse(_lowercase						) < version.parse('''0.17.0'''						):
												return method

						def wrapper(self		,  *_lowercase		,  **_lowercase						):
												if hasattr(self		,  '''_hf_hook'''						) and hasattr(self._hf_hook		,  '''pre_forward'''						):
																		self._hf_hook.pre_forward(self						)
												return method(self		,  *_lowercase		,  **_lowercase						)

						return wrapper





