

'''simple docstring'''
import importlib
import sys
from argparse import REMAINDER, ArgumentParser
from pathlib import Path

import torch_xla.distributed.xla_multiprocessing as xmp







def       _A	(			)    ->			List[Any]:
   _lowercase    :   List[str]      =     ArgumentParser(
       description=(
           "PyTorch TPU distributed training launch helper utility that will spawn up multiple distributed processes"
       )  )

   # Optional arguments for the launch helper
   parser.add_argument("--num_cores"	,							type=_A	,							default=1	,							help="Number of TPU cores to use (1 or 8)."  )

   # positional
   parser.add_argument(
       "training_script"	,							type=_A	,							help=(
           "The full path to the single TPU training "
           "program/script to be launched in parallel, "
           "followed by all the arguments for the "
           "training script"
       )	,							)

   # rest from the training program
   parser.add_argument("training_script_args"	,							nargs=_A  )

   return parser.parse_args()







def       _A	(			)    ->			Tuple:
   _lowercase    :   Any      =     parse_args()

   # Import training_script as a module.
   _lowercase    :   List[Any]      =     Path(args.training_script  )
   sys.path.append(str(script_fpath.parent.resolve()  )  )
   _lowercase    :   Optional[Any]      =     script_fpath.stem
   _lowercase    :   int      =     importlib.import_module(_A  )

   # Patch sys.argv
   _lowercase    :   Optional[Any]      =     [args.training_script] + args.training_script_args + ["--tpu_num_cores", str(args.num_cores  )]

   xmp.spawn(mod._mp_fn	,							args=()	,							nprocs=args.num_cores  )


if __name__ == "__main__":
    main()









'''simple docstring'''
from __future__ import annotations

from typing import Generic, TypeVar

_snake_case     						=						TypeVar('T')


class      a__						(							Generic[T]						):


   def __init__(				self    ,       _UpperCamelCase						):





      """simple docstring"""





      _lowercase    :   Any      =     data  # Assign data
      _lowercase    :   Node[T] | None      =     None  # Initialize next as null
      _lowercase    :   Node[T] | None      =     None  # Initialize prev as null




class      a__						(							Generic[T]						):


   def __init__(				self						):





      """simple docstring"""





      _lowercase    :   Node[T] | None      =     None


   def 		_lowerCamelCase     (				self    ,       _UpperCamelCase						):





      """simple docstring"""





      if self.head is None:
         _lowercase    :   Optional[int]      =     Node(_UpperCamelCase						)
      else:
         _lowercase    :   str      =     Node(_UpperCamelCase						)
         _lowercase    :   Optional[Any]      =     new_node
         _lowercase    :   List[str]      =     self.head
         _lowercase    :   Tuple      =     None
         _lowercase    :   Tuple      =     new_node


   def 		_lowerCamelCase     (				self						):





      """simple docstring"""





      if self.head is None:
         return None
      else:
         assert self.head is not None
         _lowercase    :   str      =     self.head.data
         _lowercase    :   Optional[Any]      =     self.head.next
         if self.head is not None:
            _lowercase    :   Optional[int]      =     None
         return temp


   def 		_lowerCamelCase     (				self						):





      """simple docstring"""





      return self.head.data if self.head is not None else None


   def __len__(				self						):





      """simple docstring"""





      _lowercase    :   Optional[Any]      =     self.head
      _lowercase    :   Tuple      =     0
      while temp is not None:
         count += 1
         _lowercase    :   Tuple      =     temp.next
      return count


   def 		_lowerCamelCase     (				self						):





      """simple docstring"""





      return self.head is None






   def 		_lowerCamelCase     (				self						):





      """simple docstring"""





      print("stack elements are:"						)
      _lowercase    :   str      =     self.head
      while temp is not None:
         print(temp.data    ,       end="->"						)
         _lowercase    :   Any      =     temp.next


# Code execution starts here
if __name__ == "__main__":
    # Start with the empty stack
    _snake_case     						=						Stack()

    # Insert 4 at the beginning. So stack becomes 4->None
    print('Stack operations using Doubly LinkedList')
    stack.push(4)

    # Insert 5 at the beginning. So stack becomes 4->5->None
    stack.push(5)

    # Insert 6 at the beginning. So stack becomes 4->5->6->None
    stack.push(6)

    # Insert 7 at the beginning. So stack becomes 4->5->6->7->None
    stack.push(7)

    # Print the stack
    stack.print_stack()

    # Print the top element
    print('\nTop element is ', stack.top())

    # Print the stack size
    print('Size of the stack is ', len(stack))

    # pop the top element
    stack.pop()

    # pop the top element
    stack.pop()

    # two elements have now been popped off
    stack.print_stack()

    # Print True if the stack is empty else False
    print('\nstack is empty:', stack.is_empty())






