
"""simple docstring"""



import fcntl
import os
import socket

import torch
import torch.distributed as dist






def 	__snake_case  (    *SCREAMING_SNAKE_CASE:					int						):






							"""simple docstring"""



							with open(SCREAMING_SNAKE_CASE     ,  'r'						) as fh:
														fcntl.flock(SCREAMING_SNAKE_CASE     ,  fcntl.LOCK_EX						)
														try:
																					print(*SCREAMING_SNAKE_CASE						)
														finally:
																					fcntl.flock(SCREAMING_SNAKE_CASE     ,  fcntl.LOCK_UN						)


_snake_case          = int(os.environ['''LOCAL_RANK'''])
torch.cuda.set_device(local_rank)
_snake_case          = torch.device('''cuda''', local_rank)
_snake_case          = socket.gethostname()

_snake_case          = f'[{hostname}-{local_rank}]'

try:
	# test distributed
	dist.init_process_group('''nccl''')
	dist.all_reduce(torch.ones(1).to(device), op=dist.ReduceOp.SUM)
	dist.barrier()

	# test cuda is available and can allocate memory
	torch.cuda.is_available()
	torch.ones(1).cuda(local_rank)

	# global rank
	_snake_case          = dist.get_rank()
	_snake_case          = dist.get_world_size()

	printflock(f'{gpu} is OK (global rank: {rank}/{world_size})')

	dist.barrier()
	if rank == 0:
		printflock(f'pt={torch.__version__}, cuda={torch.version.cuda}, nccl={torch.cuda.nccl.version()}')

except Exception:
	printflock(f'{gpu} is broken')
	raise








"""simple docstring"""



def 	__snake_case  (    SCREAMING_SNAKE_CASE:					str						):






							"""simple docstring"""



							_lowerCAmelCase  	=			0

							# if input_string is "aba" than new_input_string become "a|b|a"
							_lowerCAmelCase  	=			''
							_lowerCAmelCase  	=			''

							# append each character + "|" in new_string for range(0, length-1)
							for i in input_string[: len(SCREAMING_SNAKE_CASE						) - 1]:
														new_input_string += i + "|"
							# append last character
							new_input_string += input_string[-1]

							# we will store the starting and ending of previous furthest ending palindromic
							# substring
							_lowerCAmelCase	,		_lowerCAmelCase  	=			0, 0

							# length[i] shows the length of palindromic substring with center i
							_lowerCAmelCase  	=			[1 for i in range(len(SCREAMING_SNAKE_CASE						)						)]

							# for each character in new_string find corresponding palindromic string
							_lowerCAmelCase  	=			0
							for j in range(len(SCREAMING_SNAKE_CASE						)						):
														_lowerCAmelCase  	=			1 if j > r else min(length[l + r - j] // 2     ,  r - j + 1						)
														while (
														    j - k >= 0
														    and j + k < len(SCREAMING_SNAKE_CASE						)
														    and new_input_string[k + j] == new_input_string[j - k]
														):
																					k += 1

														_lowerCAmelCase  	=			2 * k - 1

														# does this string is ending after the previously explored end (that is r) ?
														# if yes the update the new r to the last index of this
														if j + k - 1 > r:
																					_lowerCAmelCase  	=			j - k + 1  # noqa: E741
																					_lowerCAmelCase  	=			j + k - 1

														# update max_length and start position
														if max_length < length[j]:
																					_lowerCAmelCase  	=			length[j]
																					_lowerCAmelCase  	=			j

    # create that string
							_lowerCAmelCase  	=			new_input_string[start - max_length // 2 : start + max_length // 2 + 1]
							for i in s:
														if i != "|":
																					output_string += i

							return output_string


if __name__ == "__main__":
	import doctest

	doctest.testmod()






