





'''simple docstring'''







import os
from argparse import ArgumentParser
from typing import List

import torch.utils.data

from datasets import Dataset, IterableDataset
from datasets.distributed import split_dataset_by_node


SCREAMING_SNAKE_CASE_      =			4
SCREAMING_SNAKE_CASE_      =			3


class  lowerCAmelCase_						(       snake_case__      ):





  """simple docstring"""



  pass




def        __lowercase						(      __SCREAMING_SNAKE_CASE		)				->					Optional[int]:
     """simple docstring"""




     for shard in shards:
          for i in range(__SCREAMING_SNAKE_CASE		):
               yield {"i": i, "shard": shard}




def        __lowercase						(      )				->					Optional[Any]:
     """simple docstring"""




     __a       =   int(os.environ["""RANK"""]		)
     __a       =   int(os.environ["""WORLD_SIZE"""]		)

     __a       =   ArgumentParser()
     parser.add_argument("""--streaming"""				,  type=__SCREAMING_SNAKE_CASE		)
     parser.add_argument("""--local_rank"""				,  type=__SCREAMING_SNAKE_CASE		)
     parser.add_argument("""--num_workers"""				,  type=__SCREAMING_SNAKE_CASE				,  default=0		)
     __a       =   parser.parse_args()
     __a       =   args.streaming
     __a       =   args.num_workers

     __a       =   {"""shards""": [F'''shard_{shard_idx}''' for shard_idx in range(__SCREAMING_SNAKE_CASE		)]}
     __a       =   IterableDataset.from_generator(__SCREAMING_SNAKE_CASE				,  gen_kwargs=__SCREAMING_SNAKE_CASE		)
     if not streaming:
          __a       =   Dataset.from_list(list(__SCREAMING_SNAKE_CASE		)		)

     __a       =   split_dataset_by_node(__SCREAMING_SNAKE_CASE				,  rank=__SCREAMING_SNAKE_CASE				,  world_size=__SCREAMING_SNAKE_CASE		)
     __a       =   torch.utils.data.DataLoader(__SCREAMING_SNAKE_CASE				,  num_workers=__SCREAMING_SNAKE_CASE		)

     __a       =   NUM_SHARDS * NUM_ITEMS_PER_SHARD
     __a       =   full_size // world_size
     expected_local_size += int(rank < (full_size % world_size)		)

     __a       =   sum(1 for _ in dataloader		)
     if local_size != expected_local_size:
          raise FailedTestError(F'''local_size {local_size} != expected_local_size {expected_local_size}'''		)


if __name__ == "__main__":
 main()










'''simple docstring'''







def        __lowercase						(      __SCREAMING_SNAKE_CASE		)				->					bool:
     """simple docstring"""




     __a       =   [int(__SCREAMING_SNAKE_CASE		) for i in ip_va_address.split("""."""		) if i.isdigit()]
     return len(__SCREAMING_SNAKE_CASE		) == 4 and all(0 <= int(__SCREAMING_SNAKE_CASE		) <= 254 for octet in octets		)


if __name__ == "__main__":
 SCREAMING_SNAKE_CASE_      =			input().strip()
 SCREAMING_SNAKE_CASE_      =			'valid' if is_ip_va_address_valid(ip) else 'invalid'
 print(f"""{ip} is a {valid_or_invalid} IP v4 address.""")






