




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

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

_SCREAMING_SNAKE_CASE			=						TypeVar("T")
_SCREAMING_SNAKE_CASE			=						TypeVar("U")
class   __UpperCAmelCase				(     Generic[T, U]				):



					'''simple docstring'''





					def __init__(	self     :						Optional[Any]      ,       _lowercase     :						List[str]      ,       _lowercase     :						Any)    ->							str:
								A_									= key
								A_									= val
								A_									= None
								A_									= None



					def __repr__(	self     :						List[Any])    ->							str:
								return (
								    F'Node: key: {self.key}, val: {self.val}, '
								    F'has next: {bool(self.next)}, has prev: {bool(self.prev)}'
								)





class   __UpperCAmelCase				(     Generic[T, U]				):



					'''simple docstring'''





					def __init__(	self     :						Any)    ->							None:
								A_									= DoubleLinkedListNode(A_      ,       A_)
								A_									= DoubleLinkedListNode(A_      ,       A_)
								A_		, A_									= self.rear, self.head



					def __repr__(	self     :						Union[str, Any])    ->							str:
								A_									= ['DoubleLinkedList']
								A_									= self.head
								while node.next is not None:
											rep.append(str(A_))
											A_									= node.next
								rep.append(str(self.rear))
								return ",\n    ".join(A_)



					def     __snake_case						(	self     :						Optional[Any]      ,       _lowercase     :						int)    ->							None:
								A_									= self.rear.prev

								# All nodes other than self.head are guaranteed to have non-None previous
								assert previous is not None

								A_									= node
								A_									= previous
								A_									= node
								A_									= self.rear



					def     __snake_case						(	self     :						Any      ,       _lowercase     :						Union[str, Any])    ->							DoubleLinkedListNode[T, U] | None:

								if node.prev is None or node.next is None:
											return None

								A_									= node.next
								A_									= node.prev
								A_									= None
								A_									= None
								return node





class   __UpperCAmelCase				(     Generic[T, U]				):



					'''simple docstring'''





					_UpperCamelCase							=		{}



					def __init__(	self     :						Optional[Any]      ,       _lowercase     :						Dict)    ->							Tuple:
								A_									= DoubleLinkedList()
								A_									= capacity
								A_									= 0
								A_									= 0
								A_									= 0
								A_									= {}



					def __repr__(	self     :						Tuple)    ->							str:
								return (
								    F'CacheInfo(hits={self.hits}, misses={self.miss}, '
								    F'capacity={self.capacity}, current size={self.num_keys})'
								)



					def __contains__(	self     :						Optional[Any]      ,       _lowercase     :						Optional[Any])    ->							bool:
								return key in self.cache



					def     __snake_case						(	self     :						str      ,       _lowercase     :						List[Any])    ->							U | None:
								# Note: pythonic interface would throw KeyError rather than return None

								if key in self.cache:
											self.hits += 1
											A_									= self.cache[key]
											A_									= self.list.remove(self.cache[key])
											assert node == value_node

											# node is guaranteed not None because it is in self.cache
											assert node is not None
											self.list.add(A_)
											return node.val
								self.miss += 1
								return None



					def     __snake_case						(	self     :						List[Any]      ,       _lowercase     :						Optional[Any]      ,       _lowercase     :						str)    ->							None:

								if key not in self.cache:
											if self.num_keys >= self.capacity:
														# delete first node (oldest) when over capacity
														A_									= self.list.head.next

														# guaranteed to have a non-None first node when num_keys > 0
														# explain to type checker via assertions
														assert first_node is not None
														assert first_node.key is not None
														assert (
														    self.list.remove(A_) is not None
														)  # node guaranteed to be in list assert node.key is not None

														del self.cache[first_node.key]
														self.num_keys -= 1
											A_									= DoubleLinkedListNode(A_      ,       A_)
											self.list.add(self.cache[key])
											self.num_keys += 1

								else:
											# bump node to the end of the list, update value
											A_									= self.list.remove(self.cache[key])
											assert node is not None  # node guaranteed to be in list
											A_									= value
											self.list.add(A_)



					@classmethod
					def     __snake_case						(	cls     :						List[Any]      ,       _lowercase     :						Dict = 128)    ->							Callable[[Callable[[T], U]], Callable[..., U]]:

								def cache_decorator_inner(_lowercase     :						Any) -> Callable[..., U]:
											def cache_decorator_wrapper(*_lowercase     :						str) -> U:
														if func not in cls.decorator_function_to_instance_map:
																	A_									= LRUCache(A_)

														A_									= cls.decorator_function_to_instance_map[func].get(args[0])
														if result is None:
																	A_									= func(*A_)
																	cls.decorator_function_to_instance_map[func].put(args[0]      ,       A_)
														return result

											def cache_info() -> LRUCache[T, U]:
														return cls.decorator_function_to_instance_map[func]

											setattr(A_      ,       'cache_info'      ,       A_)  # noqa: B010

											return cache_decorator_wrapper

								return cache_decorator_inner


if __name__ == "__main__":
							import doctest

							doctest.testmod()











import argparse
import shutil
from pathlib import Path

from tqdm import tqdm

from transformers import AutoTokenizer






def 				_UpperCAmelCase			(    A				,							A				,							A				,							A=1024     ):




   '''simple docstring'''

   UpperCAmelCase__			,							UpperCAmelCase__						=[], []

   UpperCAmelCase__						=list(zip(A				,							A     )     )
   UpperCAmelCase__			,							UpperCAmelCase__						=sorted_examples[0]

   def is_too_big(A     ):
      return tok(A				,							return_tensors="pt"     ).input_ids.shape[1] > max_tokens

   for src, tgt in tqdm(sorted_examples[1:]     ):
      UpperCAmelCase__						=new_src + " " + src
      UpperCAmelCase__						=new_tgt + " " + tgt
      if is_too_big(A     ) or is_too_big(A     ):  # cant fit, finalize example
         finished_src.append(A     )
         finished_tgt.append(A     )
         UpperCAmelCase__			,							UpperCAmelCase__						=src, tgt
      else:  # can fit, keep adding
         UpperCAmelCase__			,							UpperCAmelCase__						=cand_src, cand_tgt

    # cleanup
   if new_src:
      assert new_tgt
      finished_src.append(A     )
      finished_tgt.append(A     )
   return finished_src, finished_tgt






def 				_UpperCAmelCase			(    A				,							A				,							A				,							A     ):




   '''simple docstring'''

   UpperCAmelCase__						=Path(A     )
   save_path.mkdir(exist_ok=A     )
   for split in ["train"]:
      UpperCAmelCase__			,							UpperCAmelCase__						=data_dir / F"""{split}.source""", data_dir / F"""{split}.target"""
      UpperCAmelCase__						=[x.rstrip() for x in Path(A     ).open().readlines()]
      UpperCAmelCase__						=[x.rstrip() for x in Path(A     ).open().readlines()]
      UpperCAmelCase__			,							UpperCAmelCase__						=pack_examples(A				,							A				,							A				,							A     )
      print(F"""packed {split} split from {len(A     )} examples -> {len(A     )}."""     )
      Path(save_path / F"""{split}.source"""     ).open("w"     ).write("\n".join(A     )     )
      Path(save_path / F"""{split}.target"""     ).open("w"     ).write("\n".join(A     )     )
   for split in ["val", "test"]:
      UpperCAmelCase__			,							UpperCAmelCase__						=data_dir / F"""{split}.source""", data_dir / F"""{split}.target"""
      shutil.copyfile(A				,							save_path / F"""{split}.source"""     )
      shutil.copyfile(A				,							save_path / F"""{split}.target"""     )






def 				_UpperCAmelCase			(    ):




   '''simple docstring'''

   UpperCAmelCase__						=argparse.ArgumentParser()
   parser.add_argument("--tok_name"				,							type=A				,							help="like facebook/bart-large-cnn,t5-base, etc."     )
   parser.add_argument("--max_seq_len"				,							type=A				,							default=128     )
   parser.add_argument("--data_dir"				,							type=A     )
   parser.add_argument("--save_path"				,							type=A     )
   UpperCAmelCase__						=parser.parse_args()
   UpperCAmelCase__						=AutoTokenizer.from_pretrained(args.tok_name     )
   return pack_data_dir(A				,							Path(args.data_dir     )				,							args.max_seq_len				,							args.save_path     )


if __name__ == "__main__":
    packer_cli()



