



import argparse
import shutil
from pathlib import Path

from tqdm import tqdm

from transformers import AutoTokenizer



def    snake_case_				(    _SCREAMING_SNAKE_CASE  ,	_SCREAMING_SNAKE_CASE  ,	_SCREAMING_SNAKE_CASE  ,	_SCREAMING_SNAKE_CASE=1_0_2_4   ):
	__lowercase		       =			[], []

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

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

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

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



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



def    snake_case_				(    ):
	__lowercase		       =			argparse.ArgumentParser()
	parser.add_argument("--tok_name"  ,	type=UpperCAmelCase__  ,	help="like facebook/bart-large-cnn,t5-base, etc."   )
	parser.add_argument("--max_seq_len"  ,	type=UpperCAmelCase__  ,	default=1_2_8   )
	parser.add_argument("--data_dir"  ,	type=UpperCAmelCase__   )
	parser.add_argument("--save_path"  ,	type=UpperCAmelCase__   )
	__lowercase		       =			parser.parse_args()
	__lowercase		       =			AutoTokenizer.from_pretrained(args.tok_name   )
	return pack_data_dir(UpperCAmelCase__  ,	Path(args.data_dir   )  ,	args.max_seq_len  ,	args.save_path   )


if __name__ == "__main__":
	packer_cli()








from __future__ import annotations

from collections import namedtuple
from dataclasses import dataclass

@dataclass
class   _A   :


						'''simple docstring'''





						_snake_case			:     int
						_snake_case			:     TreeNode | None      							=      None
						_snake_case			:     TreeNode | None      							=      None

snake_case__					:     Dict    		=   namedtuple("""CoinsDistribResult""", """moves excess""")



def    snake_case_				(    _SCREAMING_SNAKE_CASE   ):

	if root is None:
		return 0

	# Validation
	def count_nodes(_SCREAMING_SNAKE_CASE   ) -> int:
		if node is None:
			return 0

		return count_nodes(node.left   ) + count_nodes(node.right   ) + 1

	def count_coins(_SCREAMING_SNAKE_CASE   ) -> int:
		if node is None:
			return 0

		return count_coins(node.left   ) + count_coins(node.right   ) + node.data

	if count_nodes(_SCREAMING_SNAKE_CASE   ) != count_coins(_SCREAMING_SNAKE_CASE   ):
		raise ValueError("The nodes number should be same as the number of coins"   )

	# Main calculation
	def get_distrib(_SCREAMING_SNAKE_CASE   ) -> CoinsDistribResult:

		if node is None:
			return CoinsDistribResult(0  ,	1   )

		__lowercase       ,    __lowercase		       =			get_distrib(node.left   )
		__lowercase       ,    __lowercase		       =			get_distrib(node.right   )

		__lowercase		       =			1 - left_distrib_excess
		__lowercase		       =			1 - right_distrib_excess

		__lowercase		       =			(
		    left_distrib_moves
		    + right_distrib_moves
		    + abs(_SCREAMING_SNAKE_CASE   )
		    + abs(_SCREAMING_SNAKE_CASE   )
		)
		__lowercase		       =			node.data - coins_to_left - coins_to_right

		return CoinsDistribResult(_SCREAMING_SNAKE_CASE  ,	_SCREAMING_SNAKE_CASE   )

	return get_distrib(_SCREAMING_SNAKE_CASE   )[0]


if __name__ == "__main__":
	import doctest

	doctest.testmod()



