

'''simple docstring'''





import os
from shutil import copyfile
from typing import List, Optional, Tuple

from ...tokenization_utils_fast import PreTrainedTokenizerFast
from ...utils import is_sentencepiece_available, logging


if is_sentencepiece_available():
							from .tokenization_pegasus import PegasusTokenizer
else:
							UpperCamelCase_    						=       None


UpperCamelCase_    						=       logging.get_logger(__name__)


UpperCamelCase_    						=       """▁"""

UpperCamelCase_    						=       {"""vocab_file""": """spiece.model""", """tokenizer_file""": """tokenizer.json"""}

UpperCamelCase_    						=       {
    """vocab_file""": {"""google/pegasus-xsum""": """https://huggingface.co/google/pegasus-xsum/resolve/main/spiece.model"""},
    """tokenizer_file""": {
        """google/pegasus-xsum""": """https://huggingface.co/google/pegasus-xsum/resolve/main/tokenizer.json"""
    },
}

UpperCamelCase_    						=       {
    """google/pegasus-xsum""": 512,
}





class 		__SCREAMING_SNAKE_CASE							(			lowercase__      ):
				lowerCamelCase_		       =    VOCAB_FILES_NAMES
				lowerCamelCase_		       =    PRETRAINED_VOCAB_FILES_MAP
				lowerCamelCase_		       =    PRETRAINED_POSITIONAL_EMBEDDINGS_SIZES
				lowerCamelCase_		       =    PegasusTokenizer
				lowerCamelCase_		       =    ['input_ids', 'attention_mask']







				def __init__(       self     :		Tuple		,					UpperCAmelCase__     :		Optional[int]=None		,					UpperCAmelCase__     :		Optional[Any]=None		,					UpperCAmelCase__     :		Optional[Any]="<pad>"		,					UpperCAmelCase__     :		Any="</s>"		,					UpperCAmelCase__     :		List[str]="<unk>"		,					UpperCAmelCase__     :		Dict="<mask_2>"		,					UpperCAmelCase__     :		str="<mask_1>"		,					UpperCAmelCase__     :		Optional[int]=None		,					UpperCAmelCase__     :		Optional[Any]=103		,					**UpperCAmelCase__     :		int		,					):
										'''simple docstring'''
										lowercase :							Dict    		=offset

										if additional_special_tokens is not None:
																if not isinstance(UpperCAmelCase__		,					UpperCAmelCase__   ):
																						raise TypeError(
																						    F'''additional_special_tokens should be of type {type(UpperCAmelCase__   )}, but is'''
																						    F''' {type(UpperCAmelCase__   )}'''   )

																lowercase :							List[Any]    		=(
																    ([mask_token_sent] + additional_special_tokens)
																    if mask_token_sent not in additional_special_tokens and mask_token_sent is not None
																    else additional_special_tokens
																)
																# fill additional tokens with ..., <unk_token_102> in case not all additional tokens are already taken
																additional_special_tokens_extended += [
																    F'''<unk_{i}>''' for i in range(len(UpperCAmelCase__   )		,					self.offset - 1   )
																]

																if len(set(UpperCAmelCase__   )   ) != len(UpperCAmelCase__   ):
																						raise ValueError(
																						    '''Please make sure that the provided additional_special_tokens do not contain an incorrectly'''
																						    F''' shifted list of <unk_x> tokens. Found {additional_special_tokens_extended}.'''   )
																lowercase :							Optional[int]    		=additional_special_tokens_extended
										else:
																lowercase :							List[Any]    		=[mask_token_sent] if mask_token_sent is not None else []
																additional_special_tokens += [F'''<unk_{i}>''' for i in range(2		,					self.offset   )]

										super().__init__(
										    UpperCAmelCase__		,					tokenizer_file=UpperCAmelCase__		,					pad_token=UpperCAmelCase__		,					eos_token=UpperCAmelCase__		,					unk_token=UpperCAmelCase__		,					mask_token=UpperCAmelCase__		,					mask_token_sent=UpperCAmelCase__		,					offset=UpperCAmelCase__		,					additional_special_tokens=UpperCAmelCase__		,					**UpperCAmelCase__		,					)
										lowercase :							Tuple    		=vocab_file
										lowercase :							Optional[int]    		=False if not self.vocab_file else True







				def  lowerCamelCase_	(       self     :		Optional[int]		,					UpperCAmelCase__     :		Tuple   ):
										'''simple docstring'''
										lowercase :							Union[str, Any]    		=set(self.all_special_ids   )  # call it once instead of inside list comp
										all_special_ids.remove(self.unk_token_id   )  # <unk> is only sometimes special

										if all_special_ids != set(range(len(self.additional_special_tokens   ) + 3   )   ):
																raise ValueError(
																    '''There should be 3 special tokens: mask_token, pad_token, and eos_token +'''
																    F''' {len(self.additional_special_tokens   )} additional_special_tokens, but got {all_special_ids}'''   )

										return [1 if x in all_special_ids else 0 for x in seq]







				def  lowerCamelCase_	(       self     :		Optional[Any]		,					UpperCAmelCase__     :		List		,					UpperCAmelCase__     :		Optional[List] = None		,					UpperCAmelCase__     :		bool = False   ):
										'''simple docstring'''
										if already_has_special_tokens:
																return self._special_token_mask(UpperCAmelCase__   )
										elif token_ids_a is None:
																return self._special_token_mask(UpperCAmelCase__   ) + [1]
										else:
																return self._special_token_mask(token_ids_a + token_ids_a   ) + [1]







				def  lowerCamelCase_	(       self     :		Optional[int]		,					UpperCAmelCase__     :		Dict		,					UpperCAmelCase__     :		Optional[Any]=None   ):
										'''simple docstring'''
										if token_ids_a is None:
																return token_ids_a + [self.eos_token_id]
										# We don't expect to process pairs, but leave the pair logic for API consistency
										return token_ids_a + token_ids_a + [self.eos_token_id]







				def  lowerCamelCase_	(       self     :		Union[str, Any]		,					UpperCAmelCase__     :		str		,					UpperCAmelCase__     :		Optional[str] = None   ):
										'''simple docstring'''
										if not self.can_save_slow_tokenizer:
																raise ValueError(
																    '''Your fast tokenizer does not have the necessary information to save the vocabulary for a slow '''
																    '''tokenizer.'''   )

										if not os.path.isdir(UpperCAmelCase__   ):
																logger.error(F'''Vocabulary path ({save_directory}) should be a directory'''   )
																return
										lowercase :							Tuple    		=os.path.join(
										    UpperCAmelCase__		,					(filename_prefix + '''-''' if filename_prefix else '''''') + VOCAB_FILES_NAMES['''vocab_file''']   )

										if os.path.abspath(self.vocab_file   ) != os.path.abspath(UpperCAmelCase__   ):
																copyfile(self.vocab_file		,					UpperCAmelCase__   )

										return (out_vocab_file,)








'''simple docstring'''





from collections import defaultdict






def 				_lowerCAmelCase			(   __magic_name__						:     int						)				->  int:
						lowercase :							Optional[Any]    		=1
						lowercase :							Union[str, Any]    		=True
						for v in tree[start]:
												if v not in visited:
																		ret += dfs(__magic_name__						)
						if ret % 2 == 0:
												cuts.append(__magic_name__						)
						return ret






def 				_lowerCAmelCase			(   )				->  int:
						dfs(1						)


if __name__ == "__main__":
							UpperCamelCase_						,   UpperCamelCase_    						=       10, 9
							UpperCamelCase_    						=       defaultdict(list)
							UpperCamelCase_    						=       {}
							UpperCamelCase_    						=       []
							UpperCamelCase_    						=       0
							UpperCamelCase_    						=       [(2, 1), (3, 1), (4, 3), (5, 2), (6, 1), (7, 2), (8, 6), (9, 8), (10, 8)]
							for u, v in edges:
														tree[u].append(v)
														tree[v].append(u)
							even_tree()
							print(len(cuts) - 1)





