code: 
  import datasets
  
  from .evaluate import (
      apply_no_ans_threshold,
      find_all_best_thresh,
      get_raw_scores,
      make_eval_dict,
      make_qid_to_has_ans,
      merge_eval,
  )
  
  
  snake_case				:	Tuple							   =						"\\n@inproceedings{Rajpurkar2016SQuAD10,\n  title={SQuAD: 100, 000+ Questions for Machine Comprehension of Text},\n  author={Pranav Rajpurkar and Jian Zhang and Konstantin Lopyrev and Percy Liang},\n  booktitle={EMNLP},\n  year={2016}\n}\n"
  
  snake_case				:	Union[str, Any]							   =						"\nThis metric wrap the official scoring script for version 2 of the Stanford Question\nAnswering Dataset (SQuAD).\n\nStanford Question Answering Dataset (SQuAD) is a reading comprehension dataset, consisting of questions posed by\ncrowdworkers on a set of Wikipedia articles, where the answer to every question is a segment of text, or span,\nfrom the corresponding reading passage, or the question might be unanswerable.\n\nSQuAD2.0 combines the 100,000 questions in SQuAD1.1 with over 50,000 unanswerable questions\nwritten adversarially by crowdworkers to look similar to answerable ones.\nTo do well on SQuAD2.0, systems must not only answer questions when possible, but also\ndetermine when no answer is supported by the paragraph and abstain from answering.\n"
  
  snake_case				:	int							   =						"\nComputes SQuAD v2 scores (F1 and EM).\nArgs:\n    predictions: List of triple for question-answers to score with the following elements:\n        - the question-answer 'id' field as given in the references (see below)\n        - the text of the answer\n        - the probability that the question has no answer\n    references: List of question-answers dictionaries with the following key-values:\n            - 'id': id of the question-answer pair (see above),\n            - 'answers': a list of Dict {'text': text of the answer as a string}\n    no_answer_threshold: float\n        Probability threshold to decide that a question has no answer.\nReturns:\n    'exact': Exact match (the normalized answer exactly match the gold answer)\n    'f1': The F-score of predicted tokens versus the gold answer\n    'total': Number of score considered\n    'HasAns_exact': Exact match (the normalized answer exactly match the gold answer)\n    'HasAns_f1': The F-score of predicted tokens versus the gold answer\n    'HasAns_total': Number of score considered\n    'NoAns_exact': Exact match (the normalized answer exactly match the gold answer)\n    'NoAns_f1': The F-score of predicted tokens versus the gold answer\n    'NoAns_total': Number of score considered\n    'best_exact': Best exact match (with varying threshold)\n    'best_exact_thresh': No-answer probability threshold associated to the best exact match\n    'best_f1': Best F1 (with varying threshold)\n    'best_f1_thresh': No-answer probability threshold associated to the best F1\nExamples:\n\n    >>> predictions = [{'prediction_text': '1976', 'id': '56e10a3be3433e1400422b22', 'no_answer_probability': 0.}]\n    >>> references = [{'answers': {'answer_start': [97], 'text': ['1976']}, 'id': '56e10a3be3433e1400422b22'}]\n    >>> squad_v2_metric = datasets.load_metric(\"squad_v2\")\n    >>> results = squad_v2_metric.compute(predictions=predictions, references=references)\n    >>> print(results)\n    {'exact': 100.0, 'f1': 100.0, 'total': 1, 'HasAns_exact': 100.0, 'HasAns_f1': 100.0, 'HasAns_total': 1, 'best_exact': 100.0, 'best_exact_thresh': 0.0, 'best_f1': 100.0, 'best_f1_thresh': 0.0}\n"
  
  
  
  
  
  @datasets.utils.file_utils.add_start_docstrings(_DESCRIPTION       ,		_KWARGS_DESCRIPTION       )
  class    _snake_case      (  datasets.Metric       ):
  
  
  
  
  
  
  
  			def     SCREAMING_SNAKE_CASE					(       self	):
  				return datasets.MetricInfo(
  				    description=_DESCRIPTION		,     citation=_CITATION		,     inputs_description=_KWARGS_DESCRIPTION		,     features=datasets.Features(
  				        {
  				            "predictions": {
  				                "id": datasets.Value("string"	),
  				                "prediction_text": datasets.Value("string"	),
  				                "no_answer_probability": datasets.Value("float32"	),
  				            },
  				            "references": {
  				                "id": datasets.Value("string"	),
  				                "answers": datasets.features.Sequence(
  				                    {"text": datasets.Value("string"	), "answer_start": datasets.Value("int32"	)}	),
  				            },
  				        }	)		,     codebase_urls=["https://rajpurkar.github.io/SQuAD-explorer/"]		,     reference_urls=["https://rajpurkar.github.io/SQuAD-explorer/"]		,     )
  
  
  
  
  
  
  
  			def     SCREAMING_SNAKE_CASE					(       self		,     _a		,     _a		,     _a=1.0	):
  				__magic_name__	:	str			     =  {p["id"]: p["no_answer_probability"] for p in predictions}
  				__magic_name__	:	Union[str, Any]			     =  [{"paragraphs": [{"qas": references}]}]
  				__magic_name__	:	Optional[int]			     =  {p["id"]: p["prediction_text"] for p in predictions}
  
  				__magic_name__	:	Dict			     =  make_qid_to_has_ans(_a	)  # maps qid to True/False
  				__magic_name__	:	str			     =  [k for k, v in qid_to_has_ans.items() if v]
  				__magic_name__	:	Dict			     =  [k for k, v in qid_to_has_ans.items() if not v]
  
  				__magic_name__     ,					__magic_name__	:	str			     =  get_raw_scores(_a		,     _a	)
  				__magic_name__	:	Optional[int]			     =  apply_no_ans_threshold(_a		,     _a		,     _a		,     _a	)
  				__magic_name__	:	Optional[Any]			     =  apply_no_ans_threshold(_a		,     _a		,     _a		,     _a	)
  				__magic_name__	:	List[Any]			     =  make_eval_dict(_a		,     _a	)
  
  				if has_ans_qids:
  					__magic_name__	:	str			     =  make_eval_dict(_a		,     _a		,     qid_list=_a	)
  					merge_eval(_a		,     _a		,     "HasAns"	)
  				if no_ans_qids:
  					__magic_name__	:	int			     =  make_eval_dict(_a		,     _a		,     qid_list=_a	)
  					merge_eval(_a		,     _a		,     "NoAns"	)
  				find_all_best_thresh(_a		,     _a		,     _a		,     _a		,     _a		,     _a	)
  				return dict(_a	)
  
style_context: 
  from __future__ import annotations
  
  snake_case				:	List[str]							   =						"Alexander Joslin"
  
  
  
  
  
  
  def 						lowerCAmelCase_		(      _snake_case   :						int     )       ->	int:
  
  
  
  
  
  
  
  	'''simple docstring'''
  
  
  	if number <= 0:
  		__magic_name__	:	int			     =  F'''n must be greater than 0. Got n = {number}'''
  		raise ValueError(_snake_case     )
  
  	__magic_name__	:	List[str]			     =  [number + 1] * (number + 1)
  
  	# starting position
  	__magic_name__	:	Any			     =  0
  	for i in range(1   ,     _snake_case     ):
  		__magic_name__	:	Optional[int]			     =  min(table[i + 1]   ,     table[i] + 1     )
  		# check if out of bounds
  		if i * 2 <= number:
  			__magic_name__	:	str			     =  min(table[i * 2]   ,     table[i] + 1     )
  		# check if out of bounds
  		if i * 3 <= number:
  			__magic_name__	:	Any			     =  min(table[i * 3]   ,     table[i] + 1     )
  	return table[number]
  
  
  if __name__ == "__main__":
  				import doctest
  
  				doctest.testmod()
  