This is a version of squad derived from SQuAD v2 on which we did the following changes:

def remove_long_answers(example): #MAP
    new_answers = {'text':[], 'answer_start':[]}
    answers_set = set()
    for text, start in zip(example['answers']['text'], example['answers']['answer_start']):
        if len(text.split()) > 10:
            continue
        else:
            if (text, start) not in answers_set:
                new_answers['text'].append(text)
                new_answers['answer_start'].append(start)
                answers_set.add((text, start))
    example['answers'] = new_answers
    return example
   
     
def filter_whitespace(example): #MAP
    example['context'] = ' '.join(example['context'].split())
    example['question'] = ' '.join(example['question'].split())
    example['answers']['text'] = [' '.join(answer.split()) for answer in example['answers']['text']]
    return example
  
      
def checks(example): #FILTER
    if example['answers']['text'] == []:
        return False

    if len(example['question'].split()) > 35:
        return False
    
    if len(example['question'].split()) < 3:
        return False

    return True