eval_squad.py

"""Official evaluation script for SQuAD version 2.0.

In addition to basic functionality, we also compute additional statistics and
plot precision-recall curves if an additional na_prob.json file is provided.
This file is expected to map question ID's to the model's predicted probability
that a question is unanswerable.
"""
import argparse
import collections
import json
import numpy as np
import os
import re
import string
import sys



def normalize_answer(s):
    def remove_articles(text):
        regex = re.compile(r'\b(a|an|the)\b', re.UNICODE)
        return re.sub(regex, ' ', text)
    def white_space_fix(text):
        return ' '.join(text.split())
    def remove_punc(text):
        exclude = set(string.punctuation)
        return ''.join(ch for ch in text if ch not in exclude)
    def lower(text):
        return text.lower()
    return white_space_fix(remove_articles(remove_punc(lower(s))))
def get_tokens(s):
    if not s: return []
    return normalize_answer(s).split()

def compute_exact(a_gold, a_pred):
    return int(normalize_answer(a_gold) == normalize_answer(a_pred))

def compute_f1(a_gold, a_pred):
    gold_toks = get_tokens(a_gold)
    pred_toks = get_tokens(a_pred)
    common = collections.Counter(gold_toks) & collections.Counter(pred_toks)
    num_same = sum(common.values())
    if len(gold_toks) == 0 or len(pred_toks) == 0:
        # If either is no-answer, then F1 is 1 if they agree, 0 otherwise
        return int(gold_toks == pred_toks)
    if num_same == 0:
        return 0
    precision = 1.0 * num_same / len(pred_toks)
    recall = 1.0 * num_same / len(gold_toks)
    f1 = (2 * precision * recall) / (precision + recall)
    return f1



    
    
def get_score_from_data(output_data):
    preds,labels = map(list,zip(*[[item['predicted'], item['ground_truth']] for item in output_data]))
    exact_scores = 0
    f1_scores = 0
    for pred,label in zip(preds,labels):
        exact_scores += compute_exact(normalize_answer(label), pred)  # 此处只有一个answer
        f1_scores += compute_f1(normalize_answer(label), pred) # macro
    return exact_scores / len(preds), f1_scores / len(preds)
    

if __name__ == '__main__':
    pass