evaluate-v1.1.py

""" Official evaluation script for v1.1 of the SQuAD dataset. """
from __future__ import print_function
from collections import Counter
import string
import re
import argparse
import json
import sys
import tokenization


def normalize_answer(s):
    """Lower text and remove punctuation, articles and extra whitespace."""
    def remove_articles(text):
        return re.sub(r'\b(a|an|the)\b', ' ', 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 f1_score(prediction, ground_truth):
    prediction_tokens = normalize_answer(prediction['text']).split()
    ground_truth_tokens = normalize_answer(ground_truth).split()
    common = Counter(prediction_tokens) & Counter(ground_truth_tokens)
    num_same = sum(common.values())
    if num_same == 0:
        return 0
    precision = 1.0 * num_same / len(prediction_tokens)
    recall = 1.0 * num_same / len(ground_truth_tokens)
    f1 = (2 * precision * recall) / (precision + recall)
    return f1


def exact_match_score(prediction, ground_truth):
    return (normalize_answer(prediction['text']) == normalize_answer(ground_truth))

def exact_match_passage_score(prediction, paragraph, qa):
    tokenizer = tokenization.FullTokenizer(vocab_file='/dccstor/slad/wanghaoy/pre_trained_models/bert_base_uncased/vocab.txt', do_lower_case=True)
    example = tokenizer.tokenize(qa['question']) + ['SEP']
    doc_tokens = []
    char_to_word_offset = []
    prev_is_whitespace = True
    def is_whitespace(c):
        if c == " " or c == "\t" or c == "\r" or c == "\n" or ord(c) == 0x202F:
            return True
        return False
    for c in paragraph['context']:
        if is_whitespace(c):
            prev_is_whitespace = True
        else:
            if prev_is_whitespace:
                doc_tokens.append(c)
            else:
                doc_tokens[-1] += c
            prev_is_whitespace = False
        char_to_word_offset.append(len(doc_tokens) - 1)
    for token in doc_tokens:
        example += tokenizer.tokenize(token)
    if '[unused0]' in example:
        boundary_index = example.index('[unused0]')
    else:
        boundary_index = -1
    return prediction['start_index'] > boundary_index

def metric_max_over_ground_truths(metric_fn, prediction, ground_truths):
    scores_for_ground_truths = []
    for ground_truth in ground_truths:
        score = metric_fn(prediction, ground_truth)
        scores_for_ground_truths.append(score)
    return max(scores_for_ground_truths)


def evaluate(dataset, predictions):
    f1 = exact_match = exact_match_passage = total = skip = 0
    for article in dataset:
        for paragraph in article['paragraphs']:
            for qa in paragraph['qas']:
                if qa['answers'][0]['answer_start'] == -1:
                    skip += 1
                    continue
                total += 1
                if qa['id'] not in predictions:
                    message = 'Unanswered question ' + qa['id'] + \
                              ' will receive score 0.'
                    print(message, file=sys.stderr)
                    continue
                ground_truths = list(map(lambda x: x['text'], qa['answers']))
                prediction = predictions[qa['id']]
                exact_match += metric_max_over_ground_truths(
                    exact_match_score, prediction, ground_truths)
                f1 += metric_max_over_ground_truths(
                    f1_score, prediction, ground_truths)
                # exact_match_passage += exact_match_passage_score(prediction, paragraph, qa)

    exact_match = 100.0 * exact_match / total
    f1 = 100.0 * f1 / total
    exact_match_passage = 100.0 * exact_match_passage / total
    return {'exact_match': exact_match, 'f1': f1, 'skiped': skip, 'remain': total}


if __name__ == '__main__':
    expected_version = '1.1'
    parser = argparse.ArgumentParser(
        description='Evaluation for SQuAD ' + expected_version)
    parser.add_argument('dataset_file', help='Dataset file')
    parser.add_argument('prediction_file', help='Prediction File')
    args = parser.parse_args()
    with open(args.dataset_file) as dataset_file:
        dataset_json = json.load(dataset_file)
        # if (dataset_json['version'] != expected_version):
        #     print('Evaluation expects v-' + expected_version +
        #           ', but got dataset with v-' + dataset_json['version'],
        #           file=sys.stderr)
        dataset = dataset_json['data']
    with open(args.prediction_file) as prediction_file:
        predictions = json.load(prediction_file)
    print(json.dumps(evaluate(dataset, predictions)))