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import re
import string
from collections import Counter
def normalize_answer(s):
"""
Taken from the official evaluation script for v1.1 of the SQuAD dataset.
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_abstractive(predictions, references):
"""
Taken from the official evaluation script for v1.1 of the SQuAD dataset.
"""
prediction_tokens = normalize_answer(predictions[0]).split()
references_tokens = normalize_answer(references[0]).split()
common = Counter(prediction_tokens) & Counter(references_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(references_tokens)
f1 = (2 * precision * recall) / (precision + recall)
return f1
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