File size: 959 Bytes
4943752 |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 |
"""
METEOR Constraints
--------------------------
"""
import nltk
from textattack.constraints import Constraint
class METEOR(Constraint):
"""A constraint on METEOR score difference.
Args:
max_meteor (int): Max METEOR score allowed.
compare_against_original (bool): If `True`, compare new `x_adv` against the original `x`.
Otherwise, compare it against the previous `x_adv`.
"""
def __init__(self, max_meteor, compare_against_original=True):
super().__init__(compare_against_original)
if not isinstance(max_meteor, int):
raise TypeError("max_meteor must be an int")
self.max_meteor = max_meteor
def _check_constraint(self, transformed_text, reference_text):
meteor = nltk.translate.meteor([reference_text], transformed_text)
return meteor <= self.max_meteor
def extra_repr_keys(self):
return ["max_meteor"] + super().extra_repr_keys()
|