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"""
MORPHEUS2020
===============
(It’s Morphin’ Time! Combating Linguistic Discrimination with Inflectional Perturbations)
"""
from textattack import Attack
from textattack.constraints.pre_transformation import (
RepeatModification,
StopwordModification,
)
from textattack.goal_functions import MinimizeBleu
from textattack.search_methods import GreedySearch
from textattack.transformations import WordSwapInflections
from .attack_recipe import AttackRecipe
class MorpheusTan2020(AttackRecipe):
"""Samson Tan, Shafiq Joty, Min-Yen Kan, Richard Socher.
It’s Morphin’ Time! Combating Linguistic Discrimination with Inflectional Perturbations
https://www.aclweb.org/anthology/2020.acl-main.263/
"""
@staticmethod
def build(model_wrapper):
#
# Goal is to minimize BLEU score between the model output given for the
# perturbed input sequence and the reference translation
#
goal_function = MinimizeBleu(model_wrapper)
# Swap words with their inflections
transformation = WordSwapInflections()
#
# Don't modify the same word twice or stopwords
#
constraints = [RepeatModification(), StopwordModification()]
#
# Greedily swap words (see pseudocode, Algorithm 1 of the paper).
#
search_method = GreedySearch()
return Attack(goal_function, constraints, transformation, search_method)
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