SCENE: Self-Labeled Counterfactuals for Extrapolating to Negative Examples

Deqing Fu, Ameya Godbole, Robin Jia


Abstract
Detecting negatives (such as non-entailment relationships, unanswerable questions, and false claims) is an important and challenging aspect of many natural language understanding tasks. Though manually collecting challenging negative examples can help models detect them, it is both costly and domain-specific. In this work, we propose Self-labeled Counterfactuals for Extrapolating to Negative Examples (SCENE), an automatic method for synthesizing training data that greatly improves models’ ability to detect challenging negative examples. In contrast with standard data augmentation, which synthesizes new examples for existing labels, SCENE can synthesize negative examples zero-shot from only positive ones. Given a positive example, SCENE perturbs it with a mask infilling model, then determines whether the resulting example is negative based on a self-training heuristic. With access to only answerable training examples, SCENE can close 69.6% of the performance gap on SQuAD 2.0, a dataset where half of the evaluation examples are unanswerable, compared to a model trained on SQuAD 2.0. Our method also extends to boolean question answering and recognizing textual entailment, and improves generalization from SQuAD to ACE-whQA, an out-of-domain extractive QA benchmark.
Anthology ID:
2023.emnlp-main.485
Volume:
Proceedings of the 2023 Conference on Empirical Methods in Natural Language Processing
Month:
December
Year:
2023
Address:
Singapore
Editors:
Houda Bouamor, Juan Pino, Kalika Bali
Venue:
EMNLP
SIG:
Publisher:
Association for Computational Linguistics
Note:
Pages:
7832–7848
Language:
URL:
https://aclanthology.org/2023.emnlp-main.485
DOI:
10.18653/v1/2023.emnlp-main.485
Bibkey:
Cite (ACL):
Deqing Fu, Ameya Godbole, and Robin Jia. 2023. SCENE: Self-Labeled Counterfactuals for Extrapolating to Negative Examples. In Proceedings of the 2023 Conference on Empirical Methods in Natural Language Processing, pages 7832–7848, Singapore. Association for Computational Linguistics.
Cite (Informal):
SCENE: Self-Labeled Counterfactuals for Extrapolating to Negative Examples (Fu et al., EMNLP 2023)
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PDF:
https://aclanthology.org/2023.emnlp-main.485.pdf
Video:
 https://aclanthology.org/2023.emnlp-main.485.mp4