Understanding the Effect of Model Compression on Social Bias in Large Language Models

Gustavo Gonçalves, Emma Strubell


Abstract
Large Language Models (LLMs) trained with self-supervision on vast corpora of web text fit to the social biases of that text. Without intervention, these social biases persist in the model’s predictions in downstream tasks, leading to representational harm. Many strategies have been proposed to mitigate the effects of inappropriate social biases learned during pretraining. Simultaneously, methods for model compression have become increasingly popular to reduce the computational burden of LLMs. Despite the popularity and need for both approaches, little work has been done to explore the interplay between these two. We perform a carefully controlled study of the impact of model compression via quantization and knowledge distillation on measures of social bias in LLMs. Longer pretraining and larger models led to higher social bias, and quantization showed a regularizer effect with its best trade-off around 20% of the original pretraining time.
Anthology ID:
2023.emnlp-main.161
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:
2663–2675
Language:
URL:
https://aclanthology.org/2023.emnlp-main.161
DOI:
10.18653/v1/2023.emnlp-main.161
Bibkey:
Cite (ACL):
Gustavo Gonçalves and Emma Strubell. 2023. Understanding the Effect of Model Compression on Social Bias in Large Language Models. In Proceedings of the 2023 Conference on Empirical Methods in Natural Language Processing, pages 2663–2675, Singapore. Association for Computational Linguistics.
Cite (Informal):
Understanding the Effect of Model Compression on Social Bias in Large Language Models (Gonçalves & Strubell, EMNLP 2023)
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PDF:
https://aclanthology.org/2023.emnlp-main.161.pdf
Video:
 https://aclanthology.org/2023.emnlp-main.161.mp4