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Towards Anytime Fine-tuning: Continually Pre-trained Language Models with Hypernetwork Prompts

Gangwei Jiang, Caigao Jiang, Siqiao Xue, James Zhang, Jun Zhou, Defu Lian, Ying Wei


Abstract
Continual pre-training has been urgent for adapting a pre-trained model to a multitude of domains and tasks in the fast-evolving world. In practice, a continually pre-trained model is expected to demonstrate not only greater capacity when fine-tuned on pre-trained domains but also a non-decreasing performance on unseen ones. In this work, we first investigate such anytime fine-tuning effectiveness of existing continual pre-training approaches, concluding with unanimously decreased performance on unseen domains. To this end, we propose a prompt-guided continual pre-training method, where we train a hypernetwork to generate domain-specific prompts by both agreement and disagreement losses. The agreement loss maximally preserves the generalization of a pre-trained model to new domains, and the disagreement one guards the exclusiveness of the generated hidden states for each domain. Remarkably, prompts by the hypernetwork alleviate the domain identity when fine-tuning and promote knowledge transfer across domains. Our method achieved improvements of 3.57% and 3.4% on two real-world datasets (including domain shift and temporal shift), respectively, demonstrating its efficacy.
Anthology ID:
2023.findings-emnlp.808
Volume:
Findings of the Association for Computational Linguistics: EMNLP 2023
Month:
December
Year:
2023
Address:
Singapore
Editors:
Houda Bouamor, Juan Pino, Kalika Bali
Venue:
Findings
SIG:
Publisher:
Association for Computational Linguistics
Note:
Pages:
12081–12095
Language:
URL:
https://aclanthology.org/2023.findings-emnlp.808
DOI:
10.18653/v1/2023.findings-emnlp.808
Bibkey:
Cite (ACL):
Gangwei Jiang, Caigao Jiang, Siqiao Xue, James Zhang, Jun Zhou, Defu Lian, and Ying Wei. 2023. Towards Anytime Fine-tuning: Continually Pre-trained Language Models with Hypernetwork Prompts. In Findings of the Association for Computational Linguistics: EMNLP 2023, pages 12081–12095, Singapore. Association for Computational Linguistics.
Cite (Informal):
Towards Anytime Fine-tuning: Continually Pre-trained Language Models with Hypernetwork Prompts (Jiang et al., Findings 2023)
Copy Citation:
PDF:
https://aclanthology.org/2023.findings-emnlp.808.pdf