arXiv AI
Sep 25

Beyond Average Safety: Chance-Constrained LLM Fine-tuning

The paper introduces a chance-constrained approach to fine‑tune large language models (LLMs) that limits the proportion of safety examples whose performance degrades beyond a set threshold relative to a reference model. By replacing the discontinuous violation indicator with a differentiable majorization, the authors derive a tractable, conservative constraint and a closed‑form, constraint‑aware gradient update that focuses on examples near or above the degradation threshold. Experiments on harmful fine‑tuning across three tasks and models show that this tail‑aware method consistently outperforms existing safety‑preserving baselines, suggesting that safety preservation should be treated as a reliability‑constrained optimization problem rather than average‑risk regularization.

By Taha Entesari, Mahyar Fazlyab
arXiv AI
Jul 3

Conformal Policy Control

arXiv:2603. 02196v3 Announce Type: replace Abstract: An agent must try new behaviors to explore and improve.

By Drew Prinster, Clara Fannjiang, Ji Won Park, Kyunghyun Cho, Anqi Liu, Suchi Saria, Samuel Stanton