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Control Barrier Function for Aligning Large Language Models

2025-11-05 02:12:59
Yuya Miyaoka, Masaki Inoue
arXiv_AI
         
Abstract

This paper proposes a control-based framework for aligning large language models (LLMs) by leveraging a control barrier function (CBF) to ensure user-desirable text generation. The presented framework applies the CBF safety filter to the predicted token generated from the baseline LLM, to intervene in the generated text. The safety filter includes two significant advantages: this safety filter is an add-on type, allowing it to be used for alignment purposes without fine-tuning the baseline LLM, and if there is an evaluation model regarding the desired alignment, it can be directly applied to the filter design. The overall text-generation system is implemented with open-source language models, aiming to generate positive text.

Abstract (translated)

URL

https://arxiv.org/abs/2511.03121

PDF

https://arxiv.org/pdf/2511.03121.pdf

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