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arXiv 2507.17477cs.AI

一种面向大语言模型的不确定性驱动自适应自对齐框架

An Uncertainty-Driven Adaptive Self-Alignment Framework for Large Language Models

Haoran Sun, Zekun Zhang, Shaoning Zeng

AI总结:

本文提出 UDASA 全自动自对齐框架,通过语义、事实性和价值三维不确定性构建偏好对并分阶段渐进优化模型,在多项任务上优于现有对齐方法。

摘要:

大语言模型(LLMs)在指令遵循和通用推理方面已展现出显著进展。然而,在没有人工标注的情况下,实现与人类意图及安全规范的高质量对齐,仍然是一项根本性挑战。本文提出一种不确定性驱动自适应自对齐(Uncertainty-Driven Adaptive Self-Alignment,UDASA)框架,旨在以完全自动化的方式提升 LLM 对齐水平。UDASA 首先为每个输入生成多个回复,并从语义、事实性和价值对齐三个维度量化输出不确定性。基于这些不确定性分数,该框架构建偏好对,并根据训练样本的不确定性差异将其划分为三个阶段:保守阶段、适度阶段和探索阶段。随后,模型在这些阶段中被逐步优化。此外,我们开展了一系列初步研究,以验证核心设计假设,并为所提出的框架提供有力的经验依据。实验结果表明,UDASA 在无害性、有用性、真实性和受控情感生成等多项任务上优于现有对齐方法,显著提升了模型性能。

英文摘要:

Large Language Models (LLMs) have demonstrated remarkable progress in instruction following and general-purpose reasoning. However, achieving high-quality alignment with human intent and safety norms without human annotations remains a fundamental challenge. In this work, we propose an Uncertainty-Driven Adaptive Self-Alignment (UDASA) framework designed to improve LLM alignment in a fully automated manner. UDASA first generates multiple responses for each input and quantifies output uncertainty across three dimensions: semantics, factuality, and value alignment. Based on these uncertainty scores, the framework constructs preference pairs and categorizes training samples into three stages, conservative, moderate, and exploratory, according to their uncertainty difference. The model is then optimized progressively across these stages. In addition, we conduct a series of preliminary studies to validate the core design assumptions and provide strong empirical motivation for the proposed framework. Experimental results show that UDASA outperforms existing alignment methods across multiple tasks, including harmlessness, helpfulness, truthfulness, and controlled sentiment generation, significantly improving model performance.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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