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arXiv 2507.13158cs.LGcs.AIcs.CL

逆强化学习遇见大语言模型后训练:基础、进展与机遇

Inverse Reinforcement Learning Meets Large Language Model Post-Training: Basics, Advances, and Opportunities

Department of Applied Mathematics and Theoretical Physics(应用数学与理论物理系);University of Cambridge(剑桥大学)

Hao Sun, Mihaela van der Schaar

AI总结:

本文从逆强化学习视角系统综述了大语言模型对齐的最新进展,分析其与传统强化学习的差异、神经奖励模型构建的必要性、数据集与评估等实践问题,并指出稀疏奖励RL带来的开放问题与未来方向。

摘要:

在大语言模型(LLMs)时代,对齐已成为追求更可靠、更可控、能力更强的机器智能过程中一个根本性且具有挑战性的问题。推理模型和对话式人工智能系统近期的成功凸显了强化学习(RL)在增强这些系统中的关键作用,推动了对RL与LLM对齐交叉领域研究兴趣的增长。本文从逆强化学习(IRL)的视角对LLM对齐的最新进展进行了全面综述,强调了LLM对齐中使用的RL技术与传统RL任务中使用的RL技术之间的区别。特别是,我们强调了从人类数据构建神经奖励模型的必要性,并讨论了这一范式转变在形式层面和实践层面的意义。我们首先介绍RL中的基本概念,为不熟悉该领域的读者提供基础。然后,我们审视这一研究议程中的最新进展,讨论在LLM对齐中开展IRL所面临的关键挑战与机遇。除方法学考量外,我们还探讨了实践层面,包括数据集、基准、评估指标、基础设施以及计算高效的训练和推理技术。最后,我们从稀疏奖励RL的文献中汲取见解,以识别开放问题和潜在研究方向。通过综合不同研究的发现,我们旨在提供对该领域结构化且具有批判性的概述,突出尚未解决的挑战,并勾勒出通过RL和IRL技术改进LLM对齐的有前景的未来方向。

英文摘要:

In the era of Large Language Models (LLMs), alignment has emerged as a fundamental yet challenging problem in the pursuit of more reliable, controllable, and capable machine intelligence. The recent success of reasoning models and conversational AI systems has underscored the critical role of reinforcement learning (RL) in enhancing these systems, driving increased research interest at the intersection of RL and LLM alignment. This paper provides a comprehensive review of recent advances in LLM alignment through the lens of inverse reinforcement learning (IRL), emphasizing the distinctions between RL techniques employed in LLM alignment and those in conventional RL tasks. In particular, we highlight the necessity of constructing neural reward models from human data and discuss the formal and practical implications of this paradigm shift. We begin by introducing fundamental concepts in RL to provide a foundation for readers unfamiliar with the field. We then examine recent advances in this research agenda, discussing key challenges and opportunities in conducting IRL for LLM alignment. Beyond methodological considerations, we explore practical aspects, including datasets, benchmarks, evaluation metrics, infrastructure, and computationally efficient training and inference techniques. Finally, we draw insights from the literature on sparse-reward RL to identify open questions and potential research directions. By synthesizing findings from diverse studies, we aim to provide a structured and critical overview of the field, highlight unresolved challenges, and outline promising future directions for improving LLM alignment through RL and IRL techniques.

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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