PAG: Multi-Turn Reinforced LLM Self-Correction with Policy as Generative Verifier

• URL: http://arxiv.org/abs/2506.10406v1
• Date: Thu, 12 Jun 2025 06:59:35 GMT
• Title: PAG: Multi-Turn Reinforced LLM Self-Correction with Policy as Generative Verifier
• Authors: Yuhua Jiang, Yuwen Xiong, Yufeng Yuan, Chao Xin, Wenyuan Xu, Yu Yue, Qianchuan Zhao, Lin Yan,
• Abstract summary: Policy as Generative Verifier (PAG) is a framework that empowers Large Language Models to self-correct by alternating between policy and verifier roles.<n>It alleviates model collapse and jointly enhances both reasoning and verification abilities.
• Score: 18.771754895027616
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Large Language Models (LLMs) have demonstrated impressive capabilities in complex reasoning tasks, yet they still struggle to reliably verify the correctness of their own outputs. Existing solutions to this verification challenge often depend on separate verifier models or require multi-stage self-correction training pipelines, which limit scalability. In this paper, we propose Policy as Generative Verifier (PAG), a simple and effective framework that empowers LLMs to self-correct by alternating between policy and verifier roles within a unified multi-turn reinforcement learning (RL) paradigm. Distinct from prior approaches that always generate a second attempt regardless of model confidence, PAG introduces a selective revision mechanism: the model revises its answer only when its own generative verification step detects an error. This verify-then-revise workflow not only alleviates model collapse but also jointly enhances both reasoning and verification abilities. Extensive experiments across diverse reasoning benchmarks highlight PAG's dual advancements: as a policy, it enhances direct generation and self-correction accuracy; as a verifier, its self-verification outperforms self-consistency.

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