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arXiv · 2509.15154

MedFact-R1: Towards Factual Medical Reasoning via Pseudo-Label Augmentation

Gengliang Li·Rongyu Chen·Bin Li·Linlin Yang·Guodong Ding
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Abstract

Ensuring factual consistency and reliable reasoning remains a critical challenge for medical vision-language models. We introduce MEDFACT-R1, a two-stage framework that integrates external knowledge grounding with reinforcement learning to improve the factual medical reasoning. The first stage uses pseudo-label supervised fine-tuning (SFT) to incorporate external factual expertise; while the second stage applies Group Relative Policy Optimization (GRPO) with four tailored factual reward signals to encourage self-consistent reasoning. Across three public medical QA benchmarks, MEDFACT-R1 delivers up to 22.5% absolute improvement in factual accuracy over previous state-of-the-art methods. Ablation studies highlight the necessity of pseudo-label SFT cold start and validate the contribution of each GRPO reward, underscoring the synergy between knowledge grounding and RL-driven reasoning for trustworthy medical AI. Codes are released at https://github.com/Garfieldgengliang/MEDFACT-R1.

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Gengliang Li, Rongyu Chen, Bin Li, Linlin Yang, Guodong Ding. 2025-09-18. MedFact-R1: Towards Factual Medical Reasoning via Pseudo-Label Augmentation. https://arxiv.org/abs/2509.15154

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