幻覚を考慮した世界モデルベース方策最適化による汎用ロボット方策
HaWMPO: Hallucination-Aware World Model-based Policy Optimization for Generalist Robot Policy
世界モデルが生成する長期ロールアウトの幻覚を検出して信頼度を推定し、そのスコアを強化学習に組み込むことで、VLA方策の事後学習を安定化・高性能化する手法を提案。
詳しい要約
1. どんなもの?
2. 先行研究と比べてどこがすごい?
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著者: Zengjue Chen, Peidong Liu, Jiawei Li, Qi Wang
分類: cs.RO
原文アブストラクト
Generalist robot policies have demonstrated strong generalization across robotic manipulation tasks, yet their success rates remain limited in com- plex long-horizon scenarios. Recent methods improve Visual-Language-Action (VLA) policies through online reinforcement learning on real robots, but such training relies on costly physical interactions, suffers from low sample efficiency, and may introduce hardware and safety risks. World models offer a promising alternative by enabling policy optimization with imagined rollouts. However, long-horizon rollouts generated by world models often suffer from prediction hal- lucinations, producing biased state transitions that can mislead policy learning. To address this issue, we propose Hallucination-aware World Model-based Pol- icy Optimization (HaWMPO), a closed-loop reinforcement learning pipeline for VLA policy post-training with world models. Specifically, HaWMPO introduces an action-conditioned hallucination-aware model to estimate the reliability of gen- erated image sequences, and incorporates hallucination scores into group relative policy optimization through a Reward-Soft mechanism, suppressing unreliable ac- tion chunks during training. On the LIBERO benchmark, HaWMPO achieves the best average success rate, with gains of 15.0% over the base model and 2.8% over the strongest baseline; real-world experiments on a G1 robot further validate its effectiveness, raising the average success rate on two manipulation tasks from 67.5% to 80.0%.