OGPO: 復帰可能なVision-Language-Actionモデルのためのオフライン目標条件付き方策最適化
OGPO: Offline Goal-conditioned Policy Optimization for Recoverable Vision-Language-Action Models
VLAモデルの事後学習を、軌道レベルの模倣から意味的キー状態への到達可能性学習へと転換するオフライン目標条件付き方策最適化フレームワークを提案し、オンライン対話なしで外乱からの復帰能力と堅牢性を向上させた。
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: Xule Gao, Xi Wang, Zehua Zang, Rui Wang, Changwen Zheng, Chuxiong Sun
分類: cs.AI
原文アブストラクト
Vision-language-action (VLA) models have shown strong promise in robotic manipulation, yet their post-training still predominantly relies on trajectory-level supervised imitation over robot demonstrations. While effective for learning feasible actions, this paradigm supervises policies to reproduce expert actions at each step, biasing them toward demonstration-specific action paths and providing limited guidance for recovering toward task-progress states once execution deviates from demonstrated trajectories. To address this limitation, we propose OGPO, an Offline Goal-conditioned Policy Optimization framework for recoverable VLA post-training. Instead of treating offline demonstrations merely as step-wise action labels, OGPO adaptively relabels trajectories with semantic key states and constructs goal-conditioned process rewards to optimize the policy for reaching these task-progress states. In this way, OGPO shifts VLA post-training from trajectory-level action imitation to key-state reachability learning, enabling policies to acquire a more robust ability to complete goal states from feasible off-demonstration states without requiring additional online interaction. Experiments on LIBERO and MetaWorld show that OGPO consistently improves VLA policy performance over standard supervised fine-tuning. Moreover, evaluations on LIBERO-Plus and our proposed LIBERO-ReAct, a mid-execution perturbation benchmark, further demonstrate that OGPO achieves stronger robustness and goal-directed recoverability under distribution shifts and recoverable off-demonstration states.