X-NavDP: グループQスコア再重み付けマッチングによる新規行動と異種エンボディメントへのナビゲーション拡散ポリシーの一般化
X-NavDP: Generalizing Navigation Diffusion Policy to Novel Behavior and Embodiments with Group Q-score Reweighted Matching
ナビゲーション拡散ポリシーを強化学習で事後訓練し、多様なロボット形態や困難なシナリオへの一般化を向上させるフレームワークGQRMを提案。シミュレーションと実世界で成功率を大幅に改善した。
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著者: Tianyu Yang, Yiming Zeng, Wenzhe Cai, Yuqiang Yang, Jiaqi Peng, Hui Cheng, Jiangmiao Pang, Tai Wang
分類: cs.RO
原文アブストラクト
Pretraining navigation diffusion policies rely on large-scale expert demonstrations. These data are typically generated by a fully-informed oracle planner suited to a single nominal robot. This limits the policy's generalization to diverse embodiments and challenging scenarios (e.g., escaping dead ends or detouring long obstacles) that demand diverse local reactive behaviors with only onboard local observations. Post-training the policy with reinforcement learning (RL) offers a principled remedy. However, previous RL for diffusion approaches lead to only marginal improvements. This is because the intractable likelihood of diffusion policies renders policy gradients unstable in addition to inefficient policy exploration. To address these challenges, we propose a data-efficient diffusion RL post-training framework - GQRM (Group Q-score Reweighted Matching). Our framework introduces two complementary designs: (i) a self-bootstrapped exploration strategy with behavior perturbation that preserves the pretrained policy prior, and (ii) a group Q-score normalization mechanism that computes per-trajectory values on each state for efficient reweighted score matching. By conducting distributed online RL training across heterogeneous embodiments, the resulting fine-tuned policy, X-NavDP, achieves state-of-the-art cross-embodiment visual navigation performance, improving the overall success rate from 61.20% to 84.28% in simulation and 10% to 65% in real-world hard cases. The code and model are publicly available at https://yty-sky.github.io/x-navdp-project-page.
