多様体認識型経験再生による外骨格制御の継続的オンライン個人化
Continual Online Personalization of Exoskeleton Control via Manifold-Aware Experience Replay
外骨格制御のオンライン適応中に生じる破滅的忘却を防ぐため、多様体認識型の経験再生フレームワークを開発し、歩行タスクの切り替え時でも個人化支援を維持できることを示した。
詳しい要約
1. どんなもの?
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著者: Changseob Song, Inseung Kang
分類: cs.RO
原文アブストラクト
Personalizing exoskeleton control remains a critical challenge for clinical users with gait disabilities. Online adaptation (OA) offers an effective solution by adapting in real time to subject variability, device fit, and diverse locomotor tasks. However, OA involves a continual stream of user state data, which can lead to catastrophic forgetting of previously learned locomotor contexts. Here, we develop a manifold-aware experience replay-based online personalization framework designed to maintain user-specific representations across diverse tasks during OA of exoskeleton control. By replaying previously experienced tasks from a replay buffer, we preserve the personalized exoskeleton assistance across all learned tasks. Furthermore, we capture a gait manifold that distinguishes between different locomotor tasks, removing the need for explicit task labeling when selecting target replay bins. We evaluated our framework on emulated hemiplegic gait, which largely deviates from able-bodied patterns, across multiple forgetting scenarios with speed and incline transitions. Our manifold-aware replay framework achieved 40% and 60% improvements in torque and gait phase tracking accuracy, respectively, compared to a baseline framework without replay, which exhibited catastrophic forgetting during task transitions. This demonstrates that our proposed framework personalizes exoskeleton control in real time across diverse locomotor contexts in daily ambulation of clinical populations.
