DistAL: 距離ベースアドバンテージ学習によるVLAファインチューニング
DistAL: Distance-based Advantage Learning for VLA Fine-Tuning
VLAのアドバンテージ条件付けにおいて、埋め込み空間の距離を報酬として用いることで、より情報量の多い価値関数を学習しタスク成功率を向上させる手法を提案。シミュレーションと実機の両手巧緻マニピュレーションで検証した。
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1. どんなもの?
2. 先行研究と比べてどこがすごい?
3. 技術・手法の肝は?
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著者: Reece O'Mahoney, Ioannis Havoutis
分類: cs.RO
原文アブストラクト
Vision-language-action models (VLAs) have trans- formed the field of robotic manipulation in recent years by combining the semantic understanding of LLMs with the precise control of flow-matching policies. Advantage conditioning is a recent technique that iteratively improves VLAs by training a value function on deployment data and using this to train an advantage-conditioned policy. Previous works have only applied simple, low-information success/failure rewards, which leave the value function unable to distinguish states of differing quality beyond how far along the task they appear. Motivated by an exploration of out-of-distribution (OOD) detection methods, we introduce Distance-based Advantage Learning (DistAL), which, by using an embedding space distance as a reward, produces a more informative value function and subsequently a higher downstream task success rate. We validate our method on a series of simulation benchmarks and dexterous bi-manual manipulation tasks on real hardware.