世界運動モデル:SE(3)軌道の柔軟な系列モデリング
World Motion Models: Flexible Sequence Modeling of SE(3) Trajectories
動的3D世界の要素を剛体SE(3)軌道として表現し、フローマッチングによる系列モデリングで予測・補間・制御・IK・リターゲティング・方策学習を統一的に扱う手法を提案。
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: Jiahui Lei, Qianqian Wang, Trevor Darrell, Angjoo Kanazawa
分類: cs.RO, cs.CV
原文アブストラクト
Equipping artificial agents with spatial intelligence requires a comprehensive generative prior over the dynamic 3D world. We propose World Motion Models (WMMs) that capture "what was, is, and will be where across time" via sparse SE(3) pose trajectories. WMMs are built on the observation that elements of dynamic scenes can be well approximated by a set of rigid SE(3) trajectories, a minimal yet expressive primitive for 4D modeling. This representation unifies articulated objects, human bodies, hand-object interactions, piecewise-rigid scene dynamics, camera motion, and even robot states and actions into a single shared space. Given this representation, we cast the joint distribution of these entities as a flexible sequence modeling problem, utilizing flow-matching with per-token noise levels. Coupled with a context token mechanism for non-sequential conditioning, this formulation supports any-to-any marginal conditioning across an arbitrary number of entities and time steps. Tasks such as future prediction, motion infilling, model-predictive control, inverse kinematics, cross-embodiment retargeting, and policy learning all reduce to the application of different masks over the same network. Experiments on 6 diverse applications of 3D vision and robotics demonstrate the versatility and flexibility of WMMs with strong performance.