意味・動態・制御を再配線する:シンプルかつ効果的な行動中心型トリプルストリームTransformer
Rewiring Semantics, Dynamics, and Control: A Simple yet Effective Action-Centric Tri-Stream Transformer
VLMと動画生成ワールドモデルを別々のストリームとして保持しつつ、行動専門家が層ごとのアテンションで両者の表現を統合するACT³を提案し、実機・シミュレーションのマニピュレーションで優れた性能を示した。
詳しい要約
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著者: Shuang Luo, Yilun Kong, Yunpeng Qing, Yihang Jiao, Zhi Hou, Shunyu Liu, Xiaogang Wang, Dacheng Tao
分類: cs.RO, cs.AI
原文アブストラクト
Vision-Language-Action (VLA) models have emerged as a prominent framework for complex robotic manipulation, building on the strong semantic understanding of pretrained Vision-Language Models (VLMs). However, such VLM backbones offer insufficient physical dynamics priors, which limits the generalization capabilities of robot policies. Recent efforts therefore integrate video-generation World Models (WMs) into robot policies through various strategies, using predictive dynamics to facilitate action generation. Despite these advances, harnessing semantic understanding and dynamics prediction as complementary guidance for action generation remains challenging. In this paper, we introduce $\mathrm{ACT}^3$, a simple yet effective Action-Centric Tri-Stream Transformer that fuses semantic and dynamics information into control actions while preserving the distinct roles of context streams. Specifically, $\mathrm{ACT}^3$ enables the dedicated action expert to access VLM and WM representations through layerwise attention, with each backbone attending only within its own stream. This straightforward interaction design maintains independent forward propagation in the context streams while allowing both backbones to be updated through control supervision. Experiments on both simulated and real-world robotic manipulation benchmarks show that the proposed $\mathrm{ACT}^3$ yields results superior to its counterparts.