生成的相互作用:二層潜在ダイナミクスによる多人数人体動作の織り成し
Generative Interactions: Weaving Multiparty Human Motion with Bilevel Latent Dynamics
集団レベルの潜在状態と個人レベルの潜在状態を階層的に組み合わせ、多人数の社会的動作生成をメタ転移学習として定式化したモデルBRAIDを提案。
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著者: Ojas Shirekar, Yash Surange, Agustinas Jučas, Chirag Raman
分類: cs.AI, cs.LG
原文アブストラクト
Human social behaviour is not a collection of independent motions, but a jointly organised process in which group dynamics and individual variation continuously shape one another. Yet existing social motion models often prioritise plausible trajectories while leaving interaction state implicit, limiting their ability to transfer across groups, tasks, and partial-observation regimes. To address this gap, we introduce Bilevel Representations for Agent Interaction Dynamics (BRAID), a hierarchical sequential latent-variable model for generative multi-person interaction. BRAID explicitly formulates social motion generation as a meta-transfer learning problem: shared interaction priors are learned across datasets and adapted through arbitrary context sets of observed people and joints. The model represents each scene through a group-level latent state that captures shared interaction dynamics and person-level latent states that capture individual behaviour conditioned on the evolving group context. This modelling choice enables coherent generation under full, sparse, or partial observations while exposing compact social-state vectors that can serve as an interface for downstream embodied-agent systems. We evaluate BRAID under a unified SMPL-based representation on social forecasting, tracking and in-filling, and response generation, using metrics that assess not only reconstruction accuracy but also realism, diversity, temporal alignment, and interpersonal coordination. We further analyse the hierarchical latent space, showing that it captures separable group- and individual-level structure.