Vid2WAM: ビデオ拡散事前知識を世界行動モデルへ蒸留する
Vid2WAM: Distilling Video Diffusion Priors into World Action Models
大規模ビデオ基盤モデルの拡散事前知識を、コンパクトな世界行動モデル（WAM）に蒸留するフレームワークを提案。専門家デモに依存せず、タスク条件付き未来予測と逆動力学モデルによる擬似行動を活用し、限られたデモでも新規タスクへの汎化とデータ効率を向上させる。
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？
3. 技術・手法の肝は？
4. どうやって有効だと検証した？
5. 議論はある？
6. 次に読むべき論文は？
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著者: Chenhao Qiu, Ruixiang Wang, Runyi Zhao, Sixu Lin, Songen Gu, Shufeng Nan, Guiliang Liu, Kui Jia, Yanwei Fu, Simo Wu
分類: cs.RO
原文アブストラクト
World Action Models (WAMs) improve robot policy learning by jointly modeling future visual dynamics and actions. However, their scalability and generalization remain constrained by their reliance on costly expert demonstrations. We challenge this by asking whether future supervision for WAMs must originate from target-task expert trajectories. In this paper, we propose Vid2WAM, an offline distillation framework that transfers visual diffusion priors from a large video foundation model into a compact WAM student. Given an observation and language instruction, Vid2WAM distills supervision through two complementary channels: task-conditioned future rollouts directly supervise the student's future prediction branch, while an inverse dynamics model recovers embodiment-specific pseudo-actions for action learning. To robustly integrate synthetic and real supervision, we introduce source-aware residual action adaptation that learns source-specific corrections around a shared action backbone and mitigates interference from noisy pseudo-actions. During inference, both the video teacher and inverse dynamics model are discarded, leaving only the WAM student for efficient deployment. Simulation and real-world experiments demonstrate that Vid2WAM improves novel-task generalization and data efficiency under limited expert demonstrations while preserving low-latency inference.
