FloMo: 人間動画からの学習におけるワールドアクションモデル中間表現としての3Dシーンフロー
FloMo: 3D Scene Flow as a World Action Model Intermediate for Learning from Human Video
動画生成モデルを3Dシーンフローとアクショントークンの予測に微調整し、人間動画とロボット操作データで共訓練することで、未見物体やタスクへの汎化を実現した研究。
詳しい要約
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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: Jeremy Collins, Namra Patel, Ayush Agarwal, Shitij Govil, Animesh Garg
分類: cs.CV, cs.AI
原文アブストラクト
Pretrained video generation models distill internet-scale motion priors into robot policies, but full video is a redundant signal for action prediction. We argue that dense 3D motion is the medium through which video pretraining best transfers to robot actions, and that predicting motion rather than video affords better sample-efficiency for action prediction. FloMo is a 5B video-generation model fine-tuned to predict 3D scene-flow and action tokens. Rendering scene flow as RGB and encoding it into the same latent space as video enables a pretrained video generation backbone to efficiently adapt to predict 3D scene flow. Co-trained on action-free human video and action-labeled robot teleoperation data, our model benefits from human-video pretraining and generalizes to unseen objects, motion primitives, and tasks. Replacing motion prediction with a video prediction objective degrades out-of-distribution generalization, while adding a video prediction target alongside motion lowers policy success rather than improving it. When motion, video, and action are predicted jointly, action tokens attend far more to motion than to video, suggesting that predicting video wastes model capacity. Together, these results indicate that motion effectively mediates the transfer from video pretraining to action. More information can be found at flomo-wam.github.io.