推論時拡散スケーリングによる合成的視覚プランニング
Compositional Visual Planning via Inference-Time Diffusion Scaling
短時間の動画拡散モデルを組み合わせて長時間のロボットプランを生成する際、ノイズ付き中間状態ではなく推定クリーンデータ（Tweedie推定）で境界整合性を強制する新しい推論手法を提案し、追加学習なしで未見の開始・目標組み合わせに一般化できることを示した。
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著者: Yixin Zhang, Yunhao Luo, Utkarsh Aashu Mishra, Woo Chul Shin, Yongxin Chen, Danfei Xu
分類: cs.RO
原文アブストラクト
Diffusion models excel at short-horizon robot planning, yet scaling them to long-horizon tasks remains challenging due to computational constraints and limited training data. Existing compositional approaches stitch together short segments by separately denoising each component and averaging overlapping regions. However, this suffers from instability as the factorization assumption breaks down in noisy data space, leading to inconsistent global plans. We propose that the key to stable compositional generation lies in enforcing boundary agreement on the estimated clean data (Tweedie estimates) rather than on noisy intermediate states. Our method formulates long-horizon planning as inference over a chain-structured factor graph of overlapping video chunks, where pretrained short-horizon video diffusion models provide local priors. At inference time, we enforce boundary agreement through a novel combination of synchronous and asynchronous message passing that operates on Tweedie estimates, producing globally consistent guidance without requiring additional training. Our training-free framework demonstrates significant improvements over existing baselines, effectively generalizing to unseen start-goal combinations that were not present in the original training data. Project website: https://comp-visual-planning.github.io/
