拡散ポリシーに对称性を組み込むための実践的ガイド
A Practical Guide for Incorporating Symmetry in Diffusion Policy
拡散ポリシーに完全な同変設計を必要とせず、不変表現や同変視覚エンコーダ、フレーム平均化などの実践的手法で対称性の利点を組み込む方法を検討し、その有効性を実験的に示した。
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著者: Dian Wang, Boce Hu, Shuran Song, Robin Walters, Robert Platt
分類: cs.RO
原文アブストラクト
Recently, equivariant neural networks for policy learning have shown promising improvements in sample efficiency and generalization, however, their wide adoption faces substantial barriers due to implementation complexity. Equivariant architectures typically require specialized mathematical formulations and custom network design, posing significant challenges when integrating with modern policy frameworks like diffusion-based models. In this paper, we explore a number of straightforward and practical approaches to incorporate symmetry benefits into diffusion policies without the overhead of full equivariant designs. Specifically, we investigate (i) invariant representations via relative trajectory actions and eye-in-hand perception, (ii) integrating equivariant vision encoders, and (iii) symmetric feature extraction with pretrained encoders using Frame Averaging. We first prove that combining eye-in-hand perception with relative or delta action parameterization yields inherent SE(3)-invariance, thus improving policy generalization. We then perform a systematic experimental study on those design choices for integrating symmetry in diffusion policies, and conclude that an invariant representation with equivariant feature extraction significantly improves the policy performance. Our method achieves performance on par with or exceeding fully equivariant architectures while greatly simplifying implementation.
