SAVLA: ロボットマニピュレーションのための対称性を考慮した視覚-言語-行動モデル
SAVLA: Symmetry-Aware Vision-Language-Action Models for Robotic Manipulation
事前学習済みの視覚言語モデルを固定し、同変フローマッチング行動ヘッドと正規化器を組み合わせることで、データ効率が高く回転に頑健なロボット操作ポリシーを実現した。
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著者: Junle Li, Weixian Waylon Li, Fuxiang Wu, Fusheng Hao, Fengxiang He
分類: cs.RO
原文アブストラクト
Vision-language-action (VLA) models have become the dominant paradigm for language-conditioned robot manipulation. However, although images and language instructions inherently encode geometric information, VLAs acquire their spatial competence purely from demonstrations. As a result, they are reliable only within the range of scene poses that the demonstrations cover. We propose SAVLA, an end-to-end symmetry-aware VLA model for robust and data-efficient policy learning. Our approach keeps the pretrained vision-language backbone entirely frozen while combining it with an equivariant flow-matching action head and a learned canonicalizer. The head decomposes its state, action, and conditioning inputs into invariant and equivariant channels, and preserves this typing throughout all of its layers. The canonicalizer transforms oblique-view images into a canonical frame and rotates the geometric conditions consistently. We evaluate our model on LIBERO. Compared with the GR00T N1.5 baseline, SAVLA improves the success rate averaged over all four LIBERO suites by 5.1 points and increases the mean success rate under rotation on LIBERO-Goal from 41.5% to 90.4%.