VLA Models Fail Due to Absolute Workspace Coordinate Binding
October 19, 2026
Interpretability analysis reveals that Vision-Language-Action policies like pi0.5 bind motor trajectories to absolute workspace coordinates rather than visual scene context. Injecting task activations into an action expert successfully redirected a physical UR10e robot to execute a different task in 99.6% of episodes, explaining observed spatial brittleness.
HOW THIS AFFECTS YOU
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builderExpect brittleness in VLA deployments if your models rely on coordinate-bound trajectories rather than visual grounding.
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researcherYou can use this mechanistic approach to diagnose why robotics policies fail during spatial perturbations.