Article

NavBind Diagnoses Instruction-Action Binding at Route Forks in Navigation VLA Models

NavBind proposes a method for diagnosing whether navigation vision-language-action (VLA) models truly follow instructions: with the navigation context fixed, it checks whether changing the instruction affects the probability distribution of actions. The authors recombined route-aligned instruction segments from R2R-CE and RxR-CE to construct 3,252 route-fork contexts, each pairing two full instructions that share a description of the route already traveled but specify different branches, and evaluated them under the same agent state and navigation history.

Part of the event: NavBind: Diagnosing Navigation VLA Instruction-Action Binding

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