RoboIRGBench:視覚言語行動モデルにおける暗黙的指示対象接地のベンチマーク
RoboIRGBench: Benchmarking Implicit Referential Grounding in Vision-Language-Action Models
ロボット操作における視覚言語行動モデルが、指示に明示されない暗黙的な対象・数量・関係を文脈から推論する能力を評価するベンチマークRoboIRG-Benchを提案し、既存モデルに顕著な性能低下があることを示した。
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著者: Aernaer Akelijiang, Jiannan Li, Zhineng Chen, Jingjing Chen, Bin Zhu
分類: cs.RO, cs.CV
原文アブストラクト
Vision-Language-Action (VLA) models have shown strong capabilities in robotic manipulation, yet existing benchmarks typically assume that task-relevant information is explicitly specified in the instruction. In practice, however, humans frequently refer to objects, quantities, and relations implicitly, requiring robots to recover the intended target from linguistic and perceptual context. We study this capability as Implicit Referential Grounding (IRG) and introduce RoboIRG-Bench, a manipulation benchmark designed to systematically evaluate it. Built upon RoboMME, RoboIRG-Bench contains 40 variants derived from 11 tasks and covers four challenges, including direct, reasoning-mediated, spatial, and contextual referential grounding. As IRG often requires retaining and retrieving previously established context, we evaluate representative VLAs spanning different memory mechanisms. Our evaluation reveals a noticeable referential robustness gap. Models that perform well under explicit instructions can degrade sharply when the same task-relevant information must be recovered from context. Reasoning-mediated and spatial references are particularly challenging, while models using external VLMs show greater robustness but still exhibit significant failures. Moreover, replacing the external VLM with a stronger model does not eliminate these gaps. We further validate these findings on a Franka Research 3 robot arm, where the gap persists under real-world manipulation and manifests as both incorrect referent grounding and downstream execution failures. These results establish IRG as a distinct and underexplored capability for reliable robotic instruction following and highlight the need for VLAs that can robustly integrate language, perception, reasoning, and action.