Do LiDAR Language Models Really Understand Spatio-temporal Relationships?
Recent 4D LiDAR language models aim to reason about objects and their evolving spatial relationships. Yet, in our evaluation, always selecting the same option nearly matches the multiple-choice accuracy of two B4DL-derived configurations. We introduce LiDAR-Hallu, a geometry-referenced benchmark and diagnostic protocol...
Run-Yi Yang, Murat Akkoyun, Di Wen et al.
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