Looking Outside the Box to Ground Language in 3D Scenes


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. Most language grounding models learn to select the referred object from a pool of object proposals provided by a pre-trained detector. This object proposal bottleneck is limiting because an utterance may refer to visual entities at various levels of granularity, such as the chair, the leg of a chair, or the tip of the front leg of a chair, which may be missed by the detector. Recently, MDETR [26] introduced a language grounding model for 2D images that does not have such a box proposal bottleneck; instead of selecting objects from a proposal pool, it instead decodes the referenced object boxes directly from image and language features, and achieves big leaps in performance. We propose a language grounding model for 3D scenes built on MDETR, which we call BEAUTY-DETR, from bottom-up and top-down DETR. BEAUTY-DETR attends on an additional object proposal pool computed bottom-up from a pre-trained detector. Yet it decodes referenced objects without selecting them from the pool. In this way it uses power-ful object detectors to help ground language without being restricted by their misses. Second, BEAUTY-DETR augments supervision from language grounding annotations by configuring object detection annotations as language prompts to be grounded in images. The proposed model sets a new state-of-the-art across popular 3D language grounding benchmarks with significant performance gains over previous 3D approaches (12.6% on SR3D, 11.6% on NR3D and 6.3% on ScanRefer). It outperforms a straightforward MDETR for 3D point clouds method we implemented by 6.7% on SR3D, 11.8% on NR3D and 5% on ScanRefer benchmark. When applied on language grounding in 2D images, it performs on par with MDETR. We ablate each of the design choices of the model and quantify their contribution to performance. Code and checkpoints are available at https://github.com/nickgkan/beauty_detr
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