TRACE: Transparent Retrieval for Abstract Concept Evaluation
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Abstract (arXiv)
Recent work reports that vision--language models (VLMs) struggle to establish and maintain stable reference in repeated reference games. Rather than ask which VLM does best, we ask a more basic question: do you need a large pretrained VLM for this at all? On grounding a single director utterance to one of twelve tangram silhouettes, we compare six off-the-shelf VLMs against a transparent baseline that uses no learned visual representation: classical SIFT keypoint matching and a signal-quality index over retrieved images. On identical trials, the transparent baseline matches the strongest VLM (SigLIP-large) and significantly outperforms the other five, including every CLIP and OpenCLIP variant. The baseline additionally retrieves external images, so this is not a matched-information comparison; what it shows is that a learned visual representation is not the bottleneck for this task: given retrieved images, a shape-appropriate classical similarity suffices. Along the way we find that abstract-grounding ability varies widely across VLMs (15--39% top-1; chance 8.33%, humans ≈77--80%), so the weakness is model-specific rather than intrinsic to contrastive pretraining; on the 1,013-shape KiloGram benchmark the pattern generalizes for CLIP, with per-shape difficulty tracking human shape-nameability. The pipeline is a classical, inspectable alternative rather than a learned one. We close by sketching how an explicit, inspectable representation of listener-side pact state could carry this approach into interactive multi-turn reference, which we leave to future work. Code available in supplementary material.
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References · 13
- 2023Sigmoid Loss for Language Image Pre-Trainingcited by 3,109
- 2022When and why vision-language models behave like bags-of-words, and what to do about it?cited by 610
- 2020Emergent Multi-Agent Communication in the Deep Learning Eracited by 170
- 2022Abstract Visual Reasoning with Tangram Shapescited by 43
- 2019Characterizing the dynamics of learning in repeated reference gamescited by 34
- 2022ComCLIP: Training-Free Compositional Image and Text Matchingcited by 26
- 2025Measuring How (Not Just Whether) VLMs Build Common Groundcited by 8
- 2026LVLMs and Humans Ground Differently in Referential Communicationcited by 8
- 2024Language Evolution with Deep Learningcited by 5
- 2026Gesturing Toward Abstraction: Multimodal Convention Formation in Collaborative Physical Taskscited by 4
- 2025The Perceptual Observatory Characterizing Robustness and Grounding in MLLMscited by 3
- 2025Compositional Image-Text Matching and Retrieval by Grounding Entitiescited by 1
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- 2025PairBench: Are Vision-Language Models Reliable at Comparing What They See?