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September 20, 2025

OT-DETECTOR: Delving into Optimal Transport for Zero-shot Out-of-Distribution Detection

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OT-DETECTOR achieves state-of-the-art ood detection performance, especially in hard-ood scenarios.
The introduction of cross-modal transport mass and transport cost enhances semantic-wise and distribution-wise ood scores.
The semantic-aware content refinement module amplifies discrepancies between in-distribution and ood samples.
Extensive experiments validate the effectiveness of OT-DETECTOR on multiple ood detection benchmarks.

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OT-DETECTOR enhances ood detection using optimal transport to improve semantic matching and distributional discrepancies.

Liu et al. (2025) studied this question.

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