An Empirical Study and Analysis of Generalized Zero-Shot Learning for Object Recognition in the Wild
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Abstract (arXiv)
Zero-shot learning (ZSL) methods have been studied in the unrealistic setting where test data are assumed to come from unseen classes only. In this paper, we advocate studying the problem of generalized zero-shot learning (GZSL) where the test data's class memberships are unconstrained. We show empirically that naively using the classifiers constructed by ZSL approaches does not perform well in the generalized setting. Motivated by this, we propose a simple but effective calibration method that can be used to balance two conflicting forces: recognizing data from seen classes versus those from unseen ones. We develop a performance metric to characterize such a trade-off and examine the utility of this metric in evaluating various ZSL approaches. Our analysis further shows that there is a large gap between the performance of existing approaches and an upper bound established via idealized semantic embeddings, suggesting that improving class semantic embeddings is vital to GZSL.
Key facts. Cited by 146 papers in the map (data through 7 Oct 2026). First posted on arXiv 13 May 2016.
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Citing papers per year: 2021: 49; 2022: 36; 2023: 30; 2024: 14; 2025: 14; 2026: 3.
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