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Zero-shot classification with unseen prototype learning

  • S.I. : New Trends of Neural Computing for Advanced Applications
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Abstract

Zero-shot learning (ZSL) aims at recognizing instances from unseen classes via training a classification model with only seen data. Most existing approaches easily suffer from the classification bias from unseen to seen categories since the models are only trained with seen data. In this paper, we tackle the task of ZSL with a novel Unseen Prototype Learning (UPL) model, which is a simple yet effective framework to learn visual prototypes for unseen categories from the corresponding class-level semantic information, and the learned features are treated as latent classifiers directly. Two types of constraints are proposed to improve the performance of the learned prototypes. Firstly, we utilize an autoencoder framework to learn visual prototypes from the semantic prototypes and reconstruct the original semantic information by a decoder to ensure the prototypes have a strong correlation with the corresponding categories. Secondly, we employ a triplet loss to make the average of visual features per class supervise the learned visual prototypes. In this way, the visual prototypes are more discriminative and as a result, the classification bias problem can be alleviated well. Besides, based on the episodic training paradigm in meta-learning, the model can accumulate wealthy experiences in predicting unseen classes. Extensive experiments on four datasets under both traditional ZSL and generalized ZSL show the effectiveness of our proposed UPL method.

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Acknowledgements

This research is partially supported by the Fundamental Research Funds for the Central Universities 2020QNA5010 and the National Natural Science Foundation of China under Grant 61771329 and Grant 62002320, the Central Funds Guiding the Local Science and Technology Development (Grant No. 206Z5001G).

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Correspondence to Yunlong Yu.

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We wish to draw the attention of the Editor to the following facts which may be considered as potential conflict of interest and to significant financial contributions to this work. We wish to confirm that there are no known conflicts of interest associated with this publication and there has been no significant financial support for this work that could have influenced its outcome.

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We confirm that the manuscript has been read and approved by all named authors. We further confirm that the order of authors listed in the manuscript has been approved by all of us. The roles of all authors are listed as follows: Zhong Ji contributed to conceptualization and writing—review. Biying Cui contributed to software and writing—original draft. Yunlong Yu (Corresponding author) contributed to methodology and supervision. Yanwei Pang contributed to writing—review and editing. Zhongfei Zhang contributed to writing—review and editing.

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Ji, Z., Cui, B., Yu, Y. et al. Zero-shot classification with unseen prototype learning. Neural Comput & Applic 35, 12307–12317 (2023). https://doi.org/10.1007/s00521-021-05746-9

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