Contrastive learning based open-set recognition with unknown score

doi:10.1016/j.knosys.2024.111926

Contrastive learning based open-set recognition with unknown score

2024-07-01

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AI

DOI：10.1016/j.knosys.2024.111926

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Abstract

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Open -set recognition (OSR) is designed to classify the seen classes and identify the unseen classes as unknown. However, existing open -set classifiers rely on deep networks trained using supervised learning techniques for known classes present in the training samples. This factor tends to specialize the learned features of the model toward known classes, making it challenging to differentiate between unknown classes. In this study, we propose a novel open -set recognition framework based on contrastive learning with an unknown score. First, we propose a novel training framework based on contrastive learning to learn more informative features and preserve beneficial information to separate unknown from known. Second, we propose an unknown score function based on multi -layer features to detect unknown samples by considering the difference between the known and unknown classes of intermediate -layer features. Based on extensive experiments conducted on multiple benchmark datasets, the proposed method has been demonstrated to outperform existing methods and achieve state-of-the-art results.

Keywords:

Classification

Open-set recognition

Contrastive learning

Unknown score

Contrastive learning based open-set recognition with unknown score

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