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Domain adaptation with category-level contrastive learning for semi-supervised cross-modal hashing.

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Title: Domain adaptation with category-level contrastive learning for semi-supervised cross-modal hashing.
Authors: Han, Zhichao1 (AUTHOR) gs61677@student.upm.edu.my, Azman, Azreen1 (AUTHOR) azreenazman@upm.edu.my, Rina Mustaffa, Mas1 (AUTHOR) masrina@upm.edu.my, Khalid, Fatimah1 (AUTHOR) fatimahk@upm.edu.my
Source: Applied Intelligence. Jul2025, Vol. 55 Issue 11, p1-16. 16p.
Abstract: Cross-modal hashing(CMH) is a key technique in information retrieval, valued for its efficiency, low dimensionality, and minimal storage requirements. Despite notable progress in this field, challenges persist, particularly the reliance on large labeled datasets. This paper presents a novel domain adaptation framework that leverages a limited set of labeled data from the source domain to guide the training of a large quantity of unlabeled data in the target domain. Our approach incorporates pseudo-label generation to iteratively refine semantic representations in the target domain, progressively narrowing the semantic gap between domains. Additionally, we propose a category-level contrastive learning(CLCL) method to address class conflict issues common in traditional instance-based contrastive learning. By generating category prototype representations, we enhance the model’s ability to discriminate between categories effectively. Moreover, our framework includes a comprehensive optimization objective that integrates pseudo-label generation loss, contrastive learning loss, and hash code learning loss, ensuring that the generated hash codes are both discrete and discriminative. Experimental results on benchmark datasets demonstrate the superiority of our approach over existing CMH methods. [ABSTRACT FROM AUTHOR]
Copyright of Applied Intelligence is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Cross-modal hashing(CMH) is a key technique in information retrieval, valued for its efficiency, low dimensionality, and minimal storage requirements. Despite notable progress in this field, challenges persist, particularly the reliance on large labeled datasets. This paper presents a novel domain adaptation framework that leverages a limited set of labeled data from the source domain to guide the training of a large quantity of unlabeled data in the target domain. Our approach incorporates pseudo-label generation to iteratively refine semantic representations in the target domain, progressively narrowing the semantic gap between domains. Additionally, we propose a category-level contrastive learning(CLCL) method to address class conflict issues common in traditional instance-based contrastive learning. By generating category prototype representations, we enhance the model’s ability to discriminate between categories effectively. Moreover, our framework includes a comprehensive optimization objective that integrates pseudo-label generation loss, contrastive learning loss, and hash code learning loss, ensuring that the generated hash codes are both discrete and discriminative. Experimental results on benchmark datasets demonstrate the superiority of our approach over existing CMH methods. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Applied Intelligence is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1007/s10489-025-06712-x
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        Text: English
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      – TitleFull: Domain adaptation with category-level contrastive learning for semi-supervised cross-modal hashing.
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            NameFull: Han, Zhichao
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            NameFull: Azman, Azreen
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              Text: Jul2025
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              Y: 2025
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