Abstract
As an emerging research topic in the field of machine learning, unsupervised domain adaptation (UDA) aims to transfer prior knowledge from the source domain to help training the unsupervised target domain model. Although a variety of UDA works have been proposed, they mainly concentrate on scenarios from one source to one target (1S1T) or multi-source to one target domain (mS1T), the works on UDA from one source to multi-target (1SmT) is rare and they are mainly designed for ordinary problems. When countered with ordinal 1SmT tasks where there exists order relationship among the data labels, the existing methods degenerate in performance since the label relationships are not preserved. In this article, we propose an ordinal 1SmT UDA model which transfers both explicit and implicit knowledge from the supervised source and unsupervised target domains respectively via distribution alignment and dictionary transmission. We also design an efficient algorithm to solve the model and evaluate its convergence and complexity. Finally, the effectiveness of the proposed method is evaluated with extensive experiments.







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Acknowledgements
This work was supported by the National Natural Science Foundation of China under Grant 62176128, the Open Projects Program of State Key Laboratory for Novel Software Technology of Nanjing University under Grant KFKT2022B06, the Fundamental Research Funds for the Central Universities No. NJ2022028, the Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) fund, as well as the Qing Lan Project.
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Tian, Q., Sun, H., Chu, Y. et al. Ordinal unsupervised multi-target domain adaptation with implicit and explicit knowledge exploitation. Int. J. Mach. Learn. & Cyber. 13, 3807–3820 (2022). https://doi.org/10.1007/s13042-022-01626-3
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DOI: https://doi.org/10.1007/s13042-022-01626-3