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Optimal Transport for Domain Adaptation

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Courty Nicolas, Flamary Remi, Tuia Devis, Rakotomamonjy Alain,
Project Multimodal machine learning for remote sensing information fusion
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Original article (peer-reviewed)

Journal IEEE Transactions on Pattern Analysis and Machine Intelligence
Volume (Issue) 39(9)
Page(s) 1853 - 1865
Title of proceedings IEEE Transactions on Pattern Analysis and Machine Intelligence
DOI 10.1109/tpami.2016.2615921

Open Access

Type of Open Access Repository (Green Open Access)


© 2017 IEEE. Domain adaptation is one of the most challenging tasks of modern data analytics. If the adaptation is done correctly, models built on a specific data representation become more robust when confronted to data depicting the same classes, but described by another observation system. Among the many strategies proposed, finding domain-invariant representations has shown excellent properties, in particular since it allows to train a unique classifier effective in all domains. In this paper, we propose a regularized unsupervised optimal transportation model to perform the alignment of the representations in the source and target domains. We learn a transportation plan matching both PDFs, which constrains labeled samples of the same class in the source domain to remain close during transport. This way, we exploit at the same time the labeled samples in the source and the distributions observed in both domains. Experiments on toy and challenging real visual adaptation examples show the interest of the method, that consistently outperforms state of the art approaches. In addition, numerical experiments show that our approach leads to better performances on domain invariant deep learning features and can be easily adapted to the semi-supervised case where few labeled samples are available in the target domain.