Generative gradual domain adaptation with optimal transport
He, Yifei
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Permalink
https://hdl.handle.net/2142/120378
Description
Title
Generative gradual domain adaptation with optimal transport
Author(s)
He, Yifei
Issue Date
2023-04-17
Director of Research (if dissertation) or Advisor (if thesis)
Zhao, Han
Department of Study
Computer Science
Discipline
Computer Science
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
Domain adaptation
distribution Shift
Abstract
Unsupervised domain adaptation (UDA) adapts a model from a labeled source domain to an unlabeled target domain in a one-off way. Though widely applied, UDA faces a great challenge whenever the distribution shift between the source and the target is large. Gradual domain adaptation (GDA) mitigates this limitation by using intermediate domains to gradually adapt from the source to the target domain. However, it remains an open problem on how to leverage this paradigm when the given intermediate domains are missing or scarce. To approach this practical challenge, we propose Generative Gradual DOmain Adaptation with Optimal Transport (GOAT), an algorithmic framework that can generate intermediate domains in a data-dependent way. More concretely, we first generate intermediate domains along the Wasserstein geodesic between two given consecutive domains in a feature space, and apply gradual self-training, a standard GDA algorithm, to adapt the source-trained classifier to the target along the sequence of intermediate domains. Empirically, we demonstrate that our GOAT framework can improve the performance of standard GDA when the given intermediate domains are scarce, significantly broadening the real-world application scenarios of GDA.
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