14 research outputs found
From source to target and back: symmetric bi-directional adaptive GAN
The effectiveness of generative adversarial approaches in producing images
according to a specific style or visual domain has recently opened new
directions to solve the unsupervised domain adaptation problem. It has been
shown that source labeled images can be modified to mimic target samples making
it possible to train directly a classifier in the target domain, despite the
original lack of annotated data. Inverse mappings from the target to the source
domain have also been evaluated but only passing through adapted feature
spaces, thus without new image generation. In this paper we propose to better
exploit the potential of generative adversarial networks for adaptation by
introducing a novel symmetric mapping among domains. We jointly optimize
bi-directional image transformations combining them with target self-labeling.
Moreover we define a new class consistency loss that aligns the generators in
the two directions imposing to conserve the class identity of an image passing
through both domain mappings. A detailed qualitative and quantitative analysis
of the reconstructed images confirm the power of our approach. By integrating
the two domain specific classifiers obtained with our bi-directional network we
exceed previous state-of-the-art unsupervised adaptation results on four
different benchmark datasets
Domain Adaptation with Incomplete Target Domains
Domain adaptation, as a task of reducing the annotation cost in a target
domain by exploiting the existing labeled data in an auxiliary source domain,
has received a lot of attention in the research community. However, the
standard domain adaptation has assumed perfectly observed data in both domains,
while in real world applications the existence of missing data can be
prevalent. In this paper, we tackle a more challenging domain adaptation
scenario where one has an incomplete target domain with partially observed
data. We propose an Incomplete Data Imputation based Adversarial Network
(IDIAN) model to address this new domain adaptation challenge. In the proposed
model, we design a data imputation module to fill the missing feature values
based on the partial observations in the target domain, while aligning the two
domains via deep adversarial adaption. We conduct experiments on both
cross-domain benchmark tasks and a real world adaptation task with imperfect
target domains. The experimental results demonstrate the effectiveness of the
proposed method