VAE-GAN based zero-shot outlier detection

BI Ibrahim, DC Nicolae, A Khan, SI Ali… - Proceedings of the 2020 …, 2020 - dl.acm.org
Proceedings of the 2020 4th international symposium on computer science and …, 2020dl.acm.org
Outlier detection is one of the main fields in machine learning and it has been growing
rapidly due to its wide range of applications. In the last few years, deep learning-based
methods have outperformed machine learning and handcrafted outlier detection techniques,
and our method is no different. We present a new twist to generative models which
leverages variational autoencoders as a source for uniform distributions which can be used
to separate the inliers from the outliers. Both the generative and adversarial parts of the …
Outlier detection is one of the main fields in machine learning and it has been growing rapidly due to its wide range of applications. In the last few years, deep learning-based methods have outperformed machine learning and handcrafted outlier detection techniques, and our method is no different. We present a new twist to generative models which leverages variational autoencoders as a source for uniform distributions which can be used to separate the inliers from the outliers. Both the generative and adversarial parts of the model are used to obtain three main losses (Reconstruction loss, KL-divergence, Discriminative loss) which in return are wrapped with a one-class SVM which is used to make the predictions. We evaluated our method against several datasets both for images and tabular data and it has shown great results for the zero-shot outlier detection problem and was able to easily generalize it for supervised outlier detection tasks on which the performance has increased. For comparison, we evaluated our method against several of the common outlier detection techniques such as DBSCAN-based outlier detection, GMM, K-means and one class SVM directly, and we have outperformed all of them on all datasets.
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