Related papers: Restricted Generative Projection for One-Class Classification and Anomaly Detection

Restricted Generative Projection for One-Class Classification and Anomaly Detection

URL: http://arxiv.org/abs/2307.04097v1
Date: Sun, 9 Jul 2023 04:59:10 GMT
Title: Restricted Generative Projection for One-Class Classification and Anomaly Detection
Authors: Feng Xiao, Ruoyu Sun, Jicong Fan
Abstract summary: We learn a mapping to transform the unknown distribution of training (normal) data to a known target distribution. The simplicity is to ensure that we can sample from the distribution easily. The compactness is to ensure that the decision boundary between normal data and abnormal data is clear. The informativeness is to ensure that the transformed data preserve the important information of the original data.
Score: 31.173234437065464
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: We present a simple framework for one-class classification and anomaly detection. The core idea is to learn a mapping to transform the unknown distribution of training (normal) data to a known target distribution. Crucially, the target distribution should be sufficiently simple, compact, and informative. The simplicity is to ensure that we can sample from the distribution easily, the compactness is to ensure that the decision boundary between normal data and abnormal data is clear and reliable, and the informativeness is to ensure that the transformed data preserve the important information of the original data. Therefore, we propose to use truncated Gaussian, uniform in hypersphere, uniform on hypersphere, or uniform between hyperspheres, as the target distribution. We then minimize the distance between the transformed data distribution and the target distribution while keeping the reconstruction error for the original data small enough. Comparative studies on multiple benchmark datasets verify the effectiveness of our methods in comparison to baselines.