Anomaly Detection using One-Class Neural Networks
Abstract
We propose a one-class neural network (OC-NN) model to detect anomalies in complex data sets. OC-NN combines the ability of deep networks to extract a progressively rich representation of data with the one-class objective of creating a tight envelope around normal data. The OC-NN approach breaks new ground for the following crucial reason: data representation in the hidden layer is driven by the OC-NN objective and is thus customized for anomaly detection. This is a departure from other approaches which use a hybrid approach of learning deep features using an autoencoder and then feeding the features into a separate anomaly detection method like one-class SVM (OC-SVM). The hybrid OC-SVM approach is sub-optimal because it is unable to influence representational learning in the hidden layers. A comprehensive set of experiments demonstrate that on complex data sets (like CIFAR and GTSRB), OC-NN performs on par with state-of-the-art methods and outperformed conventional shallow methods in some scenarios.
Cite
@article{arxiv.1802.06360,
title = {Anomaly Detection using One-Class Neural Networks},
author = {Raghavendra Chalapathy and Aditya Krishna Menon and Sanjay Chawla},
journal= {arXiv preprint arXiv:1802.06360},
year = {2019}
}