Adversarial training of LSTM-ED based anomaly detection for complex time-series in cyber-physical-social systems

With the development and maturity of smart cities, more and more Cyber-Physical-Social Systems (CPSSs) need to monitor a variety of time-series data from sensors and network transmissions to ensure the quality and reliability of the Cyber-Physical-Social Services. Time-series anomaly detection is a common search problem in the field of pattern recognition. Existing approaches and models of anomaly detection have solved the problem of simple smooth time-series and perform ideal recognition performance. However, in real scenarios, complex time-series with non-Gaussian noise and complex data distributions are prevalent. Compared to smooth and simple time-series, complex time-series occur more frequently in real-world settings and are difficult to model and label. To address these challenges, this paper proposes an unsupervised anomaly detection algorithm based on Long Short-Term Memory Encoder-Decoder (LSTM-ED) via an adversarial training method for complex time-series in cyber-physical-social systems with high performance. This is a novel method that incorporates adversarial learning to improve the robustness of encoder-decoder architecture, enabling it to obtain good anomaly detection results for complex time-series. In addition, LSTM is employed as the network unit of encoder-decoder architecture, which is also able to extract temporal correlation in time-series to a greater extent. We have conducted extensive experiments on four datasets from real scenarios and the results show that the accuracy of the proposed adversarial training of LSTM-ED is significantly better than that of the state-of-the-art methods, including other unsupervised methods and traditional supervised methods.