By Guansong Pang, Chunhua Shen, Anton van den Hengel. Deep anomaly detection with deviation networks (KDD19).

PyTorch implementation is released at DevNet-PyTorch. The method is extended with some additional modules and evaluated on image datasets. It offers faithful anomaly explanation and performs effectively in open-set anomaly detection settings where there are unseen anomaly classes during testing.

Deviation network (DevNet) is introduced in our KDD19 paper, which leverages a limited number of labeled anomaly data and a large set of unlabeled data to perform end-to-end anomaly score learning. It addresses a weakly supervised anomaly detection problem in that the anomalies are partially observed only and we have no labeled normal data.

Unlike other deep anomaly detection methods that focus on using data reconstruction as the driving force to learn new representations, DevNet is devised to learn the anomaly scores directly. Therefore, DevNet directly optimize the anomaly scores, whereas most of current deep anomaly detection methods optimize the feature representations. The resulting DevNet model achieves significantly better anomaly scoring than the competing deep methods. Also, due to the end-to-end anomaly scoring, DevNet can also exploit the labeled anomaly data much more effectively.

A simple example of running DevNet is shown as follows.

python devnet_kdd19.py --network_depth=2 --runs=10 --known_outliers=30 --cont_rate=0.02 --data_format=0 --output=./results.csv --dataset=`annthyroid_21feat_normalised`

See devnet_kdd19.py for more details about each argument used in this line of code.

The key packages and their versions used in our algorithm implementation are listed as follows

• python==3.6.6
• keras==2.2.4
• tensorflow-gpu==1.10.0
• scikit-learn==0.20.0
• numpy==1.14.5
• pandas==0.23.4
• scipy==1.1.0
• tensorboard==1.10.0

See the full paper below for the implemenation details of DevNet.

The full paper can be found at ACM Portal or arXiv

The datasets used in DevNet are also released here. See our anomaly detection dataset repository ADRepository for more preprocessed datasets that are widely-used in other papers.

@inproceedings{pang2019deep,
  title={Deep anomaly detection with deviation networks},
  author={Pang, Guansong and Shen, Chunhua and van den Hengel, Anton},
  booktitle={Proceedings of the 25th ACM SIGKDD international conference on knowledge discovery \& data mining},
  pages={353--362},
  year={2019}
}