Fig. 15

Evolution of the popularity of methods regarding anomaly detection over the years. ESD stands for Extreme Studentized Deviate, PCA for Principal Component Analysis, rPCA for Robust Principal Component Analysis, MCD for Minimum Covariance Determinant, KNN for k-Nearest Neighbors, NB for Naive Bayes, SVM for Support Vector Machine, DT for Decision Trees (and includes random forest), ANN for Artificial Neural Network, FNN for Feedforward Neural Network, LSTM for Long Short-Term Memory, RNN for Recurrent Neural Network, CNN for Convolution Neural Network, SOM for Self-Organizing-Maps, RBM for Restricted Boltzmann Machines, AE for Autoencoder and DBSCAN for Density-Based Spatial Clustering of Applications with Noise