fig4

Figure 4. Types and frequency of algorithms implemented in the included studies. LR: Logistic regression; NN: neural network; ANN: artificial neural network; MLP: multilayer perceptron; RF: random forest; SVM: support vector machine; XGB: eXtreme gradient boosting; KNN: k-nearest neighbor; GBRT: gradient boosted regression tree; LDA: linear discriminant analysis; QDA: quadratic discriminant analysis, CNN: convoluted neural network; RNN: recurrent neural network; BPN: backpropagation neural network; DT: decision tree; ML: machine learning.