| Acc | Accuracy | 
| Acc_rnd | Accuracy of a random model | 
| aggregate_imp | Aggregate importances | 
| Aitchison | Compositional kernels | 
| Boots_CI | Confidence Interval using Bootstrap | 
| BrayCurtis | Kernels for count data | 
| centerK | Centering a kernel matrix | 
| centerX | Centering a squared matrix by row or column | 
| Chi2 | Chi-squared kernel | 
| cLinear | Compositional kernels | 
| cosNorm | Cosine normalization of a kernel matrix | 
| cosnormX | Cosine normalization of a matrix | 
| desparsify | This function deletes those columns and/or rows in a matrix/data.frame that only contain 0s. | 
| Dirac | Kernels for categorical variables | 
| dummy_data | Convert categorical data to dummies. | 
| dummy_var | Levels per factor variable | 
| estimate_gamma | Gamma hyperparameter estimation (RBF kernel) | 
| F1 | F1 score | 
| Frobenius | Frobenius kernel | 
| frobNorm | Frobenius normalization | 
| heatK | Kernel matrix heatmap | 
| histK | Kernel matrix histogram | 
| Intersect | Kernels for sets | 
| Jaccard | Kernels for sets | 
| Kendall | Kendall's tau kernel | 
| kPCA | Kernel PCA | 
| kPCA_arrows | Plot the original variables' contribution to a PCA plot | 
| kPCA_imp | Contributions of the variables to the Principal Components ("loadings") | 
| KTA | Kernel-target alignment | 
| Laplace | Laplacian kernel | 
| Linear | Linear kernel | 
| minmax | Minmax normalization | 
| MKC | Multiple Kernel (Matrices) Combination | 
| nmse | NMSE (Normalized Mean Squared Error) | 
| Normal_CI | Confidence Interval using Normal Approximation | 
| plotImp | Importance barplot | 
| Prec | Precision or PPV | 
| Procrustes | Procrustes Analysis | 
| RBF | Gaussian RBF (Radial Basis Function) kernel | 
| Rec | Recall or Sensitivity or TPR | 
| Ruzicka | Kernels for count data | 
| showdata | Showdata | 
| simK | Kernel matrix similarity | 
| soil | Soil microbiota (raw counts) | 
| Spe | Specificity or TNR | 
| Spectrum | Spectrum kernel | 
| svm_imp | SVM feature importance | 
| TSS | Total Sum Scaling | 
| vonNeumann | Von Neumann entropy |