| matrix_diagonal | Softening | 
| nearest_neighbor_adaptive | Discriminant Adaptive Nearest Neighbor Classification | 
| neighborhood | Neighborhood size | 
| sphere | Sphere argument to ncoord | 
| tunable.nearest_neighbor_adaptive | Declare tunable parameters | 
| update.nearest_neighbor_adaptive | Updating a model specification. | 
| weighted | Weighted argument to ncoord |