Radial
Properties
| Cubic | Gets a cubic radial basis function kernel: φ(r) = r³. |
| Linear | Gets a linear radial basis function kernel: φ(r) = r. |
| Quintic | Gets a quintic radial basis function kernel: φ(r) = r⁵. |
| Thin | Gets a thin-plate spline radial basis function kernel: φ(r) = r² log(r). |