1<?php
2
3declare(strict_types=1);
4
5namespace Phpml\SupportVectorMachine;
6
7abstract class Kernel
8{
9    /**
10     * u'*v.
11     */
12    public const LINEAR = 0;
13
14    /**
15     * (gamma*u'*v + coef0)^degree.
16     */
17    public const POLYNOMIAL = 1;
18
19    /**
20     * exp(-gamma*|u-v|^2).
21     */
22    public const RBF = 2;
23
24    /**
25     * tanh(gamma*u'*v + coef0).
26     */
27    public const SIGMOID = 3;
28}
29