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<?php
declare (strict_types = 1);
namespace Phpml\SupportVectorMachine;
abstract class Kernel
{
    /**
     * u'*v.
     */
    const LINEAR = 0;
    /**
     * (gamma*u'*v + coef0)^degree.
     */
    const POLYNOMIAL = 1;
    /**
     * exp(-gamma*|u-v|^2).
     */
    const RBF = 2;
    /**
     * tanh(gamma*u'*v + coef0).
     */
    const SIGMOID = 3;
}