public double Derivative(double x, double gain, double center)
{
double y;
if (gain == 1)
{
double fx = HyperbolicTangentFunction.CommonActivation(x, gain, center);
y = 1 - (fx * fx);
}
else
{
double xc = x - center;
double exp = Math.Exp(-2 * (gain * xc));
double expP1 = 1 + exp;
y = 4 * gain * exp / (expP1 * expP1);
}
return(y);
}
public double Activation(double x, double gain, double center)
{
return(HyperbolicTangentFunction.CommonActivation(x, gain, center));
}
