/// <summary>
/// Applies some normal noise to soft sign.
/// </summary>
/// <param name="x"></param>
/// <returns></returns>
public static double NoisySoftSign(double x)
{
if (x < 0)
{
return((2 * (Math.Exp(x) / (1 + Math.Exp(x))) - 1) + StaticRandom.Normal(0, 0.2));
}
else
{
return((2 / (1 + Math.Exp(-x)) - 1) + StaticRandom.Normal(0, 0.2));
}
}