Method F

JSAT/src/jsat/classifiers/linear/BBR.java:480–486

(double r, double delta)

    }

    private static double F(double r, double delta)
    {
        if (abs(r) <= delta)
            return 0.25;
        else
            return 1 / (2 + exp(abs(r) - delta) + exp(delta - abs(r)));
    }

    @Override
    public boolean supportsWeightedData()