Method operator()

dlib/svm/kernel.h:266–272

        const scalar_type coef;

        scalar_type operator() (
            const sample_type& a,
            const sample_type& b
        ) const
        { 
            return std::tanh(gamma*(trans(a)*b) + coef);
        }

        sigmoid_kernel& operator= (
            const sigmoid_kernel& k