Method operator()

dlib/svm/sparse_kernel.h:209–215

        const scalar_type coef;

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

        sparse_sigmoid_kernel& operator= (
            const sparse_sigmoid_kernel& k