Function test_problems

dlib/test/trust_region.cpp:266–369

// ----------------------------------------------------------------------------------------

    void test_problems()
    {
        print_spinner();
        {
            matrix<double,4,1> ch;

            ch = brown_start();

            find_min_trust_region(objective_delta_stop_strategy(1e-7, 80),
                                  brown_function_model(),
                                  ch);

            dlog << LINFO << "brown obj: " << brown(ch);
            dlog << LINFO << "brown der: " << length(brown_derivative(ch));
            dlog << LINFO << "brown error: " << length(ch - brown_solution());

            DLIB_TEST(length(ch - brown_solution()) < 1e-5);

        }
        print_spinner();
        {
            matrix<double,2,1> ch;

            ch = rosen_start<double>();

            find_min_trust_region(objective_delta_stop_strategy(1e-7, 80),
                                  rosen_function_model<double>(),
                                  ch);

            dlog << LINFO << "rosen obj: " << rosen(ch);
            dlog << LINFO << "rosen der: " << length(rosen_derivative(ch));
            dlog << LINFO << "rosen error: " << length(ch - rosen_solution<double>());

            DLIB_TEST(length(ch - rosen_solution<double>()) < 1e-5);
        }

        print_spinner();
        {
            matrix<double,0,1> ch;

            ch = chebyquad_start(2);

            find_min_trust_region(objective_delta_stop_strategy(1e-7, 80),
                                  chebyquad_function_model(),
                                  ch);

            dlog << LINFO << "chebyquad 2 obj: " << chebyquad(ch);
            dlog << LINFO << "chebyquad 2 der: " << length(chebyquad_derivative(ch));
            dlog << LINFO << "chebyquad 2 error: " << length(ch - chebyquad_solution(2));

            DLIB_TEST(length(ch - chebyquad_solution(2)) < 1e-5);

        }
        print_spinner();
        {
            matrix<double,0,1> ch;

            ch = chebyquad_start(4);