bfgs                    Broyden-Fletcher-Goldfarb-Shanno (BFGS)
                        Optimization
dogleg                  Dogleg Trust-Region Optimization
double_dogleg           Double Dogleg Trust-Region Optimization
fast_grad               Fast Numerical Gradient
fast_hess               Fast Numerical Hessian
fast_jac                Fast Numerical Jacobian
gauss_newton            Gauss-Newton Optimization
is_pd_fast              Fast Positive Definiteness Check
l_bfgs_b                Limited-memory BFGS with Box Constraints
                        (L-BFGS-B)
modified_newton         Modified Newton-Raphson Optimization
newton_raphson          Pure Newton-Raphson Optimization
