该软件包CG +是为解决大规模，无约束，非线性优化问题的共轭梯度代码。企业管治+实现了共轭梯度法的三个不同版本：弗莱彻-里夫斯方法，波拉克Ribiere方法的，积极的波拉克-Ribiere方法的（聊天总是非负）-The package CG+ is a Conjugate Gradient code for solving large-scale, unconstrained, nonlinear optimization problems. CG+ implements three different versions of the Conjugate Gradient method: the Fletcher-Reeves method, the Polak-Ribiere method, and the positive Polak-Ribiere method (Beta always non-negative).