However, the PRP method even with the exact line search is not globally convergent on nonconvex functions.
然而，对一般非凸函数，PRP方法即使采用精确线搜索也不能保证全局收敛。
The method is proved to be globally convergent if the exact line search, the Grippo-Lucidi line search and the Wolfe-Powell line search is used.
文章给出了一种新的非精确线性搜索下的共轭梯度法，说明了在新线性搜索下每次迭代能够产生下降方向。
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