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。
However, the PRP method even with the exact line search is not globally convergent on nonconvex functions.
在较为温和的条件下，利用宽松的非精确线搜索条件得到全局收敛性结果，同时数值实验表明了算法的有效性。
Underan inexact line search condition and some other mild conditions, the global convergence was established. Preliminary numerical results show that the proposed method is promsing.
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