A no-line-search parallel nonlinear conjugate gradient method (NLS-PNCG) for unconstrained optimization is proposed.In this method the step length is evaluated by a fixed formula.

• 摘要给出了一类无需线搜索的无约束最优化并行算法-并行非线性共轭梯度法(NLS-PNCG)，用一个固定的公式来计算搜索步长，较常用的共轭梯度法计算量小。