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arXiv 2406.00436math.OC
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一种用于非线性约束优化的计算高效弧搜索内点算法

A computationally efficient arc-search interior-point algorithm for nonlinear constrained optimization

Yaguang Yang

AI总结:

本文提出一种计算高效的非线性约束优化弧搜索内点算法,利用二阶导数构造搜索弧,通过复用首个线性方程组的矩阵分解降低计算成本,证明了收敛性且初步测试验证了其优势。

摘要:

本文针对非线性约束优化问题,提出了一种弧搜索内点算法。该算法利用二阶导数构造一条趋近最优解的搜索弧。由于这条弧在可行内点集内的停留时间长于任意直线,预计该方法能生成比线搜索方法更优的新迭代点。二阶导数的计算需要求解第二个线性方程组,但第二个线性方程组的系数矩阵与第一个线性方程组完全相同,因此求解第一个线性方程组时得到的矩阵分解结果可被重复利用。此外,第二个线性方程组右端项向量的大部分元素在组装系数矩阵时就已完成计算,因此求解第二个线性方程组的计算成本极低,采用更优搜索方案带来的收益完全能够覆盖这部分开销。本文证明了所提算法的收敛性,并报告了若干初步测试结果,以验证该算法的优势。

英文摘要:

This paper proposes an arc-search interior-point algorithm for the nonlinear constrained optimization problem. The proposed algorithm uses the second-order derivatives to construct a search arc that approaches the optimizer. Because the arc stays in the interior set longer than any straight line, it is expected that the scheme will generate a better new iterate than a line search method. The computation of the second-order derivatives requires to solve the second linear system of equations, but the coefficient matrix of the second linear system of equations is the same as the first linear system of equations. Therefore, the matrix decomposition obtained while solving the first linear system of equations can be reused. In addition, most elements of the right-hand side vector of the second linear system of equations are already computed when the coefficient matrix is assembled. Therefore, the computation cost for solving the second linear system of equations is insignificant and the benefit of having a better search scheme is well justified. The convergence of the proposed algorithm is established. Some preliminary test results are reported to demonstrate the merit of the proposed algorithm.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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