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arXiv 1807.07563math.OC
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广义置信域子问题的线性时间算法

A linear-time algorithm for generalized trust region subproblems

Rujun Jiang, Duan Li

摘要:

在本文中,我们提供了第一个可证明的线性时间(在输入的非零元素的数目)算法近似解决广义置信域子问题(GTRS)的最小化二次函数在二次约束下在一些正则条件。我们的算法是由Hazan和Koren [Math. Program.,2016,158(1-2):363-381]。然而,由于可行域的非凸性和非紧性,这样的扩展是非平凡的。我们的主要贡献是证明了在一定的正则条件下,最优解是在一个紧凸集上,并且最优值的上界可以在线性时间内计算。利用这些性质,我们开发了一个线性时间算法的GTRS。

英文摘要:

In this paper, we provide the first provable linear-time (in the number of non-zero entries of the input) algorithm for approximately solving the generalized trust region subproblem (GTRS) of minimizing a quadratic function over a quadratic constraint under some regular conditions. Our algorithm is motivated by and extends a recent linear-time algorithm for the trust region subproblem by Hazan and Koren [Math. Program., 2016, 158(1-2): 363-381]. However, due to the non-convexity and non-compactness of the feasible region, such an extension is nontrivial. Our main contribution is to demonstrate that under some regular condition, the optimal solution is in a compact and convex set and lower and upper bounds of the optimal value can be computed in linear time. Using these properties, we develop a linear-time algorithm for the GTRS.

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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