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arXiv 1603.03366math.OC
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求解置信域子问题及其变形的二阶锥方法

A Second-Order Cone Based Approach for Solving the Trust Region Subproblem and Its Variants

Nam Ho-Nguyen, Fatma Kilinc-Karzan

摘要:

研究了单位球上带圆锥约束的非凸二次函数极小化的信赖域子问题。尽管有一个非凸的目标,它是已知的,经典的TRS和它的一些变种是多项式时间可解的。在本文中,我们遵循二阶锥(SOC)为基础的方法来获得一个精确的凸重新TRS锥约束下的结构条件。我们的结构条件是立即满足时,没有额外的圆锥约束,它推广了文献中研究的几个这样的条件。因此,我们的研究突出了经典的非凸TRS和光滑凸二次最小化,这使得廉价的迭代法,如Nesterov的加速梯度下降,TRS的应用程序之间的明确连接。此外,在稍强的条件下,我们给出了一个低复杂性的非凸二次函数的epigram的凸包的定义域的限制,没有任何额外的变量。我们还探讨了列入额外的空心约束域的TRS,和凸化的相关epigraph。

英文摘要:

We study the trust-region subproblem (TRS) of minimizing a nonconvex quadratic function over the unit ball with additional conic constraints. Despite having a nonconvex objective, it is known that the classical TRS and a number of its variants are polynomial-time solvable. In this paper, we follow a second-order cone (SOC) based approach to derive an exact convex reformulation of the TRS under a structural condition on the conic constraint. Our structural condition is immediately satisfied when there is no additional conic constraints, and it generalizes several such conditions studied in the literature. As a result, our study highlights an explicit connection between the classical nonconvex TRS and smooth convex quadratic minimization, which allows for the application of cheap iterative methods such as Nesterov's accelerated gradient descent, to the TRS. Furthermore, under slightly stronger conditions, we give a low-complexity characterization of the convex hull of the epigraph of the nonconvex quadratic function intersected with the constraints defining the domain without any additional variables. We also explore the inclusion of additional hollow constraints to the domain of the TRS, and convexification of the associated epigraph.

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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