arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1903.11366math.OC
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凸黑箱图全局Optimization的一种求解方法

A Method for Convex Black-Box Integer Global Optimization

Jeffrey Larson, Sven Leyffer, Prashant Palkar, Stefan M. Wild

摘要:

研究了整数格的非空有限子集上的凸函数在非整数点上不可求值时的极小化问题。我们提出了一个新的低估,不需要访问(子)梯度的目标,而是使用割线线性函数插值的目标函数在以前评估的点。这些线性映射被证明低估了在域的断开部分的目标。因此,这些条件割的并集提供了目标的非凸低估器。我们提出了一种算法,更新低估和评估的目标函数之间交替。我们证明了该算法收敛到可行集上的目标函数的全局极小值。我们提出了两种方法来表示低估,并比较其计算效率。我们还比较了我们的算法实现与现有的方法最小化的整数格的一个子集上的函数。我们讨论了这个问题类的难度,并提供见解,为什么最优性的计算证明是具有挑战性的,即使是中等规模的问题。

英文摘要:

We study the problem of minimizing a convex function on a nonempty, finite subset of the integer lattice when the function cannot be evaluated at noninteger points. We propose a new underestimator that does not require access to (sub)gradients of the objective but, rather, uses secant linear functions that interpolate the objective function at previously evaluated points. These linear mappings are shown to underestimate the objective in disconnected portions of the domain. Therefore, the union of these conditional cuts provides a nonconvex underestimator of the objective. We propose an algorithm that alternates between updating the underestimator and evaluating the objective function. We prove that the algorithm converges to a global minimum of the objective function on the feasible set. We present two approaches for representing the underestimator and compare their computational effectiveness. We also compare implementations of our algorithm with existing methods for minimizing functions on a subset of the integer lattice. We discuss the difficulty of this problem class and provide insights into why a computational proof of optimality is challenging even for moderate problem sizes.

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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