arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2402.02552math.OCcs.AIcs.LG
收藏

Neur2BiLO:神经双层优化

Neur2BiLO: Neural Bilevel Optimization

University of Toronto(多伦多大学);TU Delft(代尔夫特理工大学);University of Amsterdam(阿姆斯特丹大学)

Justin Dumouchelle, Esther Julien, Jannis Kurtz, Elias B. Khalil

AI总结:

针对带整数变量的约束双层优化求解难、扩展性差、特定算法适用范围有限的问题,提出Neur2BiLO框架,将监督回归训练的价值函数神经网络近似嵌入易求解的混合整数规划,可快速为多类双层问题生成高质量解。

摘要:

双层优化处理嵌套问题:领导者率先做出决策以最小化其目标函数,同时需考虑跟随者的最优响应反应。带整数变量的约束双层问题因求解难度大而尤为臭名昭著。虽然已有精确求解器被提出用于混合整数线性双层优化,但它们往往随问题规模增大扩展性很差,且难以推广到非线性情形。另一方面,针对特定问题的算法(包括精确算法和启发式算法)适用范围有限。在需要常规求解同类双层问题实例的数据驱动场景下,我们提出的框架Neur2BiLO将通过监督回归训练的、对领导者或跟随者价值函数的神经网络近似,嵌入到一个易于求解的混合整数规划中。Neur2BiLO作为一种启发式方法,能针对4类具有线性与非线性目标、纯整数与混合整数变量的应用场景,极快地生成高质量解。

英文摘要:

Bilevel optimization deals with nested problems in which a leader takes the first decision to minimize their objective function while accounting for a follower's best-response reaction. Constrained bilevel problems with integer variables are particularly notorious for their hardness. While exact solvers have been proposed for mixed-integer linear bilevel optimization, they tend to scale poorly with problem size and are hard to generalize to the non-linear case. On the other hand, problem-specific algorithms (exact and heuristic) are limited in scope. Under a data-driven setting in which similar instances of a bilevel problem are solved routinely, our proposed framework, Neur2BiLO, embeds a neural network approximation of the leader's or follower's value function, trained via supervised regression, into an easy-to-solve mixed-integer program. Neur2BiLO serves as a heuristic that produces high-quality solutions extremely fast for four applications with linear and non-linear objectives and pure and mixed-integer variables.

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。

↑