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arXiv 2201.12767cs.LGcs.AIcs.CEmath.OC
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多目标混合变量问题的贝叶斯优化

Bayesian Optimization For Multi-Objective Mixed-Variable Problems

University of California, Berkeley(加州大学伯克利分校)

Haris Moazam Sheikh, Philip S. Marcus

摘要:

优化多个非优先目标的混合变量,昂贵的黑箱问题是重要的,在许多领域的工程和科学。这些问题的昂贵,嘈杂,黑箱性质使它们成为贝叶斯优化(BO)的理想候选者。混合变量和多目标的问题,但是,由于BO的基本平滑高斯过程代理模型的挑战。目前的多目标BO算法不能处理混合变量问题。我们提出了MixMOBO,第一个混合变量,多目标贝叶斯优化框架,这样的问题。使用MixMOBO,可以有效地找到多目标混合变量设计空间的最佳Pareto前沿,同时确保多样化的解决方案。该方法是足够灵活的,将不同的内核和采集功能,包括那些开发的混合变量或多目标问题的其他作者。我们还提出了HedgeMO,一个修改后的对冲策略,使用多目标问题的收购功能的投资组合。我们提出了一个新的采集功能,SMC。我们的研究结果表明,MixMOBO表现良好,对其他混合变量算法的合成问题。我们将MixMOBO应用于建筑材料的真实设计,并表明我们的最佳设计,这是实验制造和验证,具有归一化的应变能密度比现有结构大$10^4$倍。

英文摘要:

Optimizing multiple, non-preferential objectives for mixed-variable, expensive black-box problems is important in many areas of engineering and science. The expensive, noisy, black-box nature of these problems makes them ideal candidates for Bayesian optimization (BO). Mixed-variable and multi-objective problems, however, are a challenge due to BO's underlying smooth Gaussian process surrogate model. Current multi-objective BO algorithms cannot deal with mixed-variable problems. We present MixMOBO, the first mixed-variable, multi-objective Bayesian optimization framework for such problems. Using MixMOBO, optimal Pareto-fronts for multi-objective, mixed-variable design spaces can be found efficiently while ensuring diverse solutions. The method is sufficiently flexible to incorporate different kernels and acquisition functions, including those that were developed for mixed-variable or multi-objective problems by other authors. We also present HedgeMO, a modified Hedge strategy that uses a portfolio of acquisition functions for multi-objective problems. We present a new acquisition function, SMC. Our results show that MixMOBO performs well against other mixed-variable algorithms on synthetic problems. We apply MixMOBO to the real-world design of an architected material and show that our optimal design, which was experimentally fabricated and validated, has a normalized strain energy density $10^4$ times greater than existing structures.

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