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Systematic cost analysis of gradient- and anisotropy-enhanced Bayesian design optimization

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Structural and Multidisciplinary Optimization Aims and scope Submit manuscript

Abstract

The prediction of global optima for non-convex and expensive objective functions is a pervasive challenge across many engineering applications and research areas. Bayesian optimization (BO) is a powerful method for solving optimization problems of this type, as it replaces the expensive search space of the objective function with a less expensive Gaussian process or alternative surrogate model. However, selecting the form and hyperparameters of this surrogate model to optimally represent the design space and maximize the convergence rate is a difficult and non-intuitive challenge. In this work, we conduct a systematic breakdown of the computational costs of the BO framework to reveal how these choices of surrogate formulation and hyperparameters influence overall convergence and prediction quality. We consider two qualitatively different modifications of BO to evaluate for improved performance, specifically gradient-enhanced BO (GEBO) and anisotropy-enhanced automatic relevance determination (ARD). GEBO utilizes available gradient information about the objective function to improve the quality of the surrogate representation and selection of the next evaluation point, but with the trade-off of additional expense. In contrast, ARD utilizes an anisotropic Gaussian process surrogate and relevancy criteria to reduce the search space of the surrogate model and improve convergence by solving a smaller problem. After a systematic analysis of the hyperparameters for both strategies, the methods were benchmarked by solving a fluid mechanics airfoil shape optimization problem and a structural mechanics origami actuator problem. These optimization problems involve 38 to 84 design variables. GEBO exhibited around 3\(\times\) speedup for all benchmark problems compared to BO without modification, while ARD-enriched BO exhibited a 1.55× speedup on select problems. Manifold analysis of the design space revealed that ARD performed best on problems with a contiguous reduced dimension. Collectively, these results highlight the trade-offs and cost distribution difference between GE and ARD modification for BO and provide guidelines for implementation in new problems.

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Correspondence to Kumar Vemaganti.

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The authors have no conflict of interests to declare.

Replication of results

The MATLAB code for solving origami problems using gradient-based methods can be downloaded from MathWorks. The MATLAB code for the integration of Bayesian optimization to solve origami problems and the airfoil problem can be made available to interested parties upon request to the authors.

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Responsible Editor: Lei Wang

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Shende, S., Gillman, A., Buskohl, P. et al. Systematic cost analysis of gradient- and anisotropy-enhanced Bayesian design optimization. Struct Multidisc Optim 65, 235 (2022). https://doi.org/10.1007/s00158-022-03324-8

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  • DOI: https://doi.org/10.1007/s00158-022-03324-8

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