Surrogate models for mixed discrete-continuous variables

Laura P. Swiler, Patricia D. Hough, Peter Qian, Xu Xu, Curtis Storlie, Herbert Lee

Research output: Chapter in Book/Report/Conference proceedingConference contribution

22 Scopus citations


Large-scale computational models have become common tools for analyzing complex man-made systems. However, when coupled with optimization or uncertainty quantification methods in order to conduct extensive model exploration and analysis, the computational expense quickly becomes intractable. Furthermore, these models may have both continuous and discrete parameters. One common approach to mitigating the computational expense is the use of response surface approximations. While well developed for models with continuous parameters, they are still new and largely untested for models with both continuous and discrete parameters. In this work, we describe and investigate the performance of three types of response surfaces developed for mixed-variable models: Adaptive Component Selection and Shrinkage Operator, Treed Gaussian Process, and Gaussian Process with Special Correlation Functions. We focus our efforts on test problems with a small number of parameters of interest, a characteristic of many physics-based engineering models. We present the results of our studies and offer some insights regarding the performance of each response surface approximation method.

Original languageEnglish (US)
Title of host publicationConstraint Programming and Decision Making
PublisherSpringer Verlag
Number of pages22
ISBN (Print)9783319042794
StatePublished - 2014

Publication series

NameStudies in Computational Intelligence
ISSN (Print)1860-949X

ASJC Scopus subject areas

  • Artificial Intelligence


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