Dispersion-Enhanced Sequential Batch Sampling for Adaptive Contour Estimation

Yiming Che, Juliane Mueller, Changqing Cheng

Research output: Contribution to journalArticlepeer-review

1 Scopus Citations

Abstract

In computer simulation and optimal design, sequential batch sampling offers an appealing way to iteratively stipulate optimal sampling points based upon existing selections and efficiently construct surrogate modeling. Nonetheless, the issue of near duplicates poses tremendous quandary for sequential learning. It refers to the situation that selected critical points cluster together in each sampling batch, which are individually but not collectively informative towards the optimal design. Near duplicates severely diminish the computational efficiency as they barely contribute extra information towards update of the surrogate. To address this issue, we impose a dispersion criterion on concurrent selection of sampling points, which essentially forces a sparse distribution of critical points in each batch, and demonstrate the effectiveness of this approach in adaptive contour estimation. Specifically, we adopt Gaussian process surrogate to emulate the simulator, acquire variance reduction of the critical region from new sampling points as a dispersion criterion, and combine it with the modified expected improvement (EI) function for critical batch selection. The critical region here is the proximity of the contour of interest. This proposed approach is vindicated in numerical examples of a two-dimensional four-branch function, a four-dimensional function with a disjoint contour of interest and a time-delay dynamic system.
Original languageAmerican English
Pages (from-to)131-144
Number of pages14
JournalQuality and Reliability Engineering International
Volume40
Issue number1
DOIs
StatePublished - 2024

NREL Publication Number

  • NREL/JA-2C00-84899

Keywords

  • batch sampling
  • contour estimation
  • Gaussian process surrogate
  • sequential optimal design

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