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- W4320342826 abstract "Optimization problems involving mixed variables, i.e., variables of numerical and categorical nature, can be challenging to solve, especially in the presence of complex constraints. Moreover, when the objective function is the result of a complicated simulation or experiment, it may be expensive to evaluate. This paper proposes a novel surrogate-based global optimization algorithm to solve linearly constrained mixed-variable problems up to medium-large size (around 100 variables after encoding and 20 constraints) based on constructing a piecewise affine surrogate of the objective function over feasible samples. We introduce two types of exploration functions to efficiently search the feasible domain via mixed-integer linear programming solvers. We also provide a preference-based version of the algorithm, which can be used when only pairwise comparisons between samples can be acquired while the underlying objective function to minimize remains unquantified. The two algorithms are tested on mixed-variable benchmark problems with and without constraints. The results show that, within a small number of acquisitions, the proposed algorithms can often achieve better or comparable results than other existing methods." @default.
- W4320342826 created "2023-02-13" @default.
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- W4320342826 creator A5053340099 @default.
- W4320342826 date "2023-02-09" @default.
- W4320342826 modified "2023-10-05" @default.
- W4320342826 title "Global and Preference-based Optimization with Mixed Variables using Piecewise Affine Surrogates" @default.
- W4320342826 doi "https://doi.org/10.48550/arxiv.2302.04686" @default.
- W4320342826 hasPublicationYear "2023" @default.
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