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• W3189847644 abstract "Abstract By remarkably reducing real fitness evaluations, surrogate-assisted evolutionary algorithms (SAEAs), especially hierarchical SAEAs, have been shown to be effective in solving computationally expensive optimization problems. The success of hierarchical SAEAs mainly profits from the potential benefit of their global surrogate models known as “blessing of uncertainty” and the high accuracy of local models. However, their performance leaves room for improvement on high-dimensional problems since now it is still challenging to build accurate enough local models due to the huge solution space. Directing against this issue, this study proposes a new hierarchical SAEA by training local surrogate models with the help of the random projection technique. Instead of executing training in the original high-dimensional solution space, the new algorithm first randomly projects training samples onto a set of low-dimensional subspaces, then trains a surrogate model in each subspace, and finally achieves evaluations of candidate solutions by averaging the resulting models. Experimental results on seven benchmark functions of 100 and 200 dimensions demonstrate that random projection can significantly improve the accuracy of local surrogate models and the new proposed hierarchical SAEA possesses an obvious edge over state-of-the-art SAEAs." @default.
• W3189847644 created "2021-08-16" @default.
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• W3189847644 date "2021-07-31" @default.
• W3189847644 modified "2023-10-16" @default.
• W3189847644 title "Enhancing hierarchical surrogate-assisted evolutionary algorithm for high-dimensional expensive optimization via random projection" @default.
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• W3189847644 doi "https://doi.org/10.1007/s40747-021-00484-w" @default.
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