Search Results for author: Zhigang Ren

Found 11 papers, 0 papers with code

Surrogate-assisted cooperative signal optimization for large-scale traffic networks

no code implementations3 Mar 2021 Yongsheng Liang, Zhigang Ren, Lin Wang, Hanqing Liu, Wenhao Du

The decomposition operation significantly narrows the search space of the whole traffic network, and the surrogate-assisted optimizer greatly lowers the computational burden by reducing the number of expensive traffic simulations.

Enhancing hierarchical surrogate-assisted evolutionary algorithm for high-dimensional expensive optimization via random projection

no code implementations1 Mar 2021 Xiaodong Ren, Daofu Guo, Zhigang Ren, Yongsheng Liang, An Chen

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.

Evolutionary Algorithms

A Surrogate-Assisted Variable Grouping Algorithm for General Large Scale Global Optimization Problems

no code implementations19 Jan 2021 An Chen, Zhigang Ren, Muyi Wang, Yongsheng Liang, Hanqing Liu, Wenhao Du

SVG first designs a general-separability-oriented detection criterion according to whether the optimum of a variable changes with other variables.

Problem Decomposition

An Eigenspace Divide-and-Conquer Approach for Large-Scale Optimization

no code implementations5 Apr 2020 Zhigang Ren, Yongsheng Liang, Muyi Wang, Yang Yang, An Chen

Different from existing DC-based algorithms that perform decomposition and optimization in the original decision space, EDC first establishes an eigenspace by conducting singular value decomposition on a set of high-quality solutions selected from recent generations.

Evolutionary Algorithms

Enhancing Cooperative Coevolution for Large Scale Optimization by Adaptively Constructing Surrogate Models

no code implementations1 Mar 2018 Bei Pang, Zhigang Ren, Yongsheng Liang, An Chen

As for the nonseparable sub-problems, the surrogate models are employed to evaluate the corresponding sub-solutions, and the original simulation model is only adopted to reevaluate some good sub-solutions selected by surrogate models.

Niching an Archive-based Gaussian Estimation of Distribution Algorithm via Adaptive Clustering

no code implementations1 Mar 2018 Yongsheng Liang, Zhigang Ren, Bei Pang, An Chen

As a model-based evolutionary algorithm, estimation of distribution algorithm (EDA) possesses unique characteristics and has been widely applied to global optimization.

Clustering

A Global Information Based Adaptive Threshold for Grouping Large Scale Global Optimization Problems

no code implementations1 Mar 2018 An Chen, Yi-Peng Zhang, Zhigang Ren, Yongsheng Liang, Bei Pang

On the one hand, by reducing the sensitivity of the indicator in DG to the roundoff error and the magnitude of contribution weight of subcomponent, we proposed a new indicator for two variables which is much more sensitive to their interaction.

Surrogate Model Assisted Cooperative Coevolution for Large Scale Optimization

no code implementations27 Feb 2018 Zhigang Ren, Bei Pang, Yongsheng Liang, An Chen, Yi-Peng Zhang

It has been shown that cooperative coevolution (CC) can effectively deal with large scale optimization problems (LSOPs) through a divide-and-conquer strategy.

Enhancing Gaussian Estimation of Distribution Algorithm by Exploiting Evolution Direction with Archive

no code implementations25 Feb 2018 Yongsheng Liang, Zhigang Ren, Xianghua Yao, Zuren Feng, An Chen

This study first systematically analyses the reasons for the deficiency of the traditional GEDA, then tries to enhance its performance by exploiting its evolution direction, and finally develops a new GEDA variant named EDA2.

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