Search Results for author: Weijie Zheng

Found 13 papers, 1 papers with code

Runtime Analysis of the SMS-EMOA for Many-Objective Optimization

no code implementations16 Dec 2023 Weijie Zheng, Benjamin Doerr

To this aim, we first propose a many-objective counterpart, the m-objective mOJZJ problem, of the bi-objective OJZJ benchmark, which is the first many-objective multimodal benchmark used in a mathematical runtime analysis.

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Theoretical Analyses of Evolutionary Algorithms on Time-Linkage OneMax with General Weights

no code implementations11 May 2023 Weijie Zheng, Xin Yao

We prove that except for some small and positive time-linkage effects (that is, for weights $0$ and $1$), randomized local search (RLS) and (1+1)EA cannot converge to the global optimum with a positive probability.

Evolutionary Algorithms

Runtime Analysis for the NSGA-II: Proving, Quantifying, and Explaining the Inefficiency For Many Objectives

no code implementations23 Nov 2022 Weijie Zheng, Benjamin Doerr

The NSGA-II is one of the most prominent algorithms to solve multi-objective optimization problems.

From Understanding Genetic Drift to a Smart-Restart Mechanism for Estimation-of-Distribution Algorithms

no code implementations18 Jun 2022 Weijie Zheng, Benjamin Doerr

Building on a recent quantitative analysis of how the population size leads to genetic drift, we design a smart-restart mechanism for EDAs.

Combinatorial Optimization

Approximation Guarantees for the Non-Dominated Sorting Genetic Algorithm II (NSGA-II)

no code implementations5 Mar 2022 Weijie Zheng, Benjamin Doerr

In this work, we study how well it approximates the Pareto front when the population size is smaller.

Mathematical Proofs

Mathematical Runtime Analysis for the Non-Dominated Sorting Genetic Algorithm II (NSGA-II)

1 code implementation16 Dec 2021 Weijie Zheng, Benjamin Doerr

The non-dominated sorting genetic algorithm II (NSGA-II) is the most intensively used multi-objective evolutionary algorithm (MOEA) in real-world applications.

Choosing the Right Algorithm With Hints From Complexity Theory

no code implementations14 Sep 2021 Shouda Wang, Weijie Zheng, Benjamin Doerr

Our finding that the unary unbiased black-box complexity is only $O(n^2)$ suggests the Metropolis algorithm as an interesting candidate and we prove that it solves the DLB problem in quadratic time.

Evolutionary Algorithms

When Non-Elitism Meets Time-Linkage Problems

no code implementations14 Apr 2021 Weijie Zheng, Qiaozhi Zhang, Huanhuan Chen, Xin Yao

However, only two elitist algorithms (1+1)EA and ($\mu$+1)EA are analyzed, and it is unknown whether the non-elitism mechanism could help to escape the local optima existed in OneMax$_{(0, 1^n)}$.

Evolutionary Algorithms

Theoretical Analyses of Multiobjective Evolutionary Algorithms on Multimodal Objectives

no code implementations14 Dec 2020 Weijie Zheng, Benjamin Doerr

As a first step towards a deeper understanding of how evolutionary algorithms solve multimodal multiobjective problems, we propose the OJZJ problem, a bi-objective problem composed of two objectives isomorphic to the classic jump function benchmark.

2k Evolutionary Algorithms +1

Analysis of Evolutionary Algorithms on Fitness Function with Time-linkage Property

no code implementations26 Apr 2020 Weijie Zheng, Huanhuan Chen, Xin Yao

In real-world applications, many optimization problems have the time-linkage property, that is, the objective function value relies on the current solution as well as the historical solutions.

Evolutionary Algorithms

From Understanding Genetic Drift to a Smart-Restart Parameter-less Compact Genetic Algorithm

no code implementations15 Apr 2020 Benjamin Doerr, Weijie Zheng

One of the key difficulties in using estimation-of-distribution algorithms is choosing the population size(s) appropriately: Too small values lead to genetic drift, which can cause enormous difficulties.

Sharp Bounds for Genetic Drift in Estimation of Distribution Algorithms

no code implementations31 Oct 2019 Benjamin Doerr, Weijie Zheng

This paper further proves that for PBIL with parameters $\mu$, $\lambda$, and $\rho$, in an expected number of $\Theta(\mu/\rho^2)$ iterations the sampling frequency of a neutral bit leaves the interval $[\Theta(\rho/\mu), 1-\Theta(\rho/\mu)]$ and then always the same value is sampled for this bit, that is, the frequency approaches the corresponding boundary value with maximum speed.

Evolutionary Algorithms

Working Principles of Binary Differential Evolution

no code implementations9 Dec 2018 Benjamin Doerr, Weijie Zheng

On the technical side, we observe that the strong stochastic dependencies in the random experiment describing a run of BDE prevent us from proving all desired results with the mathematical rigor that was successfully used in the analysis of other evolutionary algorithms.

Evolutionary Algorithms

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