Search Results for author: Phan Trung Hai Nguyen

Found 6 papers, 0 papers with code

On the Limitations of the Univariate Marginal Distribution Algorithm to Deception and Where Bivariate EDAs might help

no code implementations29 Jul 2019 Per Kristian Lehre, Phan Trung Hai Nguyen

More precisely, we show that the UMDA with a parent population size of $\mu=\Omega(\log n)$ has an expected runtime of $e^{\Omega(\mu)}$ on the DLB problem assuming any selective pressure $\frac{\mu}{\lambda} \geq \frac{14}{1000}$, as opposed to the expected runtime of $\mathcal{O}(n\lambda\log \lambda+n^3)$ for the non-elitist $(\mu,\lambda)~\text{EA}$ with $\mu/\lambda\leq 1/e$.

Evolutionary Algorithms

Runtime Analysis of the Univariate Marginal Distribution Algorithm under Low Selective Pressure and Prior Noise

no code implementations19 Apr 2019 Per Kristian Lehre, Phan Trung Hai Nguyen

We perform a rigorous runtime analysis for the Univariate Marginal Distribution Algorithm on the LeadingOnes function, a well-known benchmark function in the theory community of evolutionary computation with a high correlation between decision variables.

Level-Based Analysis of the Univariate Marginal Distribution Algorithm

no code implementations26 Jul 2018 Duc-Cuong Dang, Per Kristian Lehre, Phan Trung Hai Nguyen

The facility and generality of our arguments suggest that this is a promising approach to derive bounds on the expected optimisation time of EDAs.

Level-Based Analysis of the Population-Based Incremental Learning Algorithm

no code implementations5 Jun 2018 Per Kristian Lehre, Phan Trung Hai Nguyen

The Population-Based Incremental Learning (PBIL) algorithm uses a convex combination of the current model and the empirical model to construct the next model, which is then sampled to generate offspring.

Incremental Learning

Memetic Algorithms Beat Evolutionary Algorithms on the Class of Hurdle Problems

no code implementations17 Apr 2018 Phan Trung Hai Nguyen, Dirk Sudholt

Memetic algorithms are popular hybrid search heuristics that integrate local search into the search process of an evolutionary algorithm in order to combine the advantages of rapid exploitation and global optimisation.

Evolutionary Algorithms

Improved Runtime Bounds for the Univariate Marginal Distribution Algorithm via Anti-Concentration

no code implementations2 Feb 2018 Per Kristian Lehre, Phan Trung Hai Nguyen

Unlike traditional evolutionary algorithms which produce offspring via genetic operators, Estimation of Distribution Algorithms (EDAs) sample solutions from probabilistic models which are learned from selected individuals.

Evolutionary Algorithms

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