Search Results for author: Pietro S. Oliveto

Found 14 papers, 0 papers with code

(1+1) Genetic Programming With Functionally Complete Instruction Sets Can Evolve Boolean Conjunctions and Disjunctions with Arbitrarily Small Error

no code implementations13 Mar 2023 Benjamin Doerr, Andrei Lissovoi, Pietro S. Oliveto

Recently it has been proven that simple GP systems can efficiently evolve a conjunction of $n$ variables if they are equipped with the minimal required components.

On Steady-State Evolutionary Algorithms and Selective Pressure: Why Inverse Rank-Based Allocation of Reproductive Trials is Best

no code implementations18 Mar 2021 Dogan Corus, Andrei Lissovoi, Pietro S. Oliveto, Carsten Witt

On the other hand, we prove that selecting the worst individual as parent leads to efficient global optimisation with overwhelming probability for reasonable population sizes.

Evolutionary Algorithms

On the Impact of the Cutoff Time on the Performance of Algorithm Configurators

no code implementations12 Apr 2019 George T. Hall, Pietro S. Oliveto, Dirk Sudholt

We evaluate the performance of a simple random local search configurator (ParamRLS) for tuning the neighbourhood size $k$ of the RLS$_k$ algorithm.

Evolving Boolean Functions with Conjunctions and Disjunctions via Genetic Programming

no code implementations28 Mar 2019 Benjamin Doerr, Andrei Lissovoi, Pietro S. Oliveto

Recently it has been proved that simple GP systems can efficiently evolve the conjunction of $n$ variables if they are equipped with the minimal required components.

On Inversely Proportional Hypermutations with Mutation Potential

no code implementations27 Mar 2019 Dogan Corus, Pietro S. Oliveto, Donya Yazdani

In this paper we prove that considerable speed-ups in the exploitation phase may be achieved with dynamic inversely proportional mutation potentials (IPM) and argue that the potential should decrease inversely to the distance to the optimum rather than to the difference in fitness.

Evolutionary Algorithms

On the Benefits of Populations on the Exploitation Speed of Standard Steady-State Genetic Algorithms

no code implementations26 Mar 2019 Dogan Corus, Pietro S. Oliveto

It is generally accepted that populations are useful for the global exploration of multi-modal optimisation problems.

Computational Complexity Analysis of Genetic Programming

no code implementations11 Nov 2018 Andrei Lissovoi, Pietro S. Oliveto

Rather than identifying the optimum of a function as in more traditional evolutionary optimization, the aim of GP is to evolve computer programs with a given functionality.

Evolutionary Algorithms

Fast Artificial Immune Systems

no code implementations1 Jun 2018 Dogan Corus, Pietro S. Oliveto, Donya Yazdani

Various studies have shown that characteristic Artificial Immune System (AIS) operators such as hypermutations and ageing can be very efficient at escaping local optima of multimodal optimisation problems.

Evolutionary Algorithms

Artificial Immune Systems Can Find Arbitrarily Good Approximations for the NP-Hard Number Partitioning Problem

no code implementations1 Jun 2018 Dogan Corus, Pietro S. Oliveto, Donya Yazdani

In this paper we perform an analysis for the standard NP-hard \partition problem from combinatorial optimisation and rigorously show that hypermutations and ageing allow AISs to efficiently escape from local optima where standard EAs require exponential time.

Evolutionary Algorithms

When Hypermutations and Ageing Enable Artificial Immune Systems to Outperform Evolutionary Algorithms

no code implementations4 Apr 2018 Dogan Corus, Pietro S. Oliveto, Donya Yazdani

Unless the stop at first constructive mutation (FCM) mechanism is applied, we show that hypermutations require exponential expected runtime to optimise any function with a polynomial number of optima.

Evolutionary Algorithms

Simple Hyper-heuristics Control the Neighbourhood Size of Randomised Local Search Optimally for LeadingOnes

no code implementations23 Jan 2018 Andrei Lissovoi, Pietro S. Oliveto, John Alasdair Warwicker

We also prove that the performance of the HH improves as the number of low-level local search heuristics to choose from increases.

Theoretical Analysis of Stochastic Search Algorithms

no code implementations4 Sep 2017 Per Kristian Lehre, Pietro S. Oliveto

This quickly increasing basis of results allows, nowadays, the analysis of sophisticated algorithms such as population-based evolutionary algorithms, ant colony optimisation and artificial immune systems.

Evolutionary Algorithms

Standard Steady State Genetic Algorithms Can Hillclimb Faster than Mutation-only Evolutionary Algorithms

no code implementations4 Aug 2017 Dogan Corus, Pietro S. Oliveto

We present a lower bound for a greedy (2+1) GA that matches the upper bound for populations larger than 2, rigorously proving that 2 individuals cannot outperform larger population sizes under greedy selection and greedy crossover up to lower order terms.

Evolutionary Algorithms

Escaping Local Optima using Crossover with Emergent or Reinforced Diversity

no code implementations10 Aug 2016 Duc-Cuong Dang, Tobias Friedrich, Timo Kötzing, Martin S. Krejca, Per Kristian Lehre, Pietro S. Oliveto, Dirk Sudholt, Andrew M. Sutton

This proves a sizeable advantage of all variants of the ($\mu$+1) GA compared to (1+1) EA, which requires time $\Theta(n^k)$.

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