Average Drift Analysis and Population Scalability

Research output: Contribution to journalArticlepeer-review

Authors

Colleges, School and Institutes

External organisations

  • Aberystwyth University

Abstract

This paper aims to study how the population size affects the computation time of evolutionary algorithms in a rigorous way. The computation time of evolutionary algorithms can be measured by either the number of generations (hitting time) or the number of fitness evaluations (running time) to find an optimal solution. Population scalability is the ratio of the expected hitting time between a benchmark algorithm and an algorithm using a larger population size. Average drift analysis is introduced to compare the expected hitting time of two algorithms and to estimate lower and upper bounds on the population scalability. Several intuitive beliefs are rigorously analysed. It is proven that (1) using a population sometimes increases rather than decreases the expected hitting time; (2) using a population cannot shorten the expected running time of
any elitist evolutionary algorithm on any unimodal function on the time-fitness landscape, however this statement is not true in terms of the distance-based fitness landscape; (3) using a population cannot always reduce the expected running time on deceptive functions, which depends on whether the benchmark
algorithm uses elitist selection or random selection.

Details

Original languageEnglish
Pages (from-to)426-439
Number of pages26
JournalIEEE Transactions on Evolutionary Computation
Volume21
Issue number3
Early online date29 Sep 2016
Publication statusPublished - Jun 2017