genetic programming - Island Model in ECJ -


in genetic programming (gp), when island model used, mean split population size between islands?

for example, if in parameters file have

pop.subpop.0.size = 4000

and have 4 islands, mean each island have population of size 1000? if put line of code in parameters file of each island? possible have different population size each island?

i'm using java , ecj package implement island models in gp.

no, in example have defined 1 island of 4000 individuals. number never automatically splited.

there 2 ways use islands model in ecj:

  • using interpopulationexchanger class:

one unique java process share variables. islands subpopulations of population object. therefore, need set sizes each subpopulation in parameter file. in example, have set island (subpopulation) 0 4000 individuals, should set other sizes. example, 10 islands of 4000 individuals each:

exch = ec.exchange.interpopulationexchange pop.subpops = 10 pop.subpop.0.size = 4000 pop.subpop.1.size = 4000 pop.subpop.2.size = 4000 ...etc pop.subpop.10.size = 4000
  • using islandexchanger class:

in case, every island executed in different java process, so, every islandid.params file (one per island/process) needs set 1 population:

exch = ec.exchange.interpopulationexchange pop.subpop.0.size = 4000

and number of islands set in server.params file:

exch.num-islands = 10

you can see rest of parameters , more information on page 223 of ecj documentation pdf: https://cs.gmu.edu/~eclab/projects/ecj/docs/manual/manual.pdf


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