rgp (version 0.4-1)

makeAgeFitnessComplexityParetoGpSearchHeuristic: Age Fitness Complexity Pareto GP Search Heuristic for RGP

Description

The search-heuristic, i.e. the concrete GP search algorithm, is a modular component of RGP. makeAgeFitnessComplexityParetoGpSearchHeuristic creates a RGP search-heuristic that implements a generational evolutionary multi objective optimization algorithm (EMOA) that selects on three criteria: Individual age, individual fitness, and individual complexity.

Usage

makeAgeFitnessComplexityParetoGpSearchHeuristic(lambda = 50, crossoverProbability = 0.5, enableComplexityCriterion = TRUE, enableAgeCriterion = FALSE, ndsParentSelectionProbability = 0, ndsSelectionFunction = nds_cd_selection, complexityMeasure = function(ind, fitness) fastFuncVisitationLength(ind), ageMergeFunction = max, newIndividualsPerGeneration = if (enableAgeCriterion) 50 else 0, newIndividualsMaxDepth = 8, newIndividualFactory = makePopulation)

Arguments

lambda
The number of children to create in each generation (50 by default).
crossoverProbability
The crossover probability for search-heuristics that support this setting (i.e. TinyGP). Defaults to 0.5.
enableComplexityCriterion
Whether to enable the complexity criterion in multi-criterial search heuristics.
enableAgeCriterion
Whether to enable the age criterion in multi-criterial search heuristics.
ndsParentSelectionProbability
The probability to use non-dominated sorting to select parents for each generation. When set to 0.0, parents are selected by uniform random sampling without replacement every time. Defaults to 1.0.
ndsSelectionFunction
The function to use for non-dominated sorting in Pareto GP selection. Defaults to nds_cd_selection.
complexityMeasure
The complexity measure, a function of signature function(ind, fitness) returning a single numeric value.
ageMergeFunction
The function used for merging ages of crossover children, defaults to max.
newIndividualsPerGeneration
The number of new individuals per generation to insert into the population. Defaults to 50 if enableAgeCriterion == TRUE else to 0.
newIndividualsMaxDepth
The maximum depth of new individuals inserted into the population.
newIndividualFactory
The factory function for creating new individuals. Defaults to makePopulation.

Value

An RGP search heuristic.