public void CorrectNumberOfIndividualsGetReplaced()
{
int populationSize = 6;
double replacementPercentage = 0.3;
// Non competitive part of the population consists of 3 individuals.
// 30 % of them correspond to one individual.
int expectedNumberOfReplacedIndividuals = 1;
// Build up non-competitive population.
this._population = PopulationTest.CreatePopulation(populationSize, maxAge: 3, populationMutantRatio: replacementPercentage);
var genome1 = new Genome(1);
var genome2 = new Genome(2);
var genome3 = new Genome(3);
this._population.AddGenome(genome1, isCompetitive: false);
this._population.AddGenome(genome2, isCompetitive: false);
this._population.AddGenome(genome3, isCompetitive: false);
// Check the population and replace individuals.
var originalNonCompetitive = new List <Genome> {
genome1, genome2, genome3
};
Assert.True(originalNonCompetitive.SequenceEqual(this._population.GetNonCompetitiveMates(), Genome.GenomeComparer));
this._population.ReplaceIndividualsWithMutants(this._genomeBuilder);
// Check number of changed individuals.
var difference = originalNonCompetitive.Except(this._population.GetNonCompetitiveMates());
Assert.True(
expectedNumberOfReplacedIndividuals == difference.Count(),
$"There should be {expectedNumberOfReplacedIndividuals} items changed between {string.Join(";", originalNonCompetitive.Select(g => g.ToString()))} and {string.Join(",", this._population.GetNonCompetitiveMates().Select(g => g.ToString()))}.");
}
/// <summary>
/// Initializes a new instance of the <see cref="PopulationTest"/> class.
/// </summary>
public PopulationTest()
{
Randomizer.Reset();
Randomizer.Configure(42);
int populationSize = 6;
this._population = PopulationTest.CreatePopulation(populationSize, this._maxAge, this._populationMutantRatio);
}
public void AgeDistributionDoesNotChangeOnReplacement()
{
// Initialize a large population.
int populationSize = 50;
this._population = PopulationTest.CreatePopulation(populationSize, maxAge: 3, populationMutantRatio: this._populationMutantRatio);
// Insert individuals with different ages into non competitive population.
int numAgedZero = 6;
int numAgedOne = 4;
int numAgedTwo = 3;
int numAgedThree = 12;
for (int i = 0; i < numAgedZero; i++)
{
this._population.AddGenome(new Genome(), isCompetitive: false);
}
for (int i = 0; i < numAgedOne; i++)
{
this._population.AddGenome(new Genome(1), isCompetitive: false);
}
for (int i = 0; i < numAgedTwo; i++)
{
this._population.AddGenome(new Genome(2), isCompetitive: false);
}
for (int i = 0; i < numAgedThree; i++)
{
this._population.AddGenome(new Genome(3), isCompetitive: false);
}
// Check ages were inserted correctly.
var nonCompetitive = this._population.GetNonCompetitiveMates();
Assert.Equal(numAgedZero, nonCompetitive.Where(genome => genome.Age == 0).Count());
Assert.Equal(numAgedOne, nonCompetitive.Where(genome => genome.Age == 1).Count());
Assert.Equal(numAgedTwo, nonCompetitive.Where(genome => genome.Age == 2).Count());
Assert.Equal(numAgedThree, nonCompetitive.Where(genome => genome.Age == 3).Count());
// Replace some individuals with new random individuals.
this._population.ReplaceIndividualsWithMutants(this._genomeBuilder);
nonCompetitive = this._population.GetNonCompetitiveMates();
// Check age distribution is still the same.
Assert.Equal(
numAgedZero,
nonCompetitive.Where(genome => genome.Age == 0).Count());
Assert.Equal(
numAgedOne,
nonCompetitive.Where(genome => genome.Age == 1).Count());
Assert.Equal(
numAgedTwo,
nonCompetitive.Where(genome => genome.Age == 2).Count());
Assert.Equal(
numAgedThree,
nonCompetitive.Where(genome => genome.Age == 3).Count());
}
