public void MutateMayChangeEveryParameter()
{
// Create genome builder with a mutation rate of 1.
var configuration = new AlgorithmTunerConfiguration.AlgorithmTunerConfigurationBuilder()
.SetMutationRate(1)
.Build(maximumNumberParallelEvaluations: 1);
var genomeBuilder = new GenomeBuilder(GenomeBuilderTest.BuildParameterTree(), configuration);
// Create genome.
var genome = GenomeBuilderTest.BuildFittingGenome();
// Prepare structure to store which values have been mutated.
string[] identifiers =
{
GenomeBuilderTest.DecisionParameter,
GenomeBuilderTest.SmallValueParameter,
GenomeBuilderTest.DiscreteParameter,
GenomeBuilderTest.ContinuousParameter,
};
Dictionary <string, bool> hasBeenMutated = identifiers.ToDictionary(
identifier => identifier,
identifier => false);
Dictionary <string, IAllele> originalValues = identifiers.ToDictionary(
identifier => identifier,
identifier => genome.GetGeneValue(identifier));
// Do a lot of mutations.
for (int i = 0; i < GenomeBuilderTest.loopCountForRandomTests; i++)
{
genomeBuilder.Mutate(genome);
// After each one, check which genes have changed...
foreach (string identifier in identifiers)
{
bool valueChanged = !object.Equals(originalValues[identifier], genome.GetGeneValue(identifier));
if (valueChanged)
{
// ...and store them.
hasBeenMutated[identifier] = true;
}
}
}
// Finally check that everything has been changed at least once.
Assert.True(
hasBeenMutated.All(keyValuePair => keyValuePair.Value),
$"Genes {TestUtils.PrintList(hasBeenMutated.Where(keyValuePair => !keyValuePair.Value).Select(keyValuePair => keyValuePair.Key))} have not been mutated.");
}
public void MutateChangesGivenGenomeIfMutationRateIs1()
{
// Create genome builder with a mutation rate of 1.
var configuration =
new AlgorithmTunerConfiguration.AlgorithmTunerConfigurationBuilder()
.SetMutationRate(1)
.Build(maximumNumberParallelEvaluations: 1);
var genomeBuilder = new GenomeBuilder(GenomeBuilderTest.BuildParameterTree(), configuration);
// Build a fitting genome and store original description.
var genome = GenomeBuilderTest.BuildFittingGenome();
string originalDescription = genome.ToString();
// Call mutate and check genome changed.
genomeBuilder.Mutate(genome);
Assert.NotEqual(
originalDescription,
genome.ToString());
}
public void MutateRespectsMutationRate()
{
// Create genome builder with a mutation rate of 0.35.
double mutationRate = 0.35;
var configuration =
new AlgorithmTunerConfiguration.AlgorithmTunerConfigurationBuilder()
.SetMutationRate(mutationRate)
.Build(maximumNumberParallelEvaluations: 1);
var genomeBuilder = new GenomeBuilder(GenomeBuilderTest.BuildParameterTree(), configuration);
// Create genome.
var genome = GenomeBuilderTest.BuildFittingGenome();
// For a lot of iterations:
IAllele oldGeneValue = genome.GetGeneValue(GenomeBuilderTest.ContinuousParameter);
int changeCount = 0;
int numberLoops = 1000;
for (int i = 0; i < numberLoops; i++)
{
// Mutate the genome ...
genomeBuilder.Mutate(genome);
// ... compare the continuous parameter gene...
IAllele newGeneValue = genome.GetGeneValue(GenomeBuilderTest.ContinuousParameter);
if (!object.Equals(newGeneValue, oldGeneValue))
{
changeCount++;
}
// ... and count the number of times it changes.
oldGeneValue = newGeneValue;
}
// Finally compare the number of mutations with the expected number.
double expectedNumberMutations = mutationRate * numberLoops;
Assert.True(
Math.Abs(expectedNumberMutations - changeCount) <= 0.1 * expectedNumberMutations,
"Number of mutations was not as expected.");
}