public void TestTransitionToSimplifying()
{
var strategy = new RelativeComplexityRegulationStrategy(10, 10.0);
var eaStats = new EvolutionAlgorithmStatistics();
var popStats = new PopulationStatistics();
ComplexityRegulationMode mode;
// The strategy should initialise to, and remain in, Complexifying mode
// while mean population complexity is below the threshold.
for (int i = 0; i < 11; i++)
{
eaStats.Generation = i;
popStats.MeanComplexity = i;
popStats.MeanComplexityHistory.Enqueue(i);
mode = strategy.UpdateMode(eaStats, popStats);
Assert.Equal(ComplexityRegulationMode.Complexifying, mode);
}
// The strategy should switch to simplifying mode when mean complexity
// rises above the threshold.
eaStats.Generation = 11;
popStats.MeanComplexity = 10.01;
popStats.MeanComplexityHistory.Enqueue(10.01);
mode = strategy.UpdateMode(eaStats, popStats);
Assert.Equal(ComplexityRegulationMode.Simplifying, mode);
}
public void TestTransitionToComplexifying()
{
var strategy = new RelativeComplexityRegulationStrategy(10, 10.0);
var eaStats = new EvolutionAlgorithmStatistics();
var popStats = new PopulationStatistics();
ComplexityRegulationMode mode;
// Cause an immediate switch to into simplifying mode.
int generation = 0;
eaStats.Generation = generation++;
popStats.MeanComplexity = 11.0;
popStats.MeanComplexityHistory.Enqueue(11.0);
mode = strategy.UpdateMode(eaStats, popStats);
Assert.Equal(ComplexityRegulationMode.Simplifying, mode);
// Reset the buffer that the moving average is calculated from;
// This allows us to change the mean to below the threshold and for the
// moving average to start rising immediately; that would ordinarily cause
// an immediate switch back to complexifying mode, but that is prevented by
// {minSimplifcationGenerations} being set to 10.
popStats.MeanComplexityHistory.Clear();
for (int i = 0; i < 10; i++)
{
eaStats.Generation = generation++;
popStats.MeanComplexity = 2.0;
popStats.MeanComplexityHistory.Enqueue(2.0);
mode = strategy.UpdateMode(eaStats, popStats);
Assert.Equal(ComplexityRegulationMode.Simplifying, mode);
}
// Now that {minSimplifcationGenerations} have passed, the strategy should switch
// back to complexifying mode.
eaStats.Generation = generation++;
popStats.MeanComplexity = 2.0;
popStats.MeanComplexityHistory.Enqueue(2.0);
mode = strategy.UpdateMode(eaStats, popStats);
Assert.Equal(ComplexityRegulationMode.Complexifying, mode);
// The threshold should have been set relative to the popStats.MeanComplexity (to 12).
eaStats.Generation = generation++;
popStats.MeanComplexity = 11.9;
popStats.MeanComplexityHistory.Enqueue(11.9);
mode = strategy.UpdateMode(eaStats, popStats);
Assert.Equal(ComplexityRegulationMode.Complexifying, mode);
eaStats.Generation = generation++;
popStats.MeanComplexity = 12.01;
popStats.MeanComplexityHistory.Enqueue(12.01);
mode = strategy.UpdateMode(eaStats, popStats);
Assert.Equal(ComplexityRegulationMode.Simplifying, mode);
}
public void TestInitialisation()
{
var strategy = new RelativeComplexityRegulationStrategy(10, 10.0);
var eaStats = new EvolutionAlgorithmStatistics();
var popStats = new PopulationStatistics();
// The strategy should initialise to, and remain in, Complexifying mode.
for (int i = 0; i < 100; i++)
{
eaStats.Generation = i;
ComplexityRegulationMode mode = strategy.UpdateMode(eaStats, popStats);
Assert.Equal(ComplexityRegulationMode.Complexifying, mode);
}
}