private static GeneticAlgorithmResult AverageResults(List <GeneticAlgorithmResult> results)
{
GeneticAlgorithmResult averageResult = new GeneticAlgorithmResult();
averageResult.stats = new List <GenerationStats>();
List <List <GenerationStats> > unitedStats = results.Select(x => x.stats).ToList();
for (int i = 0; i < results[0].stats.Count; i++)
{
GenerationStats stat = new GenerationStats();
stat.compilationErrors = unitedStats.Select(x => x[i].compilationErrors).Average();
stat.executedEvaluations = unitedStats.Select(x => x[i].executedEvaluations).Average();
stat.executionExceptions = unitedStats.Select(x => x[i].executionExceptions).Average();
stat.failedErrorChecks = unitedStats.Select(x => x[i].failedErrorChecks).Average();
stat.failedErrorCorrections = unitedStats.Select(x => x[i].failedErrorCorrections).Average();
stat.generationErrors = unitedStats.Select(x => x[i].generationErrors).Average();
stat.passedErrorChecks = unitedStats.Select(x => x[i].passedErrorChecks).Average();
stat.successfulErrorCorrections = unitedStats.Select(x => x[i].successfulErrorCorrections).Average();
stat.fitnessValues = new List <double>();
for (int j = 0; j < unitedStats[0][0].fitnessValues.Count; j++)
{
stat.fitnessValues.Add(unitedStats.Select(x => x[i].fitnessValues[j]).Average());
}
averageResult.stats.Add(stat);
}
return(averageResult);
}
internal string Generate(Chromosome genome, GenerationStats currentGenerationStats)
{
_genome = genome;
_currentGenerationStats = currentGenerationStats;
string code = "";
bool compileAgain = true;
bool correctionApplied = false;
while (compileAgain)
{
try
{
codonPosition = -1;
GrammaticalObject go = (GrammaticalObject)Activator.CreateInstance(StartingGO.GetType());
go.instance = this;
go.Initialize(go.GetInitialProductionRules());
code = ConvertToCode(StartingProductionRule, go);
break;
}
catch (ErrorCheck.ErrorCheckFailException e)
{
compileAgain = false;
List <GrammaticalObject> stackTrace = e.exceptionGO.GetStackTrace();
_currentGenerationStats.failedErrorChecks++;
for (int stackTracePosition = 0; stackTracePosition < stackTrace.Count && !compileAgain; stackTracePosition++)
{
int initialPosition = stackTrace[stackTracePosition].FirstUsedIndex;
int finalPosition = stackTrace[stackTracePosition].LastUsedIndex;
if (CanCorrectChromosome(_genome, initialPosition, finalPosition))
{
compileAgain = true;
correctionApplied = true;
CorrectChromosome(_genome, initialPosition, finalPosition);
}
}
if (!compileAgain)
{
_currentGenerationStats.failedErrorCorrections++;
throw new ErrorCorrectionFailedException();
}
}
}
if (correctionApplied)
{
_currentGenerationStats.successfulErrorCorrections++;
}
return(code);
}
public GenerationStats GetClone()
{
GenerationStats stats = new GenerationStats();
stats.bestChromosome = bestChromosome.GetClone();
stats.compilationErrors = compilationErrors;
stats.executedEvaluations = executedEvaluations;
stats.executionExceptions = executionExceptions;
stats.failedErrorChecks = failedErrorChecks;
stats.failedErrorCorrections = failedErrorCorrections;
stats.fitnessValues = fitnessValues.ToList();
stats.generationErrors = generationErrors;
stats.passedErrorChecks = passedErrorChecks;
stats.successfulErrorCorrections = successfulErrorCorrections;
return(stats);
}
private Tuple <double, bool> Evaluate(Chromosome chromosome, bool saveBackupCodons, GrammaticalEvolution ge)
{
GrammaticalEvolution newGE = ge.GetClone();
string code = null;
object result = null;
Exception generationException = null;
CompilerErrorCollection compilationErrors = null;
Exception executionException = null;
GenerationStats s = new GenerationStats();
try
{
code = newGE.Generate(chromosome, s);
}
catch (GrammaticalEvolution.ErrorCorrectionFailedException e)
{
generationException = e;
}
catch (GrammaticalEvolution.EndOfCodonQueueException e)
{
generationException = e;
}
if (generationException == null)
{
try
{
result = Executor.Execute(Parameters, code);
}
catch (Executor.CompilationErrorException e)
{
compilationErrors = e.Errors;
}
catch (Executor.ExecutionExceptionException e)
{
executionException = e.InnerException;
}
}
if (generationException == null && compilationErrors == null && executionException == null && saveBackupCodons)
{
chromosome.BackupCodons = chromosome.ToList();
}
return(new Tuple <double, bool>(Calculator(result, generationException, compilationErrors, executionException), s.failedErrorCorrections > 0));
}
public Generation() : base()
{
Stats = new GenerationStats();
}