public void LDAIrisVariableImpactTest()
{
IClassificationProblemData problemData = LoadIrisProblem();
IClassificationSolution solution = LinearDiscriminantAnalysis.CreateLinearDiscriminantAnalysisSolution(problemData);
ClassificationSolutionVariableImpactsCalculator.CalculateImpacts(solution);
Dictionary <string, double> expectedImpacts = GetExpectedValuesForIrisLDAModel();
CheckDefaultAsserts(solution, expectedImpacts);
}
public void KNNIrisVariableImpactTest()
{
IClassificationProblemData problemData = LoadIrisProblem();
IClassificationSolution solution = NearestNeighbourClassification.CreateNearestNeighbourClassificationSolution(problemData, 3);
ClassificationSolutionVariableImpactsCalculator.CalculateImpacts(solution);
Dictionary <string, double> expectedImpacts = GetExpectedValuesForIrisKNNModel();
CheckDefaultAsserts(solution, expectedImpacts);
}
public void WrongDataSetVariableImpactClassificationTest()
{
IClassificationProblemData problemData = LoadIrisProblem();
IClassificationSolution solution = NearestNeighbourClassification.CreateNearestNeighbourClassificationSolution(problemData, 3);
ClassificationSolutionVariableImpactsCalculator.CalculateImpacts(solution);
Dictionary <string, double> expectedImpacts = GetExpectedValuesForIrisKNNModel();
solution.ProblemData = LoadMammographyProblem();
ClassificationSolutionVariableImpactsCalculator.CalculateImpacts(solution);
}
public static IEnumerable <Tuple <string, double> > CalculateImpacts(
IClassificationSolution solution,
ReplacementMethodEnum replacementMethod = ReplacementMethodEnum.Shuffle,
FactorReplacementMethodEnum factorReplacementMethod = FactorReplacementMethodEnum.Best,
DataPartitionEnum dataPartition = DataPartitionEnum.Training)
{
IEnumerable <int> rows = GetPartitionRows(dataPartition, solution.ProblemData);
IEnumerable <double> estimatedClassValues = solution.GetEstimatedClassValues(rows);
var model = (IClassificationModel)solution.Model.Clone(); //mkommend: clone of model is necessary, because the thresholds for IDiscriminantClassificationModels are updated
return(CalculateImpacts(model, solution.ProblemData, estimatedClassValues, rows, replacementMethod, factorReplacementMethod));
}
private void RemoveClassificationSolution(IClassificationSolution solution)
{
if (!Model.Models.Contains(solution.Model))
{
throw new ArgumentException();
}
Model.Remove(solution.Model);
trainingPartitions.Remove(solution.Model);
testPartitions.Remove(solution.Model);
trainingEvaluationCache.Clear();
testEvaluationCache.Clear();
evaluationCache.Clear();
}
private void AddClassificationSolution(IClassificationSolution solution)
{
if (Model.Models.Contains(solution.Model))
{
throw new ArgumentException();
}
Model.Add(solution.Model);
trainingPartitions[solution.Model] = solution.ProblemData.TrainingPartition;
testPartitions[solution.Model] = solution.ProblemData.TestPartition;
trainingEvaluationCache.Clear();
testEvaluationCache.Clear();
evaluationCache.Clear();
}
private void CheckDefaultAsserts(IClassificationSolution solution, Dictionary <string, double> expectedImpacts)
{
IClassificationProblemData problemData = solution.ProblemData;
IEnumerable <double> estimatedValues = solution.GetEstimatedClassValues(solution.ProblemData.TrainingIndices);
var solutionImpacts = ClassificationSolutionVariableImpactsCalculator.CalculateImpacts(solution);
var modelImpacts = ClassificationSolutionVariableImpactsCalculator.CalculateImpacts(solution.Model, problemData, estimatedValues, problemData.TrainingIndices);
//Both ways should return equal results
Assert.IsTrue(solutionImpacts.SequenceEqual(modelImpacts));
//Check if impacts are as expected
Assert.AreEqual(modelImpacts.Count(), expectedImpacts.Count);
Assert.IsTrue(modelImpacts.All(v => v.Item2.IsAlmost(expectedImpacts[v.Item1])));
}
public void PerformanceVariableImpactClassificationTest()
{
int rows = 1500;
int columns = 77;
IClassificationProblemData problemData = CreateDefaultProblem(rows, columns);
IClassificationSolution solution = NearestNeighbourClassification.CreateNearestNeighbourClassificationSolution(problemData, 3);
Stopwatch watch = new Stopwatch();
watch.Start();
var results = ClassificationSolutionVariableImpactsCalculator.CalculateImpacts(solution);
watch.Stop();
TestContext.WriteLine("");
TestContext.WriteLine("Calculated cells per millisecond: {0}.", rows * columns / watch.ElapsedMilliseconds);
}
protected override void Run(CancellationToken cancellationToken)
{
double rmsError, relClassificationError, outOfBagRmsError, outOfBagRelClassificationError;
if (SetSeedRandomly)
{
Seed = Random.RandomSeedGenerator.GetSeed();
}
var model = CreateRandomForestClassificationModel(Problem.ProblemData, NumberOfTrees, R, M, Seed, out rmsError, out relClassificationError, out outOfBagRmsError, out outOfBagRelClassificationError);
Results.Add(new Result("Root mean square error", "The root of the mean of squared errors of the random forest regression solution on the training set.", new DoubleValue(rmsError)));
Results.Add(new Result("Relative classification error", "Relative classification error of the random forest regression solution on the training set.", new PercentValue(relClassificationError)));
Results.Add(new Result("Root mean square error (out-of-bag)", "The out-of-bag root of the mean of squared errors of the random forest regression solution.", new DoubleValue(outOfBagRmsError)));
Results.Add(new Result("Relative classification error (out-of-bag)", "The out-of-bag relative classification error of the random forest regression solution.", new PercentValue(outOfBagRelClassificationError)));
IClassificationSolution solution = null;
if (ModelCreation == ModelCreation.Model)
{
solution = model.CreateClassificationSolution(Problem.ProblemData);
}
else if (ModelCreation == ModelCreation.SurrogateModel)
{
var problemData = Problem.ProblemData;
var surrogateModel = new RandomForestModelSurrogate(model, problemData.TargetVariable, problemData, Seed, NumberOfTrees, R, M, problemData.ClassValues.ToArray());
solution = surrogateModel.CreateClassificationSolution(problemData);
}
if (solution != null)
{
Results.Add(new Result(RandomForestClassificationModelResultName, "The random forest classification solution.", solution));
}
}
private void RemoveClassificationSolution(IClassificationSolution solution) {
if (!Model.Models.Contains(solution.Model)) throw new ArgumentException();
Model.Remove(solution.Model);
trainingPartitions.Remove(solution.Model);
testPartitions.Remove(solution.Model);
trainingEvaluationCache.Clear();
testEvaluationCache.Clear();
evaluationCache.Clear();
}
private void AddClassificationSolution(IClassificationSolution solution) {
if (Model.Models.Contains(solution.Model)) throw new ArgumentException();
Model.Add(solution.Model);
trainingPartitions[solution.Model] = solution.ProblemData.TrainingPartition;
testPartitions[solution.Model] = solution.ProblemData.TestPartition;
trainingEvaluationCache.Clear();
testEvaluationCache.Clear();
evaluationCache.Clear();
}
//mkommend: annoying name clash with static method, open to better naming suggestions
public IEnumerable <Tuple <string, double> > Calculate(IClassificationSolution solution)
{
return(CalculateImpacts(solution, ReplacementMethod, FactorReplacementMethod, DataPartition));
}