public void ClassificationAdaBoostModel_GetVariableImportance()
{
var parser = new CsvParser(() => new StringReader(Resources.AptitudeData));
var observations = parser.EnumerateRows(v => v != "Pass").ToF64Matrix();
var targets = parser.EnumerateRows("Pass").ToF64Vector();
var featureNameToIndex = new Dictionary <string, int> {
{ "AptitudeTestScore", 0 },
{ "PreviousExperience_month", 1 }
};
var learner = new ClassificationAdaBoostLearner(10, 1, 3);
var sut = learner.Learn(observations, targets);
var actual = sut.GetVariableImportance(featureNameToIndex);
var expected = new Dictionary <string, double> {
{ "PreviousExperience_month", 100.0 },
{ "AptitudeTestScore", 24.0268096428771 }
};
Assert.AreEqual(expected.Count, actual.Count);
var zip = expected.Zip(actual, (e, a) => new { Expected = e, Actual = a });
foreach (var item in zip)
{
Assert.AreEqual(item.Expected.Key, item.Actual.Key);
Assert.AreEqual(item.Expected.Value, item.Actual.Value, 0.000001);
}
}
public void ClassificationAdaBoostModel_GetVariableImportance()
{
var(observations, targets) = DataSetUtilities.LoadAptitudeDataSet();
var featureNameToIndex = new Dictionary <string, int> {
{ "AptitudeTestScore", 0 },
{ "PreviousExperience_month", 1 }
};
var learner = new ClassificationAdaBoostLearner(10, 1, 3);
var sut = learner.Learn(observations, targets);
var actual = sut.GetVariableImportance(featureNameToIndex);
var expected = new Dictionary <string, double> {
{ "PreviousExperience_month", 100.0 },
{ "AptitudeTestScore", 24.0268096428771 }
};
Assert.AreEqual(expected.Count, actual.Count);
var zip = expected.Zip(actual, (e, a) => new { Expected = e, Actual = a });
foreach (var item in zip)
{
Assert.AreEqual(item.Expected.Key, item.Actual.Key);
Assert.AreEqual(item.Expected.Value, item.Actual.Value, 0.000001);
}
}
public void ClassificationAdaBoostLearner_Learn_Glass()
{
var(observations, targets) = DataSetUtilities.LoadGlassDataSet();
var sut = new ClassificationAdaBoostLearner(10, 1, 5);
var model = sut.Learn(observations, targets);
var predictions = model.Predict(observations);
var evaluator = new TotalErrorClassificationMetric <double>();
var actual = evaluator.Error(targets, predictions);
Assert.AreEqual(0.0, actual);
}
public void ClassificationAdaBoostModel_Save()
{
var parser = new CsvParser(() => new StringReader(Resources.AptitudeData));
var observations = parser.EnumerateRows(v => v != "Pass").ToF64Matrix();
var targets = parser.EnumerateRows("Pass").ToF64Vector();
var learner = new ClassificationAdaBoostLearner(2);
var sut = learner.Learn(observations, targets);
var writer = new StringWriter();
sut.Save(() => writer);
Assert.AreEqual(ClassificationAdaBoostModelString, writer.ToString());
}
public void ClassificationAdaBoostModel_GetRawVariableImportance()
{
var(observations, targets) = DataSetUtilities.LoadAptitudeDataSet();
var learner = new ClassificationAdaBoostLearner(10, 1, 3);
var sut = learner.Learn(observations, targets);
var actual = sut.GetRawVariableImportance();
var expected = new double[] { 0.65083327864662022, 2.7087794356399844 };
Assert.AreEqual(expected.Length, actual.Length);
for (int i = 0; i < expected.Length; i++)
{
Assert.AreEqual(expected[i], actual[i], 0.000001);
}
}
public void ClassificationAdaBoostModel_Precit_Multiple()
{
var parser = new CsvParser(() => new StringReader(Resources.AptitudeData));
var observations = parser.EnumerateRows(v => v != "Pass").ToF64Matrix();
var targets = parser.EnumerateRows("Pass").ToF64Vector();
var rows = targets.Length;
var learner = new ClassificationAdaBoostLearner(10);
var sut = learner.Learn(observations, targets);
var predictions = sut.Predict(observations);
var evaluator = new TotalErrorClassificationMetric <double>();
var error = evaluator.Error(targets, predictions);
Assert.AreEqual(0.038461538461538464, error, 0.0000001);
}
public void ClassificationAdaBoostLearner_Learn_AptitudeData_SequenceContainNoItemIssue_Solved()
{
var(observations, targets) = DataSetUtilities.LoadAptitudeDataSet();
var indices = new int[] { 22, 6, 23, 12 };
var sut = new ClassificationAdaBoostLearner(10);
var model = sut.Learn(observations, targets, indices);
var predictions = model.Predict(observations);
var indexedPredictions = predictions.GetIndices(indices);
var indexedTargets = targets.GetIndices(indices);
var evaluator = new TotalErrorClassificationMetric <double>();
var actual = evaluator.Error(indexedTargets, indexedPredictions);
Assert.AreEqual(0.0, actual);
}
public void ClassificationAdaBoostModel_GetRawVariableImportance()
{
var parser = new CsvParser(() => new StringReader(Resources.AptitudeData));
var observations = parser.EnumerateRows(v => v != "Pass").ToF64Matrix();
var targets = parser.EnumerateRows("Pass").ToF64Vector();
var learner = new ClassificationAdaBoostLearner(10, 1, 3);
var sut = learner.Learn(observations, targets);
var actual = sut.GetRawVariableImportance();
var expected = new double[] { 0.65083327864662022, 2.7087794356399844 };
Assert.AreEqual(expected.Length, actual.Length);
for (int i = 0; i < expected.Length; i++)
{
Assert.AreEqual(expected[i], actual[i], 0.000001);
}
}
public void ClassificationAdaBoostModel_Predict_Single()
{
var(observations, targets) = DataSetUtilities.LoadAptitudeDataSet();
var learner = new ClassificationAdaBoostLearner(10);
var sut = learner.Learn(observations, targets);
var rows = targets.Length;
var predictions = new double[rows];
for (int i = 0; i < rows; i++)
{
predictions[i] = sut.Predict(observations.Row(i));
}
var evaluator = new TotalErrorClassificationMetric <double>();
var error = evaluator.Error(targets, predictions);
Assert.AreEqual(0.038461538461538464, error, 0.0000001);
}
public void ClassificationAdaBoostLearner_Learn_Glass_Indexed()
{
var(observations, targets) = DataSetUtilities.LoadGlassDataSet();
var sut = new ClassificationAdaBoostLearner(10, 1, 5);
var indices = Enumerable.Range(0, targets.Length).ToArray();
indices.Shuffle(new Random(42));
indices = indices.Take((int)(targets.Length * 0.7))
.ToArray();
var model = sut.Learn(observations, targets, indices);
var predictions = model.Predict(observations);
var indexedPredictions = predictions.GetIndices(indices);
var indexedTargets = targets.GetIndices(indices);
var evaluator = new TotalErrorClassificationMetric <double>();
var actual = evaluator.Error(indexedTargets, indexedPredictions);
Assert.AreEqual(0.0, actual);
}
