/// <summary>
/// Writes class classification statistics.
/// </summary>
/// <param name="writer">A stream to write the report to.</param>
/// <param name="summary">Classification results for the class.</param>
/// <param name="classNameLength">The number of characters in the class name column.</param>
private static void WriteClassStatistics(TextWriter writer, ClassSummary <T> summary, int classNameLength)
{
writer.Write(string.Format(CultureInfo.InvariantCulture, "{{0,-{0}}},", classNameLength), summary.Label);
WriteShortStatistics(writer, summary.Statistics.All);
WriteLongStatistics(writer, summary.Statistics.WithTruth);
writer.WriteLine();
}
/// <summary>
/// Initializes a new instance of the <see cref="ClassificationReport{T}"/> class.
/// </summary>
/// <param name="results">The classification results.</param>
public ClassificationReport(IEnumerable <ClassificationResult <T> > results)
{
if (results == null)
{
throw new ArgumentNullException(nameof(results));
}
Dictionary <T, ClassSummary <T> > summaries = new Dictionary <T, ClassSummary <T> >();
foreach (ClassificationResult <T> result in results)
{
this.results.Add(result);
T expected = result.Expected;
if (!summaries.TryGetValue(expected, out ClassSummary <T> summary))
{
summaries[expected] = summary = new ClassSummary <T>(expected);
this.classes.Add(summary);
}
summary.Add(result);
this.AllClasses.Add(result);
this.ConfusionMatrix.Add(result.Predicted, expected);
}
this.results.TrimExcess();
this.classes.TrimExcess();
}
/// <summary>
/// Writes class errors.
/// </summary>
/// <param name="writer">A stream to write the report to.</param>
/// <param name="summary">Classification results for the class.</param>
private static void WriteClassificationErrors(TextWriter writer, ClassSummary <T> summary)
{
int acceptedErrors = summary.Errors.Count();
if (acceptedErrors > 0)
{
writer.WriteLine(string.Format(CultureInfo.InvariantCulture, "{0} ({1})", summary.Label, acceptedErrors));
writer.WriteLine();
ClassificationResult <T> .Write(writer, summary.Errors);
writer.WriteLine("-----------------------------------------------------------------------------");
writer.WriteLine();
}
}
/// <summary>
/// Writes class reject curve.
/// </summary>
/// <param name="writer">A stream to write the report to.</param>
/// <param name="summary">Classification results for the class.</param>
private static void WriteClassRejectCurve(TextWriter writer, ClassSummary <T> summary)
{
float[] errorRates = { 0.001f, 0.005f, 0.01f, 0.02f, 0.03f, 0.04f, 0.05f, 0.06f, 0.07f, 0.08f, 0.09f, 0.10f, 0.11f };
writer.WriteLine(summary.Label);
writer.WriteLine();
writer.WriteLine(
"{0,-10}{1,-10}{2,-10}{3,-10}",
"Target",
"Error",
"Accept",
"Threshold");
RejectCurveTarget[] targets = summary.Statistics.RejectCurveTruth.GetTargets(errorRates);
foreach (RejectCurveTarget target in targets)
{
if (target.Point.HasValue)
{
writer.WriteLine(
"{0,-10:P2}{1,-10:P2}{2,-10:P2}{3,-10:N0}",
target.Target,
target.Point.Value.ErrorRate,
target.Point.Value.AcceptRate,
target.Point.Value.Threshold);
}
else
{
writer.WriteLine(
"{0,-10:P2}{1,-10}{1,-10}{1,-10}",
target.Target,
"N/A");
}
}
writer.WriteLine();
// write area
float average = summary.Statistics.RejectCurveTruth.GetArea(0.0f, errorRates.Last(), 100);
writer.WriteLine(
"Area: {0:P2}",
average);
writer.WriteLine("-----------------------------------------------------------------------------");
writer.WriteLine();
}
/// <summary>
/// Writes all reject curves.
/// </summary>
/// <param name="writer">A stream to write the report to.</param>
/// <param name="all">Classification results for all classes.</param>
/// <param name="classes">Classification results for each class.</param>
private static void WriteRejectCurves(TextWriter writer, ClassSummary <T> all, IList <ClassSummary <T> > classes)
{
float[] errorRates = { 0.001f, 0.005f, 0.01f, 0.02f, 0.03f, 0.04f, 0.05f, 0.06f, 0.07f, 0.08f, 0.09f, 0.10f, 0.11f };
List <ClassSummary <T> > combined = new List <ClassSummary <T> >()
{
all
};
combined.AddRange(classes);
string separator = new string('-', 10 + (30 * combined.Count));
// write class names
writer.Write("{0,-10}", string.Empty);
foreach (ClassSummary <T> cls in combined)
{
writer.Write("{0,-30}", cls.Label);
}
writer.WriteLine();
writer.WriteLine(separator);
// write header
writer.Write("{0,-10}", "Target");
for (int i = 0, ii = combined.Count; i < ii; i++)
{
writer.Write("{0,-10}{1,-10}{2,-10}", "Error", "Accept", "Thresh");
}
writer.WriteLine();
// write targets
foreach (float errorRate in errorRates)
{
writer.Write("{0,-10:P2}", errorRate);
foreach (ClassSummary <T> cls in combined)
{
RejectCurveTarget target = cls.Statistics.RejectCurveTruth.GetTarget(errorRate);
if (target.Point.HasValue)
{
writer.Write(
"{0,-10:P2}{1,-10:P2}{2,-10:N0}",
target.Point.Value.ErrorRate,
target.Point.Value.AcceptRate,
target.Point.Value.Threshold);
}
else
{
writer.Write(
"{0,-10}{0,-10}{0,-10}",
"N/A");
}
}
writer.WriteLine();
}
writer.WriteLine(separator);
// write area
writer.Write("{0,-10}", "Area:");
foreach (ClassSummary <T> cls in combined)
{
float average = cls.Statistics.RejectCurveTruth.GetArea(0.0f, errorRates.Last(), 100);
writer.Write("{0,-30:P2}", average);
}
writer.WriteLine();
}