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Timestamp:
06/26/12 15:29:45 (13 years ago)
Author:
gkronber
Message:

#1823 fixed a bug in the Pareto-best solution analyzers for symbolic data analysis. Fixed a minor bug in the calculation of classification thresholds, made a sneaky change in SymbolicExpressionTree

File:
1 edited

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  • trunk/sources/HeuristicLab.Problems.DataAnalysis/3.4/Implementation/Classification/ThresholdCalculators/AccuracyMaximizationThresholdCalculator.cs

    r7259 r8126  
    5454    public static void CalculateThresholds(IClassificationProblemData problemData, IEnumerable<double> estimatedValues, IEnumerable<double> targetClassValues, out double[] classValues, out double[] thresholds) {
    5555      int slices = 100;
     56      double minThresholdInc = 10e-5; // necessary to prevent infinite loop when maxEstimated - minEstimated is effectively zero (constant model)
    5657      List<double> estimatedValuesList = estimatedValues.ToList();
    5758      double maxEstimatedValue = estimatedValuesList.Max();
    5859      double minEstimatedValue = estimatedValuesList.Min();
    59       double thresholdIncrement = (maxEstimatedValue - minEstimatedValue) / slices;
     60      double thresholdIncrement = Math.Max((maxEstimatedValue - minEstimatedValue) / slices, minThresholdInc);
    6061      var estimatedAndTargetValuePairs =
    6162        estimatedValuesList.Zip(targetClassValues, (x, y) => new { EstimatedValue = x, TargetClassValue = y })
     
    7071
    7172      // incrementally calculate accuracy of all possible thresholds
    72       int[,] confusionMatrix = new int[nClasses, nClasses];
    73 
    7473      for (int i = 1; i < thresholds.Length; i++) {
    7574        double lowerThreshold = thresholds[i - 1];
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