public static double Accuracy <TSolution>(this CrossValidationResult <TSolution> result, IEqualityComparer <TSolution> comparer = null)
{
if (result == null)
{
throw new ArgumentNullException(nameof(result));
}
var correct = 0;
var overall = 0;
var solutionComparer = comparer ?? EqualityComparer <TSolution> .Default;
foreach (var fold in result.Folds)
{
overall += fold.GroundTruth.Count;
correct += fold.GroundTruth.Where((t, i) => solutionComparer.Equals(t, fold.Predicted[i])).Count();
}
return(overall != 0 ? (double)correct / overall : 0);
}
public static ConfusionMatrix <TSolution> ConfusionMatrix <TSolution>(this CrossValidationResult <TSolution> result, IComparer <TSolution> comparer = null)
{
if (result == null)
{
throw new ArgumentNullException(nameof(result));
}
var solutionComparer = comparer ?? Comparer <TSolution> .Default;
var matrix = new SortedDictionary <TSolution, SortedDictionary <TSolution, int> >(solutionComparer);
foreach (var fold in result.Folds)
{
for (var i = 0; i < fold.GroundTruth.Count; i++)
{
var truth = fold.GroundTruth[i];
var prediction = fold.Predicted[i];
if (!matrix.TryGetValue(truth, out var truthMap))
{
truthMap = new SortedDictionary <TSolution, int>(solutionComparer)
{
[truth] = 0
};
matrix[truth] = truthMap;
}
truthMap[prediction] = !truthMap.TryGetValue(prediction, out var count) ? 1 : count + 1;
if (matrix.TryGetValue(prediction, out _))
{
continue;
}
matrix[prediction] = new SortedDictionary <TSolution, int>(solutionComparer)
{
[prediction] = 0
};
}
}
return(new ConfusionMatrix <TSolution>(matrix));
}