internal static List <ClassificationMetrics> FromMetrics(IHostEnvironment env, IDataView overallMetrics, IDataView confusionMatrix,
int confusionMatriceStartIndex = 0)
{
Contracts.AssertValue(env);
env.AssertValue(overallMetrics);
env.AssertValue(confusionMatrix);
var metricsEnumerable = overallMetrics.AsEnumerable <SerializationClass>(env, true, ignoreMissingColumns: true);
if (!metricsEnumerable.GetEnumerator().MoveNext())
{
throw env.Except("The overall RegressionMetrics didn't have any rows.");
}
List <ClassificationMetrics> metrics = new List <ClassificationMetrics>();
var confusionMatrices = ConfusionMatrix.Create(env, confusionMatrix).GetEnumerator();
int index = 0;
foreach (var metric in metricsEnumerable)
{
if (index++ >= confusionMatriceStartIndex && !confusionMatrices.MoveNext())
{
throw env.Except("Confusion matrices didn't have enough matrices.");
}
metrics.Add(
new ClassificationMetrics()
{
AccuracyMicro = metric.AccuracyMicro,
AccuracyMacro = metric.AccuracyMacro,
LogLoss = metric.LogLoss,
LogLossReduction = metric.LogLossReduction,
TopKAccuracy = metric.TopKAccuracy,
PerClassLogLoss = metric.PerClassLogLoss,
ConfusionMatrix = confusionMatrices.Current,
RowTag = metric.RowTag,
});
}
return(metrics);
}