/// <summary>
/// Thread operation fo calculate statistics for [stat].
///
/// [stat] is guarenteed to be unique, however stat.Assignment is not, hence stat.Assignment must be locked.
///
/// Currently only stat.Assignment.AssignmentStatistics is the only member to be R/W locked, since that is all
/// that is modified.
/// </summary>
private static void Thread_CalculateAssignmentStatistics([Const] EClustererStatistics statistics, [MutableUnsafe] ForStat stat, [Const] Cluster[] realClusters, [Const] ConfigurationMetric metric, [MutableSafe] ProgressParallelHandler prog)
{
prog.SafeIncrement();
// STATS: Distance from avg
if (stat.ClusterVector != null)
{
// Euclidean
if (statistics.HasFlag(EClustererStatistics.EuclideanFromAverage))
{
double ed = Maths.Euclidean(stat.AssignmentVector.Values, stat.ClusterVector);
stat.Assignment.AssignmentStatistics.ThreadSafeIndex(CreatePartialKey(stat.ObsFilter, STAT_ASSIGNMENT_EUCLIDEAN_FROM_AVG), ed);
stat.Assignment.AssignmentStatistics.ThreadSafeIndex(CreatePartialKey(stat.ObsFilter, STAT_ASSIGNMENT_EUCLIDEAN_FROM_AVG_SQUARED), ed * ed);
}
// Custom (if applicable)
if (metric != null &&
statistics.HasFlag(EClustererStatistics.DistanceFromAverage) &&
!(metric.Args.Id == Algo.ID_METRIC_EUCLIDEAN && statistics.HasFlag(EClustererStatistics.EuclideanFromAverage)))
{
string key1 = metric.ToString() + STAT_ASSIGNMENT_DISTANCE_FROM_AVG;
string key2 = metric.ToString() + STAT_ASSIGNMENT_DISTANCE_FROM_AVG_SQUARED;
double dd = metric.Calculate(stat.AssignmentVector.Values, stat.ClusterVector);
stat.Assignment.AssignmentStatistics.ThreadSafeIndex(CreatePartialKey(stat.ObsFilter, key1), dd);
stat.Assignment.AssignmentStatistics.ThreadSafeIndex(CreatePartialKey(stat.ObsFilter, key2), dd * dd);
}
}
// STATS: Silhouette
Cluster nextNearestCluster = null;
if (statistics.HasFlag(EClustererStatistics.SilhouetteWidth))
{
double silhouetteWidth;
double nextNearestClusterId;
ClustererStatisticsHelper.CalculateSilhouette(stat, realClusters, out silhouetteWidth, out nextNearestCluster);
if (!double.TryParse(nextNearestCluster.ShortName, out nextNearestClusterId))
{
nextNearestClusterId = double.NaN;
}
// Silhouette
stat.Assignment.AssignmentStatistics.ThreadSafeIndex(CreatePartialKey(stat.ObsFilter, STAT_ASSIGNMENT_SILHOUETTE_WIDTH), silhouetteWidth);
stat.Assignment.AssignmentStatistics.ThreadSafeIndex(CreatePartialKey(stat.ObsFilter, STAT_ASSIGNMENT_NEXT_NEAREST_CLUSTER), nextNearestClusterId);
}
// STATS: Score
if (stat.ObsFilter == null)
{
// Score
stat.Assignment.AssignmentStatistics.ThreadSafeIndex(STAT_ASSIGNMENT_SCORE, stat.Assignment.Score);
// Next nearest cluster
stat.Assignment.NextNearestCluster = nextNearestCluster; // Only one ForStat per Assignment has ObsFilter == null so thread safe not required
}
}
