public char[] Classify(RecordSet data, bool parallel = true)
{
Score scores = this.Scorer.Score(data, parallel);
double[] ratios = Yarr.Div(scores.SScores, scores.BScores);
char[] result = new char[data.NRows];
for (int i = 0; i < data.NRows; i++)
{
result[i] = (ratios[i] >= this.Cutoff) ? 's' : 'b';
}
return(result);
}
private BlockingCollection <Score> ParallelScorer(RecordSet data)
{
int cores = Environment.ProcessorCount;
var models = new BlockingCollection <T>(this.SubModels.Count);
foreach (T model in this.SubModels)
{
models.Add(model);
}
models.CompleteAdding();
var scores = new BlockingCollection <RandomForest.Score>(cores * 10);
int numScorerTasks = cores;
Task[] scorerTasks = new Task[numScorerTasks];
for (int i = 0; i < numScorerTasks; i++)
{
scorerTasks[i] = Task.Factory.StartNew(
() =>
{
T model;
while (!models.IsCompleted)
{
try
{
model = models.Take();
}
catch (InvalidOperationException)
{
continue;
}
scores.Add(model.Score(data, parallel: false));
}
}
);
}
//asynchronously wait for the scorer tasks to finish
Task.Factory.StartNew(
() =>
{
Task.WaitAll(scorerTasks);
scores.CompleteAdding();
}
);
return(scores);
}
public Score Score(RecordSet data, bool parallel = true)
{
if (parallel)
{
return(ParallelGmeaner(
ParallelScorer(data),
data.NRows
));
}
else
{
return(GMean(
this.SubModels.Select(model => model.Score(data, parallel: false)),
data.NRows
));
}
}
protected RecordSet(RecordSet copyFrom, bool[] filter)
{
this.Index = Yarr.Filter(copyFrom.Index, filter);
this.NRows = this.Index.Length;
this.NFeatures = copyFrom.NFeatures;
this._EventIds = copyFrom._EventIds;
this.EventIds = new Indexer <int>(this, this._EventIds);
this._FeatureCols = copyFrom._FeatureCols;
this.FeatureCols = new Indexer <double> [this.NFeatures];
for (int featureNum = 0; featureNum < this.NFeatures; featureNum++)
{
this.FeatureCols[featureNum] = new Indexer <double>(this, this._FeatureCols[featureNum]);
}
this._GlobalMins = copyFrom._GlobalMins;
this._GlobalMaxs = copyFrom._GlobalMaxs;
}
public Score Score(RecordSet data, bool parallel = true)
{
//NOTE: ignore parallel parameter
double[] sScores = Yarr.Repeat(double.NaN, data.NRows);
double[] bScores = Yarr.Repeat(double.NaN, data.NRows);
bool[] filter = Yarr.InlineNot(data.HasNaN(this.TargetFeatures));
var filteredData = data.Filter(filter);
data = null; // unlikely to let anything be GC'ed (lots of references to same obj) but it can't hurt
this._Score(
filteredData,
Yarr.Range(filteredData.NRows).MakeSlice(),
sScores,
bScores
);
return(new Score(sScores, bScores));
}
public Indexer(RecordSet parent, T[] target)
{
Parent = parent;
Target = target;
}