Examples with KDistanceProcessor de.lmu.ifi.dbs.elki.parallel.processor.KDistanceProcessor used on opensource projects

Example 1 with KDistanceProcessor

use of de.lmu.ifi.dbs.elki.parallel.processor.KDistanceProcessor in project elki by elki-project.

the class ParallelKNNOutlier method run.

public OutlierResult run(Database database, Relation<O> relation) {
    DBIDs ids = relation.getDBIDs();
    WritableDoubleDataStore store = DataStoreUtil.makeDoubleStorage(ids, DataStoreFactory.HINT_DB);
    DistanceQuery<O> distq = database.getDistanceQuery(relation, getDistanceFunction());
    KNNQuery<O> knnq = database.getKNNQuery(distq, k + 1);
    // Compute the kNN
    KNNProcessor<O> knnm = new KNNProcessor<>(k + 1, knnq);
    SharedObject<KNNList> knnv = new SharedObject<>();
    knnm.connectKNNOutput(knnv);
    // Extract the k-distance
    KDistanceProcessor kdistm = new KDistanceProcessor(k + 1);
    SharedDouble kdistv = new SharedDouble();
    kdistm.connectKNNInput(knnv);
    kdistm.connectOutput(kdistv);
    // Store in outlier scores
    WriteDoubleDataStoreProcessor storem = new WriteDoubleDataStoreProcessor(store);
    storem.connectInput(kdistv);
    // Gather statistics
    DoubleMinMaxProcessor mmm = new DoubleMinMaxProcessor();
    mmm.connectInput(kdistv);
    ParallelExecutor.run(ids, knnm, kdistm, storem, mmm);
    DoubleMinMax minmax = mmm.getMinMax();
    DoubleRelation scoreres = new MaterializedDoubleRelation("kNN Outlier Score", "knn-outlier", store, ids);
    OutlierScoreMeta meta = new BasicOutlierScoreMeta(minmax.getMin(), minmax.getMax(), 0.0, Double.POSITIVE_INFINITY, 0.0);
    return new OutlierResult(meta, scoreres);
}

Example 2 with KDistanceProcessor

use of de.lmu.ifi.dbs.elki.parallel.processor.KDistanceProcessor in project elki by elki-project.

the class ParallelLOF method run.

public OutlierResult run(Database database, Relation<O> relation) {
    DBIDs ids = relation.getDBIDs();
    DistanceQuery<O> distq = database.getDistanceQuery(relation, getDistanceFunction());
    KNNQuery<O> knnq = database.getKNNQuery(distq, k + 1);
    // Phase one: KNN and k-dist
    WritableDoubleDataStore kdists = DataStoreUtil.makeDoubleStorage(ids, DataStoreFactory.HINT_DB);
    WritableDataStore<KNNList> knns = DataStoreUtil.makeStorage(ids, DataStoreFactory.HINT_DB, KNNList.class);
    {
        // Compute kNN
        KNNProcessor<O> knnm = new KNNProcessor<>(k + 1, knnq);
        SharedObject<KNNList> knnv = new SharedObject<>();
        WriteDataStoreProcessor<KNNList> storek = new WriteDataStoreProcessor<>(knns);
        knnm.connectKNNOutput(knnv);
        storek.connectInput(knnv);
        // Compute k-dist
        KDistanceProcessor kdistm = new KDistanceProcessor(k + 1);
        SharedDouble kdistv = new SharedDouble();
        WriteDoubleDataStoreProcessor storem = new WriteDoubleDataStoreProcessor(kdists);
        kdistm.connectKNNInput(knnv);
        kdistm.connectOutput(kdistv);
        storem.connectInput(kdistv);
        ParallelExecutor.run(ids, knnm, storek, kdistm, storem);
    }
    // Phase two: lrd
    WritableDoubleDataStore lrds = DataStoreUtil.makeDoubleStorage(ids, DataStoreFactory.HINT_DB);
    {
        LRDProcessor lrdm = new LRDProcessor(knns, kdists);
        SharedDouble lrdv = new SharedDouble();
        WriteDoubleDataStoreProcessor storelrd = new WriteDoubleDataStoreProcessor(lrds);
        lrdm.connectOutput(lrdv);
        storelrd.connectInput(lrdv);
        ParallelExecutor.run(ids, lrdm, storelrd);
    }
    // No longer needed.
    kdists.destroy();
    kdists = null;
    // Phase three: LOF
    WritableDoubleDataStore lofs = DataStoreUtil.makeDoubleStorage(ids, DataStoreFactory.HINT_DB);
    DoubleMinMax minmax;
    {
        LOFProcessor lofm = new LOFProcessor(knns, lrds, true);
        SharedDouble lofv = new SharedDouble();
        DoubleMinMaxProcessor mmm = new DoubleMinMaxProcessor();
        WriteDoubleDataStoreProcessor storelof = new WriteDoubleDataStoreProcessor(lofs);
        lofm.connectOutput(lofv);
        mmm.connectInput(lofv);
        storelof.connectInput(lofv);
        ParallelExecutor.run(ids, lofm, storelof, mmm);
        minmax = mmm.getMinMax();
    }
    DoubleRelation scoreres = new MaterializedDoubleRelation("Local Outlier Factor", "lof-outlier", lofs, ids);
    OutlierScoreMeta meta = new BasicOutlierScoreMeta(minmax.getMin(), minmax.getMax(), 0.0, Double.POSITIVE_INFINITY, 1.0);
    return new OutlierResult(meta, scoreres);
}