Examples with PCAFilteredResult de.lmu.ifi.dbs.elki.math.linearalgebra.pca.PCAFilteredResult used on opensource projects

Example 6 with PCAFilteredResult

use of de.lmu.ifi.dbs.elki.math.linearalgebra.pca.PCAFilteredResult in project elki by elki-project.

the class AbstractFilteredPCAIndex method initialize.

@Override
public void initialize() {
    if (relation == null || relation.size() <= 0) {
        throw new EmptyDataException();
    }
    // recomputed for the partitions!
    if (storage != null) {
        return;
    }
    storage = DataStoreUtil.makeStorage(relation.getDBIDs(), DataStoreFactory.HINT_HOT | DataStoreFactory.HINT_TEMP, PCAFilteredResult.class);
    long start = System.currentTimeMillis();
    FiniteProgress progress = getLogger().isVerbose() ? new FiniteProgress("Performing local PCA", relation.size(), getLogger()) : null;
    // TODO: use a bulk operation?
    for (DBIDIter iditer = relation.iterDBIDs(); iditer.valid(); iditer.advance()) {
        DoubleDBIDList objects = objectsForPCA(iditer);
        SortedEigenPairs epairs = pca.processIds(objects, relation).getEigenPairs();
        int numstrong = filter.filter(epairs.eigenValues());
        PCAFilteredResult pcares = new PCAFilteredResult(epairs, numstrong, 1., 0.);
        storage.put(iditer, pcares);
        getLogger().incrementProcessed(progress);
    }
    getLogger().ensureCompleted(progress);
    long end = System.currentTimeMillis();
    if (getLogger().isVerbose()) {
        long elapsedTime = end - start;
        getLogger().verbose(this.getClass().getName() + " runtime: " + elapsedTime + " milliseconds.");
    }
}