Examples with NotImplementedException de.lmu.ifi.dbs.elki.utilities.exceptions.NotImplementedException used on opensource projects

Example 1 with NotImplementedException

use of de.lmu.ifi.dbs.elki.utilities.exceptions.NotImplementedException in project elki by elki-project.

the class KMedoidsPAM method run.

/**
 * Run k-medoids
 *
 * @param database Database
 * @param relation relation to use
 * @return result
 */
public Clustering<MedoidModel> run(Database database, Relation<V> relation) {
    if (relation.size() <= 0) {
        return new Clustering<>("PAM Clustering", "pam-clustering");
    }
    if (k > 0x7FFF) {
        throw new NotImplementedException("PAM supports at most " + 0x7FFF + " clusters.");
    }
    DistanceQuery<V> distQ = DatabaseUtil.precomputedDistanceQuery(database, relation, getDistanceFunction(), LOG);
    DBIDs ids = relation.getDBIDs();
    // Choose initial medoids
    if (LOG.isStatistics()) {
        LOG.statistics(new StringStatistic(KEY + ".initialization", initializer.toString()));
    }
    ArrayModifiableDBIDs medoids = DBIDUtil.newArray(initializer.chooseInitialMedoids(k, ids, distQ));
    if (medoids.size() != k) {
        throw new AbortException("Initializer " + initializer.toString() + " did not return " + k + " means, but " + medoids.size());
    }
    // Setup cluster assignment store
    WritableIntegerDataStore assignment = DataStoreUtil.makeIntegerStorage(ids, DataStoreFactory.HINT_HOT | DataStoreFactory.HINT_TEMP, -1);
    run(distQ, ids, medoids, assignment);
    ArrayModifiableDBIDs[] clusters = ClusteringAlgorithmUtil.partitionsFromIntegerLabels(ids, assignment, k);
    // Wrap result
    Clustering<MedoidModel> result = new Clustering<>("PAM Clustering", "pam-clustering");
    for (DBIDArrayIter it = medoids.iter(); it.valid(); it.advance()) {
        result.addToplevelCluster(new Cluster<>(clusters[it.getOffset()], new MedoidModel(DBIDUtil.deref(it))));
    }
    return result;
}