de.lmu.ifi.dbs.elki.database.ids.DBIDs.isEmpty java code examples

Common ways to obtain DBIDs

private void myMethod () {
     DBIDs d =Relation relation;relation.getDBIDs()
Cluster clus;clus.getIDs()
Relation relation;RandomFactory rnd;DBIDUtil.randomSample(relation.getDBIDs(), k, rnd)
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}

@Override
public boolean isEmpty() {
 return inner.isEmpty();
}

@Override
public void contentChanged(DataStoreEvent e) {
 if (e.getInserts().isEmpty() && e.getRemovals().isEmpty() && !e.getUpdates().isEmpty()) {
  // Updates only.
  dotTableModel.fireTableDataChanged();
 }
 else {
  dotTableModel.fireTableStructureChanged();
 }
}

@Override
public void contentChanged(DataStoreEvent e) {
 if (e.getInserts().isEmpty() && e.getRemovals().isEmpty() && !e.getUpdates().isEmpty()) {
  // Updates only.
  dotTableModel.fireTableDataChanged();
 }
 else {
  dotTableModel.fireTableStructureChanged();
 }
}

/**
 * Loglikelihood anomalous objects. Uniform distribution.
 *
 * @param anomalousObjs
 * @return loglikelihood for anomalous objects
 */
private double loglikelihoodAnomalous(DBIDs anomalousObjs) {
 return anomalousObjs.isEmpty() ? 0 : anomalousObjs.size() * -FastMath.log(anomalousObjs.size());
}

/**
 * Loglikelihood anomalous objects. Uniform distribution.
 *
 * @param anomalousObjs
 * @return loglikelihood for anomalous objects
 */
private double loglikelihoodAnomalous(DBIDs anomalousObjs) {
 return anomalousObjs.isEmpty() ? 0 : anomalousObjs.size() * -FastMath.log(anomalousObjs.size());
}

/**
 * Format a DBID as string.
 *
 * @param ids DBIDs
 * @return String representation
 */
public static String toString(DBIDs ids) {
 final DBIDFactory factory = DBIDFactory.FACTORY;
 if(ids instanceof DBID) {
  return factory.toString((DBID) ids);
 }
 if(ids.isEmpty()) {
  return "";
 }
 DBIDIter iter = ids.iter();
 StringBuilder buf = new StringBuilder(ids.size() * 6) //
   .append(factory.toString(iter));
 while(iter.advance().valid()) {
  buf.append(',').append(factory.toString(iter));
 }
 return buf.toString();
}

/**
 * Format a DBID as string.
 *
 * @param ids DBIDs
 * @return String representation
 */
public static String toString(DBIDs ids) {
 final DBIDFactory factory = DBIDFactory.FACTORY;
 if(ids instanceof DBID) {
  return factory.toString((DBID) ids);
 }
 if(ids.isEmpty()) {
  return "";
 }
 DBIDIter iter = ids.iter();
 StringBuilder buf = new StringBuilder(ids.size() * 6) //
   .append(factory.toString(iter));
 while(iter.advance().valid()) {
  buf.append(',').append(factory.toString(iter));
 }
 return buf.toString();
}

/**
 * Build a standard k-means result, with known cluster variance sums.
 *
 * @return Clustering result
 */
protected Clustering<KMeansModel> buildResult() {
 Clustering<KMeansModel> result = new Clustering<>("k-Means Clustering", "kmeans-clustering");
 for(int i = 0; i < clusters.size(); i++) {
  DBIDs ids = clusters.get(i);
  if(ids.isEmpty()) {
   getLogger().warning("K-Means produced an empty cluster - bad initialization?");
  }
  result.addToplevelCluster(new Cluster<>(ids, new KMeansModel(means[i], varsum[i])));
 }
 return result;
}

/**
 * Build a standard k-means result, with known cluster variance sums.
 *
 * @return Clustering result
 */
protected Clustering<KMeansModel> buildResult() {
 Clustering<KMeansModel> result = new Clustering<>("k-Means Clustering", "kmeans-clustering");
 for(int i = 0; i < clusters.size(); i++) {
  DBIDs ids = clusters.get(i);
  if(ids.isEmpty()) {
   getLogger().warning("K-Means produced an empty cluster - bad initialization?");
  }
  result.addToplevelCluster(new Cluster<>(ids, new KMeansModel(means[i], varsum[i])));
 }
 return result;
}

/**
 * Computes the loglikelihood of all normal objects. Gaussian model
 *
 * @param objids Object IDs for 'normal' objects.
 * @param database Database
 * @return loglikelihood for normal objects
 */
private double loglikelihoodNormal(DBIDs objids, Relation<V> database) {
 if(objids.isEmpty()) {
  return 0;
 }
 CovarianceMatrix builder = CovarianceMatrix.make(database, objids);
 Vector mean = builder.getMeanVector();
 Matrix covarianceMatrix = builder.destroyToSampleMatrix();
 // test singulaere matrix
 Matrix covInv = covarianceMatrix.cheatToAvoidSingularity(SINGULARITY_CHEAT).inverse();
 double covarianceDet = covarianceMatrix.det();
 double fakt = 1.0 / Math.sqrt(MathUtil.powi(MathUtil.TWOPI, RelationUtil.dimensionality(database)) * covarianceDet);
 // for each object compute probability and sum
 double prob = 0;
 for(DBIDIter iter = objids.iter(); iter.valid(); iter.advance()) {
  Vector x = database.get(iter).getColumnVector().minusEquals(mean);
  double mDist = x.transposeTimesTimes(covInv, x);
  prob += Math.log(fakt * Math.exp(-mDist / 2.0));
 }
 return prob;
}

/**
 * Inserts the specified objects into this index. If a bulk load mode is
 * implemented, the objects are inserted in one bulk.
 * 
 * @param ids the objects to be inserted
 */
@Override
public final void insertAll(DBIDs ids) {
 if(ids.isEmpty() || (ids.size() == 1)) {
  return;
 }
 // Make an example leaf
 if(canBulkLoad()) {
  List<SpatialEntry> leafs = new ArrayList<>(ids.size());
  for (DBIDIter iter = ids.iter(); iter.valid(); iter.advance()) {
   leafs.add(createNewLeafEntry(DBIDUtil.deref(iter)));
  }
  bulkLoad(leafs);
 }
 else {
  for (DBIDIter iter = ids.iter(); iter.valid(); iter.advance()) {
   insert(iter);
  }
 }
 doExtraIntegrityChecks();
}

/**
 * Inserts the specified objects into this index. If a bulk load mode is
 * implemented, the objects are inserted in one bulk.
 * 
 * @param ids the objects to be inserted
 */
@Override
public void insertAll(DBIDs ids) {
 if(ids.isEmpty()) {
  return;
 }
 // Make an example leaf
 if(canBulkLoad()) {
  List<SpatialEntry> leafs = new ArrayList<>(ids.size());
  for(DBIDIter iter = ids.iter(); iter.valid(); iter.advance()) {
   leafs.add(createNewLeafEntry(iter));
  }
  bulkLoad(leafs);
 }
 else {
  for(DBIDIter iter = ids.iter(); iter.valid(); iter.advance()) {
   insert(DBIDUtil.deref(iter));
  }
 }
 doExtraIntegrityChecks();
}

/**
 * Inserts the specified objects into this index. If a bulk load mode is
 * implemented, the objects are inserted in one bulk.
 * 
 * @param ids the objects to be inserted
 */
@Override
public final void insertAll(DBIDs ids) {
 if(ids.isEmpty() || (ids.size() == 1)) {
  return;
 }
 // Make an example leaf
 if(canBulkLoad()) {
  List<SpatialEntry> leafs = new ArrayList<>(ids.size());
  for (DBIDIter iter = ids.iter(); iter.valid(); iter.advance()) {
   leafs.add(createNewLeafEntry(DBIDUtil.deref(iter)));
  }
  bulkLoad(leafs);
 }
 else {
  for (DBIDIter iter = ids.iter(); iter.valid(); iter.advance()) {
   insert(iter);
  }
 }
 doExtraIntegrityChecks();
}

/**
 * Inserts the specified objects into this index. If a bulk load mode is
 * implemented, the objects are inserted in one bulk.
 * 
 * @param ids the objects to be inserted
 */
@Override
public final void insertAll(DBIDs ids) {
 if(ids.isEmpty() || (ids.size() == 1)) {
  return;
 }
 // Make an example leaf
 if(canBulkLoad()) {
  List<DeLiCluEntry> leafs = new ArrayList<>(ids.size());
  for(DBIDIter iter = ids.iter(); iter.valid(); iter.advance()) {
   leafs.add(createNewLeafEntry(DBIDUtil.deref(iter)));
  }
  bulkLoad(leafs);
 }
 else {
  for(DBIDIter iter = ids.iter(); iter.valid(); iter.advance()) {
   insert(iter);
  }
 }
 doExtraIntegrityChecks();
}

/**
 * Inserts the specified objects into this index. If a bulk load mode is
 * implemented, the objects are inserted in one bulk.
 *
 * @param ids the objects to be inserted
 */
@Override
public final void insertAll(DBIDs ids) {
 if(ids.isEmpty() || (ids.size() == 1)) {
  return;
 }
 // Make an example leaf
 if(canBulkLoad()) {
  List<RdKNNEntry> leafs = new ArrayList<>(ids.size());
  for(DBIDIter iter = ids.iter(); iter.valid(); iter.advance()) {
   leafs.add(createNewLeafEntry(DBIDUtil.deref(iter)));
  }
  bulkLoad(leafs);
 }
 else {
  for(DBIDIter iter = ids.iter(); iter.valid(); iter.advance()) {
   insert(iter);
  }
 }
 doExtraIntegrityChecks();
}

/**
 * Inserts the specified objects into this index. If a bulk load mode is
 * implemented, the objects are inserted in one bulk.
 * 
 * @param ids the objects to be inserted
 */
@Override
public final void insertAll(DBIDs ids) {
 if(ids.isEmpty() || (ids.size() == 1)) {
  return;
 }
 // Make an example leaf
 if(canBulkLoad()) {
  List<DeLiCluEntry> leafs = new ArrayList<>(ids.size());
  for(DBIDIter iter = ids.iter(); iter.valid(); iter.advance()) {
   leafs.add(createNewLeafEntry(DBIDUtil.deref(iter)));
  }
  bulkLoad(leafs);
 }
 else {
  for(DBIDIter iter = ids.iter(); iter.valid(); iter.advance()) {
   insert(iter);
  }
 }
 doExtraIntegrityChecks();
}

/**
 * Inserts the specified objects into this index. If a bulk load mode is
 * implemented, the objects are inserted in one bulk.
 * 
 * @param ids the objects to be inserted
 */
@Override
public final void insertAll(DBIDs ids) {
 if(ids.isEmpty() || (ids.size() == 1)) {
  return;
 }
 // Make an example leaf
 if(canBulkLoad()) {
  List<SpatialEntry> leafs = new ArrayList<>(ids.size());
  for (DBIDIter iter = ids.iter(); iter.valid(); iter.advance()) {
   leafs.add(createNewLeafEntry(DBIDUtil.deref(iter)));
  }
  bulkLoad(leafs);
 }
 else {
  for (DBIDIter iter = ids.iter(); iter.valid(); iter.advance()) {
   insert(iter);
  }
 }
 doExtraIntegrityChecks();
}

/**
 * Inserts the specified objects into this index. If a bulk load mode is
 * implemented, the objects are inserted in one bulk.
 *
 * @param ids the objects to be inserted
 */
@Override
public final void insertAll(DBIDs ids) {
 if(ids.isEmpty() || (ids.size() == 1)) {
  return;
 }
 // Make an example leaf
 if(canBulkLoad()) {
  List<RdKNNEntry> leafs = new ArrayList<>(ids.size());
  for(DBIDIter iter = ids.iter(); iter.valid(); iter.advance()) {
   leafs.add(createNewLeafEntry(DBIDUtil.deref(iter)));
  }
  bulkLoad(leafs);
 }
 else {
  for(DBIDIter iter = ids.iter(); iter.valid(); iter.advance()) {
   insert(iter);
  }
 }
 doExtraIntegrityChecks();
}

/**
 * Inserts the specified objects into this index. If a bulk load mode is
 * implemented, the objects are inserted in one bulk.
 * 
 * @param ids the objects to be inserted
 */
@Override
public void insertAll(DBIDs ids) {
 if(ids.isEmpty() || (ids.size() == 1)) {
  return;
 }
 // Make an example leaf
 if(canBulkLoad()) {
  List<SpatialEntry> leafs = new ArrayList<>(ids.size());
  for(DBIDIter iter = ids.iter(); iter.valid(); iter.advance()) {
   leafs.add(createNewLeafEntry(iter));
  }
  bulkLoad(leafs);
 }
 else {
  for(DBIDIter iter = ids.iter(); iter.valid(); iter.advance()) {
   insert(DBIDUtil.deref(iter));
  }
 }
 doExtraIntegrityChecks();
}

/**
 * Inserts the specified objects into this index. If a bulk load mode is
 * implemented, the objects are inserted in one bulk.
 *
 * @param ids the objects to be inserted
 */
@Override
public final void insertAll(DBIDs ids) {
 if(ids.isEmpty() || (ids.size() == 1)) {
  return;
 }
 // Make an example leaf
 if(canBulkLoad()) {
  List<RdKNNEntry> leafs = new ArrayList<>(ids.size());
  for(DBIDIter iter = ids.iter(); iter.valid(); iter.advance()) {
   leafs.add(createNewLeafEntry(DBIDUtil.deref(iter)));
  }
  bulkLoad(leafs);
 }
 else {
  for(DBIDIter iter = ids.iter(); iter.valid(); iter.advance()) {
   insert(iter);
  }
 }
 doExtraIntegrityChecks();
}

Javadoc

Test for an empty DBID collection.

Popular methods of DBIDs

iter
Get a DBID iterator (a more efficient API). Example: for(DBIDIter iter = ids.iter(); iter.valid();
size
Retrieve the collection / data size.
contains
Test whether an ID is contained.

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