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package de.lmu.ifi.dbs.elki.algorithm.outlier.spatial.neighborhood;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2012
Ludwig-Maximilians-Universität München
Lehr- und Forschungseinheit für Datenbanksysteme
ELKI Development Team
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
import de.lmu.ifi.dbs.elki.data.type.TypeInformation;
import de.lmu.ifi.dbs.elki.database.datastore.DataStore;
import de.lmu.ifi.dbs.elki.database.datastore.DataStoreFactory;
import de.lmu.ifi.dbs.elki.database.datastore.DataStoreUtil;
import de.lmu.ifi.dbs.elki.database.datastore.WritableDataStore;
import de.lmu.ifi.dbs.elki.database.ids.DBID;
import de.lmu.ifi.dbs.elki.database.ids.DBIDIter;
import de.lmu.ifi.dbs.elki.database.ids.DBIDUtil;
import de.lmu.ifi.dbs.elki.database.ids.DBIDs;
import de.lmu.ifi.dbs.elki.database.ids.HashSetModifiableDBIDs;
import de.lmu.ifi.dbs.elki.database.ids.ModifiableDBIDs;
import de.lmu.ifi.dbs.elki.database.relation.Relation;
import de.lmu.ifi.dbs.elki.logging.Logging;
import de.lmu.ifi.dbs.elki.logging.progress.FiniteProgress;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.AbstractParameterizer;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.OptionID;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.constraints.GreaterEqualConstraint;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.parameterization.Parameterization;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.parameters.IntParameter;
import de.lmu.ifi.dbs.elki.utilities.optionhandling.parameters.ObjectParameter;
/**
* Neighborhood obtained by computing the k-fold closure of an existing
* neighborhood.
*
* @author Erich Schubert
*/
public class ExtendedNeighborhood extends AbstractPrecomputedNeighborhood {
/**
* The logger to use.
*/
static final Logging logger = Logging.getLogger(ExtendedNeighborhood.class);
/**
* Constructor.
*
* @param store The materialized data.
*/
public ExtendedNeighborhood(DataStore<DBIDs> store) {
super(store);
}
@Override
protected Logging getLogger() {
return logger;
}
@Override
public String getLongName() {
return "Extended Neighborhood";
}
@Override
public String getShortName() {
return "extended-neighborhood";
}
/**
* Factory class.
*
* @author Erich Schubert
*
* @apiviz.stereotype factory
* @apiviz.has ExtendedNeighborhood oneway - - «produces»
*/
public static class Factory<O> extends AbstractPrecomputedNeighborhood.Factory<O> {
/**
* Inner neighbor set predicate
*/
private NeighborSetPredicate.Factory<O> inner;
/**
* Number of steps to do
*/
private int steps;
/**
* Constructor.
*
* @param inner Inner neighbor set predicate
* @param steps Number of steps to do
*/
public Factory(NeighborSetPredicate.Factory<O> inner, int steps) {
super();
this.inner = inner;
this.steps = steps;
}
@Override
public NeighborSetPredicate instantiate(Relation<? extends O> database) {
DataStore<DBIDs> store = extendNeighborhood(database);
ExtendedNeighborhood neighborhood = new ExtendedNeighborhood(store);
return neighborhood;
}
@Override
public TypeInformation getInputTypeRestriction() {
return inner.getInputTypeRestriction();
}
/**
* Method to load the external neighbors.
*/
private DataStore<DBIDs> extendNeighborhood(Relation<? extends O> database) {
NeighborSetPredicate innerinst = inner.instantiate(database);
final WritableDataStore<DBIDs> store = DataStoreUtil.makeStorage(database.getDBIDs(), DataStoreFactory.HINT_HOT | DataStoreFactory.HINT_STATIC | DataStoreFactory.HINT_TEMP, DBIDs.class);
// Expand multiple steps
FiniteProgress progress = logger.isVerbose() ? new FiniteProgress("Expanding neighborhoods", database.size(), logger) : null;
for(DBIDIter iter = database.iterDBIDs(); iter.valid(); iter.advance()) {
DBID id = iter.getDBID();
HashSetModifiableDBIDs res = DBIDUtil.newHashSet(id);
DBIDs todo = id;
for(int i = 0; i < steps; i++) {
ModifiableDBIDs ntodo = DBIDUtil.newHashSet();
for(DBIDIter iter2 = todo.iter(); iter2.valid(); iter2.advance()) {
DBIDs add = innerinst.getNeighborDBIDs(iter2.getDBID());
if(add != null) {
for(DBIDIter iter3 = add.iter(); iter.valid(); iter.advance()) {
DBID nid = iter3.getDBID();
if(res.contains(nid)) {
continue;
}
ntodo.add(nid);
res.add(nid);
}
}
}
if(ntodo.size() == 0) {
continue;
}
todo = ntodo;
}
store.put(id, res);
if(progress != null) {
progress.incrementProcessed(logger);
}
}
if(progress != null) {
progress.ensureCompleted(logger);
}
return store;
}
/**
* Parameterization class.
*
* @author Erich Schubert
*
* @apiviz.exclude
*/
public static class Parameterizer<O> extends AbstractParameterizer {
/**
* Parameter to specify the neighborhood predicate to use.
*/
public static final OptionID NEIGHBORHOOD_ID = OptionID.getOrCreateOptionID("extendedneighbors.neighborhood", "The inner neighborhood predicate to use.");
/**
* Parameter to specify the number of steps allowed
*/
public static final OptionID STEPS_ID = OptionID.getOrCreateOptionID("extendedneighbors.steps", "The number of steps allowed in the neighborhood graph.");
/**
* The number of steps to do.
*/
private int steps;
/**
* Inner neighbor set predicate
*/
private NeighborSetPredicate.Factory<O> inner;
/**
* Inner neighborhood parameter.
*
* @param config Parameterization
* @return Inner neighborhood.
*/
protected static <O> NeighborSetPredicate.Factory<O> getParameterInnerNeighborhood(Parameterization config) {
final ObjectParameter<NeighborSetPredicate.Factory<O>> param = new ObjectParameter<NeighborSetPredicate.Factory<O>>(NEIGHBORHOOD_ID, NeighborSetPredicate.Factory.class);
if(config.grab(param)) {
return param.instantiateClass(config);
}
return null;
}
@Override
protected void makeOptions(Parameterization config) {
super.makeOptions(config);
inner = getParameterInnerNeighborhood(config);
steps = getParameterSteps(config);
}
/**
* Get the number of steps to do in the neighborhood graph.
*
* @param config Parameterization
* @return number of steps, default 1
*/
public static int getParameterSteps(Parameterization config) {
final IntParameter param = new IntParameter(STEPS_ID, new GreaterEqualConstraint(1));
if(config.grab(param)) {
return param.getValue();
}
return 1;
}
@Override
protected ExtendedNeighborhood.Factory<O> makeInstance() {
return new ExtendedNeighborhood.Factory<O>(inner, steps);
}
}
}
}
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