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DBScan.java
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DBScan.java
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package me.mcnelis.rudder.ml.unsupervised.clustering;
import java.util.ArrayList;
import me.mcnelis.rudder.data.Record;
public class DBScan extends DensityBased {
protected DBScan(double epsilon, int minPts) {
super(epsilon, minPts);
}
@Override
protected ArrayList<Cluster> cluster() {
for (Record r : this.sourceData) {
if (!r.isVisited()) {
r.setVisited();
Cluster c = this.rangeQuery(r);
if (c.getElements().size() < this.minPts) {
r.setIsNoise();
} else {
Cluster addCluster = this.expandCluster(r, c);
this.clusters.add(addCluster);
}
}
}
return this.clusters;
}
protected Cluster expandCluster(Record r, Cluster c) {
Cluster newCluster = new Cluster();
newCluster.addRecord(r);
for (Record rPrime : c.getElements()) {
if (!rPrime.isVisited()) {
rPrime.setVisited();
Cluster cluster = this.rangeQuery(rPrime);
if (cluster.getElements().size() >= this.minPts) {
cluster.combineClusters(this.expandCluster(rPrime, cluster));
}
}
if (!rPrime.isAssigned())
newCluster.addRecord(rPrime);
}
return newCluster;
}
}