@Override
public void observe(Model<VectorWritable> x) {
AbstractCluster cl = (AbstractCluster) x;
setS0(getS0() + cl.getS0());
setS1(getS1().plus(cl.getS1()));
setS2(getS2().plus(cl.getS2()));
}
protected AbstractCluster(Vector center2, Vector radius2, int id2) {
setNumObservations(0);
setTotalObservations(0);
setCenter(new RandomAccessSparseVector(center2));
setRadius(new RandomAccessSparseVector(radius2));
setS0(0);
setS1(center.like());
setS2(center.like());
this.id = id2;
}
public void observe(ClusterObservations observations) {
setS0(getS0() + observations.getS0());
if (getS1() == null) {
setS1(observations.getS1().clone());
} else {
getS1().assign(observations.getS1(), Functions.PLUS);
}
if (getS2() == null) {
setS2(observations.getS2().clone());
} else {
getS2().assign(observations.getS2(), Functions.PLUS);
}
}
public void observe(Vector x) {
setS0(getS0() + 1);
if (getS1() == null) {
setS1(x.clone());
} else {
getS1().assign(x, Functions.PLUS);
}
Vector x2 = x.times(x);
if (getS2() == null) {
setS2(x2);
} else {
getS2().assign(x2, Functions.PLUS);
}
}
public void observe(Vector x, double weight) {
if (weight == 1.0) {
observe(x);
} else {
setS0(getS0() + weight);
Vector weightedX = x.times(weight);
if (getS1() == null) {
setS1(weightedX);
} else {
getS1().assign(weightedX, Functions.PLUS);
}
Vector x2 = x.times(x).times(weight);
if (getS2() == null) {
setS2(x2);
} else {
getS2().assign(x2, Functions.PLUS);
}
}
}
@Override
public void computeParameters() {
if (getS0() == 0) {
return;
}
setNumObservations((long) getS0());
setTotalObservations(getTotalObservations() + getNumObservations());
setCenter(getS1().divide(getS0()));
// compute the component stds
if (getS0() > 1) {
setRadius(
getS2()
.times(getS0())
.minus(getS1().times(getS1()))
.assign(new SquareRootFunction())
.divide(getS0()));
}
setS0(0);
setS1(center.like());
setS2(center.like());
}
