/**
* Checks if a node is legitimate. A node is illegitimate if its hamming distance to a pruned node
* is 1 (this is, the node is a child of a previously pruned node).
*
* @param f node to check its legitimacy
* @return true if the node is legitimate, false otherwise.
*/
private boolean legitimate(boolean f[]) {
boolean feas = true;
for (int i = 0; i < pruned.size() && feas; i++) {
if (hamming(pruned.elementAt(i), f) == 1) feas = false;
}
return feas;
}
/** Recursive method for ABB */
private void abb(boolean feat[]) {
boolean[] child;
double measure;
threshold = data.measureIEP(feat);
for (int i = 0; i < cardinalidadCto(feat); i++) {
child = removeOne(feat, i);
measure = data.measureIEP(child);
if (legitimate(child) && measure < threshold) {
if (measure < data.measureIEP(features)) {
// we keep the best found in 'features'
System.arraycopy(child, 0, features, 0, child.length);
}
abb(child);
} else { // we prune this node
pruned.add(child);
}
}
}