/** Creates a new holder for sliding-window instances. */
public CompactCandidateSegmentGroup(FeatureFactory factory, CandidateSegmentGroup group) {
// The length of the original sequence
this.sequenceLength = group.getSequenceLength();
// The maximum length of any sliding window
this.maxWindowSize = group.getMaxWindowSize();
this.totalSize = group.size();
this.classNameSet = group.classNameSet();
this.subPopId = group.getSubpopulationId();
unitInstance = new Instance[sequenceLength];
delta = new Delta[sequenceLength][maxWindowSize];
label = new ClassLabel[sequenceLength][maxWindowSize];
segmentSource = new Object[sequenceLength][maxWindowSize];
for (int i = 0; i < sequenceLength; i++) {
unitInstance[i] = factory.compress(group.getSubsequenceInstance(i, i + 1));
}
for (int i = 0; i < sequenceLength; i++) {
for (int j = i + 1; j - i <= maxWindowSize; j++) {
if (group.getSubsequenceInstance(i, j) != null) {
label[i][j - i - 1] = group.getSubsequenceLabel(i, j);
segmentSource[i][j - i - 1] = group.getSubsequenceInstance(i, j).getSource();
delta[i][j - i - 1] = new Delta(factory, i, j, group.getSubsequenceInstance(i, j));
}
}
}
}
/**
* Collect the correct segments for this example. These are defined as all segments with
* non-NEGATIVE labels, and all unit-length negative labels not inside a positives label.
*/
private Segmentation correctSegments(
CandidateSegmentGroup g, ExampleSchema schema, int maxSegmentSize) {
Segmentation result = new Segmentation(schema);
int pos, len;
for (pos = 0; pos < g.getSequenceLength(); ) {
boolean addedASegmentStartingAtPos = false;
for (len = 1; !addedASegmentStartingAtPos && len <= maxSegmentSize; len++) {
Instance inst = g.getSubsequenceInstance(pos, pos + len);
ClassLabel label = g.getSubsequenceLabel(pos, pos + len);
if (inst != null && !label.isNegative()) {
result.add(
new Segmentation.Segment(
pos, pos + len, schema.getClassIndex(label.bestClassName())));
addedASegmentStartingAtPos = true;
pos += len;
}
}
if (!addedASegmentStartingAtPos) {
// Instance inst = g.getSubsequenceInstance(pos,pos+1);
// ClassLabel label = g.getSubsequenceLabel(pos,pos+1);
result.add(
new Segmentation.Segment(
pos, pos + 1, schema.getClassIndex(ExampleSchema.NEG_CLASS_NAME)));
pos += 1;
}
}
return result;
}
