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Class can be "static" (improves encapsulation).

This commit is contained in:
Gilles Sadowski 2020-03-22 16:09:41 +01:00
parent 7741ddb814
commit 6b0395898e
1 changed files with 18 additions and 2 deletions
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20
src/main/java/org/apache/commons/math4/ml/clustering/MiniBatchKMeansClusterer.java
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@ -119,7 +119,8 @@ public class MiniBatchKMeansClusterer<T extends Clusterable>
final List<T> pointList = new ArrayList<>(points);
List<CentroidCluster<T>> clusters = initialCenters(pointList);
final MiniBatchImprovementEvaluator evaluator = new MiniBatchImprovementEvaluator();
final ImprovementEvaluator evaluator = new ImprovementEvaluator(batchSize,
maxNoImprovementTimes);
for (int i = 0; i < max; i++) {
clearClustersPoints(clusters);
final List<T> batchPoints = ListSampler.sample(getRandomGenerator(), pointList, batchSize);
@ -238,7 +239,11 @@ public class MiniBatchKMeansClusterer<T extends Clusterable>
* The evaluator checks whether improvement occurred during the
* {@link #maxNoImprovementTimes allowed number of successive iterations}.
*/
private class MiniBatchImprovementEvaluator {
private static class ImprovementEvaluator {
/** Batch size. */
private final int batchSize;
/** Maximum number of iterations during which no improvement is occuring. */
private final int maxNoImprovementTimes;
/** Missing doc. */
private double ewaInertia = Double.NaN;
/** Missing doc. */
@ -246,6 +251,17 @@ public class MiniBatchKMeansClusterer<T extends Clusterable>
/** Missing doc. */
private int noImprovementTimes = 0;
/**
* @param batchSize Number of elements for each batch iteration.
* @param maxNoImprovementTimes Maximum number of iterations during
* which no improvement is occuring.
*/
private ImprovementEvaluator(int batchSize,
int maxNoImprovementTimes) {
this.batchSize = batchSize;
this.maxNoImprovementTimes = maxNoImprovementTimes;
}
/**
* Stopping criterion.
*