Github user mgaido91 commented on a diff in the pull request:
https://github.com/apache/spark/pull/22756#discussion_r226239196
--- Diff:
examples/src/main/java/org/apache/spark/examples/ml/JavaBisectingKMeansExample.java
---
@@ -50,9 +51,14 @@ public static void main(String[] args) {
BisectingKMeans bkm = new BisectingKMeans().setK(2).setSeed(1);
BisectingKMeansModel model = bkm.fit(dataset);
- // Evaluate clustering.
- double cost = model.computeCost(dataset);
- System.out.println("Within Set Sum of Squared Errors = " + cost);
+ // Make predictions
+ Dataset<Row> predictions = model.transform(dataset);
+
+ // Evaluate clustering by computing Silhouette score
+ ClusteringEvaluator evaluator = new ClusteringEvaluator();
+
+ double silhouette = evaluator.evaluate(predictions);
+ System.out.println("Silhouette with squared euclidean distance = " +
silhouette);
--- End diff --
thanks I'll do @dongjoon-hyun
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