Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/3702#discussion_r22183579
--- Diff:
mllib/src/test/scala/org/apache/spark/mllib/evaluation/BinaryClassificationMetricsSuite.scala
---
@@ -124,4 +124,36 @@ class BinaryClassificationMetricsSuite extends
FunSuite with MLlibTestSparkConte
validateMetrics(metrics, thresholds, rocCurve, prCurve, f1, f2,
precisions, recalls)
}
+
+ test("binary evaluation metrics with downsampling") {
+ val scoreAndLabels = Seq(
+ (0.1, 0.0), (0.2, 0.0), (0.3, 1.0), (0.4, 0.0), (0.5, 0.0),
+ (0.6, 1.0), (0.7, 1.0), (0.8, 0.0), (0.9, 1.0))
+
+ val scoreAndLabelsRDD = sc.parallelize(scoreAndLabels, 1)
+
+ val original = new BinaryClassificationMetrics(scoreAndLabelsRDD)
+ val originalROC = original.roc().collect().sorted.toList
+ // Add 2 for (0,0) and (1,1) appended at either end
+ assert(2 + scoreAndLabels.size == originalROC.size)
+ assert(
+ List(
+ (0.0,0.0),(0.0,0.25),(0.2,0.25),(0.2,0.5),(0.2,0.75),(0.4,0.75),
--- End diff --
Scala style (spaces) (not sure how strict this is when it's a list of
values like this in a test)
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