Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/18428#discussion_r125175803
--- Diff:
mllib/src/test/scala/org/apache/spark/ml/tuning/CrossValidatorSuite.scala ---
@@ -156,6 +156,52 @@ class CrossValidatorSuite
CrossValidatorSuite.compareParamMaps(cv.getEstimatorParamMaps,
cv2.getEstimatorParamMaps)
}
+ test("read/write: CrossValidator with nested estimator") {
+ val ova = new OneVsRest().setClassifier(new LogisticRegression)
+ val evaluator = new MulticlassClassificationEvaluator()
+ .setMetricName("accuracy")
+ val classifier1 = new LogisticRegression().setRegParam(2.0)
+ val classifier2 = new LogisticRegression().setRegParam(3.0)
+ // params that are not JSON serializable must inherit from Params
+ val paramMaps = new ParamGridBuilder()
+ .addGrid(ova.classifier, Array(classifier1, classifier2))
+ .build()
+ val cv = new CrossValidator()
+ .setEstimator(ova)
+ .setEvaluator(evaluator)
+ .setNumFolds(20)
+ .setEstimatorParamMaps(paramMaps)
--- End diff --
Same for the TrainValidationSplitSuite
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