Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/19122
**[Test build #81386 has
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/81386/testReport)**
for PR 19122 at commit
[`57cf534`](https://github.com/apache/spark/commit/57cf53473e5bfb75095b0e519457dbdc973f3300).
* This patch passes all tests.
* This patch merges cleanly.
* This patch adds the following public classes _(experimental)_:
* `class HasParallelism(Params):`
* `class CrossValidator(Estimator, ValidatorParams, HasParallelism,
MLReadable, MLWritable):`
* `class TrainValidationSplit(Estimator, ValidatorParams, HasParallelism,
MLReadable, MLWritable):`
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