Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/21465
**[Test build #99408 has
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/99408/testReport)**
for PR 21465 at commit
[`c0fcbb3`](https://github.com/apache/spark/commit/c0fcbb397ae3c954092e461bbabf2b8f8cf85386).
* This patch **fails Python style tests**.
* This patch merges cleanly.
* This patch adds the following public classes _(experimental)_:
* `class GBTClassifierParams(GBTParams, HasVarianceImpurity):`
* `class GBTClassifier(JavaEstimator, HasFeaturesCol, HasLabelCol,
HasPredictionCol,`
* `class HasVarianceImpurity(Params):`
* `class TreeRegressorParams(HasVarianceImpurity):`
* `class GBTRegressorParams(GBTParams, TreeRegressorParams):`
* `class GBTRegressor(JavaEstimator, HasFeaturesCol, HasLabelCol,
HasPredictionCol,`
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