SparkQA commented on issue #25757: [SPARK-29052][DOCS][ML][PYTHON][CORE][R][SQL][SS] Create a Migration Guide tap in Spark documentation URL: https://github.com/apache/spark/pull/25757#issuecomment-530331084 **[Test build #110475 has finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/110475/testReport)** for PR 25757 at commit [`7a8d639`](https://github.com/apache/spark/commit/7a8d63922d6654c5ab515967a58d9070a64d4407). * This patch passes all tests. * This patch merges cleanly. * This patch adds the following public classes _(experimental)_: * ` * *(Breaking change)* The `apply` and `copy` methods for the case class [`BoostingStrategy`](api/scala/index.html#org.apache.spark.mllib.tree.configuration.BoostingStrategy) have been changed because of a modification to the case class fields. This could be an issue for users who use `BoostingStrategy` to set GBT parameters.` * `* *(Breaking change)* The return value of [`LDA.run`](api/scala/index.html#org.apache.spark.mllib.clustering.LDA) has changed. It now returns an abstract class `LDAModel` instead of the concrete class `DistributedLDAModel`. The object of type `LDAModel` can still be cast to the appropriate concrete type, which depends on the optimization algorithm.` * ` * In `DecisionTree`, the deprecated class method `train` has been removed. (The object/static `train` methods remain.)` * `* The `scoreCol` output column (with default value \"score\") was renamed to be `probabilityCol` (with default value \"probability\"). The type was originally `Double` (for the probability of class 1.0), but it is now `Vector` (for the probability of each class, to support multiclass classification in the future).` * ` - In Spark 3.0, the deprecated `HiveContext` class has been removed. Use `SparkSession.builder.enableHiveSupport()` instead.`
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