Github user facaiy commented on a diff in the pull request:
https://github.com/apache/spark/pull/17503#discussion_r113360409
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/tree/configuration/Strategy.scala
---
@@ -61,6 +61,8 @@ import org.apache.spark.mllib.tree.impurity.{Entropy,
Gini, Impurity, Variance}
* @param subsamplingRate Fraction of the training data used for learning
decision tree.
* @param useNodeIdCache If this is true, instead of passing trees to
executors, the algorithm will
* maintain a separate RDD of node Id cache for each
row.
+ * @param canMergeChildren Merge pairs of leaf nodes of the same parent
which
--- End diff --
A new parameter is added in Strategy class, which fails Mima tests. How to
deal with it?
```bash
[error] * synthetic method <init>$default$13()Int in object
org.apache.spark.mllib.tree.configuration.Strategy has a different result type
in current version, where it is Boolean rather than Int
```
[see failed
logs](https://amplab.cs.berkeley.edu/jenkins/job/NewSparkPullRequestBuilder/3675/consoleFull)
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