Github user yu-iskw commented on the pull request:
https://github.com/apache/spark/pull/8729#issuecomment-150673626
You don't need to include it. You should fix style errors which are pointed
out by `dev/lint-scala`. According to the Jenkins result, there are some `White
space at end of line` errors.
This is a result of `grep` in your branch, checking out it to my local
computer.
```
> grep -n -iRe "\s\s*$" mllib/ | grep "\.scala"
mllib//src/main/scala/org/apache/spark/ml/regression/DecisionTreeRegressor.scala:59:
@Since("1.4.0")
mllib//src/main/scala/org/apache/spark/ml/regression/GBTRegressor.scala:184:
mllib//src/main/scala/org/apache/spark/ml/regression/GBTRegressor.scala:201:
mllib//src/main/scala/org/apache/spark/ml/regression/GBTRegressor.scala:206:
```
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