Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/20070#discussion_r158744230
--- Diff:
examples/src/main/scala/org/apache/spark/examples/ml/CorrelationExample.scala
---
@@ -51,10 +51,10 @@ object CorrelationExample {
val df = data.map(Tuple1.apply).toDF("features")
val Row(coeff1: Matrix) = Correlation.corr(df, "features").head
- println("Pearson correlation matrix:\n" + coeff1.toString)
+ println(s"Pearson correlation matrix:\n ${coeff1.toString}")
--- End diff --
Another thing we could improve: `.toString` is redundant here I believe
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