Github user srowen commented on a diff in the pull request:

    https://github.com/apache/spark/pull/18872#discussion_r132647596
  
    --- Diff: 
mllib/src/test/scala/org/apache/spark/ml/source/libsvm/LibSVMRelationSuite.scala
 ---
    @@ -126,6 +130,29 @@ class LibSVMRelationSuite extends SparkFunSuite with 
MLlibTestSparkContext {
         }
       }
     
    +  test("write libsvm data from scratch and read it again") {
    +    val rawData = new java.util.ArrayList[Row]()
    +    rawData.add(Row(1.0, Vectors.sparse(3, Seq((0, 2.0), (1, 3.0)))))
    +    rawData.add(Row(4.0, Vectors.sparse(3, Seq((0, 5.0), (2, 6.0)))))
    +                   
    --- End diff --
    
    Subtle: it didn't like the whitespace on this line


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