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

    https://github.com/apache/spark/pull/18581#discussion_r126585768
  
    --- Diff: 
mllib/src/main/scala/org/apache/spark/ml/source/libsvm/LibSVMOptions.scala ---
    @@ -41,11 +41,15 @@ private[libsvm] class LibSVMOptions(@transient private 
val parameters: CaseInsen
         case o => throw new IllegalArgumentException(s"Invalid value `$o` for 
parameter " +
           s"`$VECTOR_TYPE`. Expected types are `sparse` and `dense`.")
       }
    +
    +  val lineSeparator: Option[String] = parameters.get(LINE_SEPARATOR)
    --- End diff --
    
    Could we put this option in a single place for these formats? I feel 
putting this option in each format looks a little messy...


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