Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/18581#discussion_r134813986 --- 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) + lineSeparator.foreach(s => require(s.nonEmpty, s"'$LINE_SEPARATOR' cannot be an empty string.")) } private[libsvm] object LibSVMOptions { val NUM_FEATURES = "numFeatures" val VECTOR_TYPE = "vectorType" val DENSE_VECTOR_TYPE = "dense" val SPARSE_VECTOR_TYPE = "sparse" + val LINE_SEPARATOR = "lineSep" --- End diff -- Please use the full name.
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