Github user mengxr commented on a diff in the pull request: https://github.com/apache/spark/pull/1673#discussion_r15681460 --- Diff: examples/src/main/scala/org/apache/spark/examples/mllib/DecisionTreeRunner.scala --- @@ -100,16 +109,57 @@ object DecisionTreeRunner { } def run(params: Params) { + val conf = new SparkConf().setAppName("DecisionTreeRunner") val sc = new SparkContext(conf) // Load training data and cache it. - val examples = MLUtils.loadLabeledPoints(sc, params.input).cache() + val origExamples = params.dataFormat match { + case "dense" => MLUtils.loadLabeledPoints(sc, params.input).cache() + case "libsvm" => MLUtils.loadLibSVMFile(sc, params.input).cache() + } + // For classification, re-index classes if needed. + val (examples, numClasses) = params.algo match { + case Classification => { + // classCounts: class --> # examples in class + val classCounts = origExamples.map(_.label).countByValue() + val sortedClasses = classCounts.keys.toList.sorted + val numClasses = classCounts.size + // classIndexMap: class --> index in 0,...,numClasses-1 + val classIndexMap = { + if (classCounts.keySet != Set(0.0, 1.0)) { + sortedClasses.zipWithIndex.toMap + } else { + Map[Double, Int]() + } + } + val examples = { + if (classIndexMap.isEmpty) { + origExamples + } else { + origExamples.map(lp => LabeledPoint(classIndexMap(lp.label), lp.features)) + } + } + val numExamples = examples.count() + println(s"numClasses = $numClasses.") --- End diff -- This is on the driver node. It should be okay to use `println`.
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