Github user sethah commented on a diff in the pull request:
https://github.com/apache/spark/pull/16441#discussion_r95284176
--- Diff:
mllib/src/test/scala/org/apache/spark/ml/classification/GBTClassifierSuite.scala
---
@@ -66,10 +70,79 @@ class GBTClassifierSuite extends SparkFunSuite with
MLlibTestSparkContext
ParamsSuite.checkParams(new GBTClassifier)
val model = new GBTClassificationModel("gbtc",
Array(new DecisionTreeRegressionModel("dtr", new LeafNode(0.0, 0.0,
null), 1)),
- Array(1.0), 1)
+ Array(1.0), 1, 2)
ParamsSuite.checkParams(model)
}
+ test("GBTClassifier: Predictor, Classifier methods") {
+ val rawPredictionCol = "rawPrediction"
+ val predictionCol = "prediction"
+ val labelCol = "label"
+ val featuresCol = "features"
+ val probabilityCol = "probability"
+
+ val gbt = new GBTClassifier().setSeed(123)
+ val trainingDataset = trainData.toDF(labelCol, featuresCol)
+ val gbtModel = gbt.fit(trainingDataset)
+ assert(gbtModel.numClasses === 2)
+ val numFeatures =
trainingDataset.select(featuresCol).first().getAs[Vector](0).size
+ assert(gbtModel.numFeatures === numFeatures)
+
+ val blas = BLAS.getInstance()
+
+ val validationDataset = validationData.toDF(labelCol, featuresCol)
+ val results = gbtModel.transform(validationDataset)
+ // check that raw prediction is tree predictions dot tree weights
+ results.select(rawPredictionCol, featuresCol).collect().foreach {
+ case Row(raw: Vector, features: Vector) =>
+ assert(raw.size === 2)
+ val treePredictions =
gbtModel.trees.map(_.rootNode.predictImpl(features).prediction)
+ val prediction = blas.ddot(gbtModel.numTrees, treePredictions, 1,
gbtModel.treeWeights, 1)
+ assert(raw ~== Vectors.dense(-prediction, prediction) relTol eps)
+ }
+
+ // Compare rawPrediction with probability
+ results.select(rawPredictionCol, probabilityCol).collect().foreach {
+ case Row(raw: Vector, prob: Vector) =>
+ assert(raw.size === 2)
+ assert(prob.size === 2)
+ val prodFromRaw = raw.toDense.values.map(value => 1 / (1 +
math.exp(-2 * value)))
+ assert(prob(0) ~== prodFromRaw(0) relTol eps)
--- End diff --
check that `prob(0) + prob(1) ~== 1.0 absTol 1e-8`
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