Quantile discretizer benchmark (#135)

QuantileDiscretizer benchmark

src/main/resources/com/databricks/spark/sql/perf/mllib/config/mllib-small.yaml

@@ -97,6 +97,11 @@ benchmarks:
     params:
       numExamples: 100
       featureArity: 10
+  - name: feature.QuantileDiscretizer
+    params:
+      numExamples: 100
+      bucketizerNumBuckets: 2
+      relativeError: 0.001
   - name: feature.StringIndexer
     params:
       numExamples: 100

src/main/scala/com/databricks/spark/sql/perf/mllib/feature/QuantileDiscretizer.scala

@@ -0,0 +1,37 @@
+package com.databricks.spark.sql.perf.mllib.feature
+
+import org.apache.spark.ml
+import org.apache.spark.ml.linalg.Vector
+import org.apache.spark.ml.PipelineStage
+import org.apache.spark.sql._
+
+import com.databricks.spark.sql.perf.mllib.OptionImplicits._
+import com.databricks.spark.sql.perf.mllib.data.DataGenerator
+import com.databricks.spark.sql.perf.mllib.{BenchmarkAlgorithm, MLBenchContext, TestFromTraining}
+
+/** Object for testing QuantileDiscretizer performance */
+object QuantileDiscretizer extends BenchmarkAlgorithm with TestFromTraining with UnaryTransformer {
+
+  override def trainingDataSet(ctx: MLBenchContext): DataFrame = {
+    import ctx.params._
+    import ctx.sqlContext.implicits._
+
+    DataGenerator.generateContinuousFeatures(
+      ctx.sqlContext,
+      numExamples,
+      ctx.seed(),
+      numPartitions,
+      1
+    ).rdd.map { case Row(vec: Vector) =>
+      vec(0) // extract the single generated double value for each row
+    }.toDF(inputCol)
+  }
+
+  override def getPipelineStage(ctx: MLBenchContext): PipelineStage = {
+    import ctx.params._
+    new ml.feature.QuantileDiscretizer()
+      .setInputCol(inputCol)
+      .setNumBuckets(bucketizerNumBuckets)
+      .setRelativeError(relativeError)
+  }
+}

src/main/scala/com/databricks/spark/sql/perf/results.scala

@@ -137,6 +137,7 @@ class MLParams(
     val numUsers: Option[Int] = None,
     val optimizer: Option[String] = None,
     val regParam: Option[Double] = None,
+    val relativeError: Option[Double] = Some(0.001),
     val rank: Option[Int] = None,
     val smoothing: Option[Double] = None,
     val tol: Option[Double] = None,
@@ -178,21 +179,42 @@ class MLParams(
       numInputCols: Option[Int] = numInputCols,
       numItems: Option[Int] = numItems,
       numUsers: Option[Int] = numUsers,
-      vocabSize: Option[Int] = vocabSize,
       optimizer: Option[String] = optimizer,
       regParam: Option[Double] = regParam,
+      relativeError: Option[Double] = relativeError,
       rank: Option[Int] = rank,
       smoothing: Option[Double] = smoothing,
-      tol: Option[Double] = tol): MLParams = {
-    new MLParams(randomSeed = randomSeed, numExamples = numExamples,
-      numTestExamples = numTestExamples, numPartitions = numPartitions,
-      bucketizerNumBuckets = bucketizerNumBuckets, depth = depth, docLength = docLength,
-      elasticNetParam = elasticNetParam, family = family, featureArity = featureArity,
-      itemSetSize = itemSetSize, k = k, link = link, maxIter = maxIter,
-      numClasses = numClasses, numFeatures = numFeatures, numHashTables = numHashTables,
-      numInputCols = numInputCols, numItems = numItems, numSynonymsToFind = numSynonymsToFind,
-      numUsers = numUsers, optimizer = optimizer, regParam = regParam,
-      rank = rank, smoothing = smoothing, tol = tol, vocabSize = vocabSize)
+      tol: Option[Double] = tol,
+      vocabSize: Option[Int] = vocabSize): MLParams = {
+    new MLParams(
+      randomSeed = randomSeed,
+      numExamples = numExamples,
+      numTestExamples = numTestExamples,
+      numPartitions = numPartitions,
+      bucketizerNumBuckets = bucketizerNumBuckets,
+      depth = depth,
+      docLength = docLength,
+      elasticNetParam = elasticNetParam,
+      family = family,
+      featureArity = featureArity,
+      itemSetSize = itemSetSize,
+      k = k,
+      link = link,
+      maxIter = maxIter,
+      numClasses = numClasses,
+      numFeatures = numFeatures,
+      numHashTables = numHashTables,
+      numSynonymsToFind = numSynonymsToFind,
+      numInputCols = numInputCols,
+      numItems = numItems,
+      numUsers = numUsers,
+      optimizer = optimizer,
+      regParam = regParam,
+      relativeError = relativeError,
+      rank = rank,
+      smoothing = smoothing,
+      tol = tol,
+      vocabSize = vocabSize)
   }
 }