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[SPARK-11343] [ML] Documentation of float and double prediction/label columns in RegressionEvaluator #9598

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[SPARK-11343] [ML] Documentation of float and double prediction/label columns in RegressionEvaluator #9598

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8c13de2
added message to require
Nov 10, 2015
c83588a
added message to require
Nov 10, 2015
2ccd177
fixed Scala style errors
Dec 8, 2015
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9 changes: 7 additions & 2 deletions mllib/src/main/scala/org/apache/spark/ml/evaluation/RegressionEvaluator.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -73,10 +73,15 @@ final class RegressionEvaluator @Since("1.4.0") (@Since("1.4.0") override val ui
@Since("1.4.0")
override def evaluate(dataset: DataFrame): Double = {
val schema = dataset.schema
val predictionColName = $(predictionCol)
val predictionType = schema($(predictionCol)).dataType
require(predictionType == FloatType || predictionType == DoubleType)
require(predictionType == FloatType || predictionType == DoubleType,
s"Prediction column $predictionColName must be of type float or double, " +
s" but not $predictionType")
val labelColName = $(labelCol)
val labelType = schema($(labelCol)).dataType
require(labelType == FloatType || labelType == DoubleType)
require(labelType == FloatType || labelType == DoubleType,
s"Label column $labelColName must be of type float or double, but not $labelType")

val predictionAndLabels = dataset
.select(col($(predictionCol)).cast(DoubleType), col($(labelCol)).cast(DoubleType))
Expand Down