Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/12066#discussion_r61474754
--- Diff:
mllib/src/test/scala/org/apache/spark/ml/classification/NaiveBayesSuite.scala
---
@@ -193,6 +195,30 @@ class NaiveBayesSuite extends SparkFunSuite with
MLlibTestSparkContext with Defa
assert(expected.theta === actual.theta)
}
}
+
+ test("copy label column metadata to prediction column") {
+ val data = sc.parallelize(Seq((Vectors.dense(0.0), "a"),
(Vectors.dense(1.0), "b"),
+ (Vectors.dense(2.0), "c"), (Vectors.dense(3.0), "a"),
(Vectors.dense(4.0), "a")), 2)
+ var df = sqlContext.createDataFrame(data).toDF("features", "label")
+
+ val indexer = new StringIndexer()
+ .setInputCol("label")
+ .setOutputCol("labelIndex")
+ .fit(df)
+ df = indexer.transform(df)
+
+ val naiveBayes = new NaiveBayes().setLabelCol("labelIndex")
+ val naiveBayesModel = naiveBayes.fit(df)
+ df = naiveBayesModel.transform(df)
+
+ val schema = df.schema
+ val labelAttr =
Attribute.fromStructField(schema(naiveBayesModel.getLabelCol))
+ .asInstanceOf[NominalAttribute]
+ val predictionAttr =
Attribute.fromStructField(schema(naiveBayesModel.getPredictionCol))
+ .asInstanceOf[NominalAttribute]
+ assert(labelAttr.attrType === predictionAttr.attrType)
--- End diff --
Check that the "name" field matches predictionCol too
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