zhengruifeng commented on a change in pull request #26413:
[SPARK-16872][ML][PYSPARK] Impl Gaussian Naive Bayes Classifier
URL: https://github.com/apache/spark/pull/26413#discussion_r344430184
##########
File path:
mllib/src/main/scala/org/apache/spark/ml/classification/NaiveBayes.scala
##########
@@ -396,15 +545,29 @@ object NaiveBayesModel extends
MLReadable[NaiveBayesModel] {
private val className = classOf[NaiveBayesModel].getName
override def load(path: String): NaiveBayesModel = {
+ implicit val format = DefaultFormats
val metadata = DefaultParamsReader.loadMetadata(path, sc, className)
+ val (major, minor) =
VersionUtils.majorMinorVersion(metadata.sparkVersion)
+ val modelTypeJson = metadata.getParamValue("modelType")
+ val modelType = Param.jsonDecode[String](compact(render(modelTypeJson)))
val dataPath = new Path(path, "data").toString
val data = sparkSession.read.parquet(dataPath)
val vecConverted = MLUtils.convertVectorColumnsToML(data, "pi")
- val Row(pi: Vector, theta: Matrix) =
MLUtils.convertMatrixColumnsToML(vecConverted, "theta")
- .select("pi", "theta")
- .head()
- val model = new NaiveBayesModel(metadata.uid, pi, theta)
+
+ val model = if (major.toInt < 3 || modelType != NaiveBayes.Gaussian) {
Review comment:
yes, it is also used in:
[LogisticRegressionModel](https://github.com/apache/spark/blob/5853e8b3301fd7b0bff721d5a47139afb17bfd2b/mllib/src/main/scala/org/apache/spark/ml/classification/LogisticRegression.scala#L1229)
[HashingTF](https://github.com/apache/spark/blob/4664a082c2c7ac989e818958c465c72833d3ccfe/mllib/src/main/scala/org/apache/spark/ml/feature/HashingTF.scala#L147)
[LinearRegressionModel](https://github.com/apache/spark/blob/5853e8b3301fd7b0bff721d5a47139afb17bfd2b/mllib/src/main/scala/org/apache/spark/ml/regression/LinearRegression.scala#L769)
and so on
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