Github user feynmanliang commented on a diff in the pull request:
https://github.com/apache/spark/pull/8507#discussion_r38446219
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/clustering/GaussianMixtureModel.scala
---
@@ -159,19 +159,25 @@ object GaussianMixtureModel extends
Loader[GaussianMixtureModel] {
// Create Parquet data.
val dataArray = Array.tabulate(weights.length) { i =>
- Data(weights(i), gaussians(i).mu, gaussians(i).sigma)
+ Row(weights(i), gaussians(i).mu, gaussians(i).sigma)
}
- sc.parallelize(dataArray,
1).toDF().write.parquet(Loader.dataPath(path))
+ val dataRDD: RDD[Row] = sc.parallelize(dataArray, 1)
+
+ sqlContext.createDataFrame(dataRDD,
schema).write.parquet(Loader.dataPath(path))
}
+ private val schema = StructType(
+ StructField("weight", DoubleType, nullable = false)::
+ StructField("mu", new VectorUDT, nullable = false)::
+ StructField("sigma", new MatrixUDT, nullable = false)::Nil)
def load(sc: SparkContext, path: String): GaussianMixtureModel = {
val dataPath = Loader.dataPath(path)
val sqlContext = new SQLContext(sc)
val dataFrame = sqlContext.read.parquet(dataPath)
- val dataArray = dataFrame.select("weight", "mu", "sigma").collect()
--- End diff --
Good idea
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