Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/10976#discussion_r52694925
--- Diff: mllib/src/main/scala/org/apache/spark/ml/feature/Binarizer.scala
---
@@ -62,28 +65,57 @@ final class Binarizer(override val uid: String)
def setOutputCol(value: String): this.type = set(outputCol, value)
override def transform(dataset: DataFrame): DataFrame = {
- transformSchema(dataset.schema, logging = true)
+ val outputSchema = transformSchema(dataset.schema)
+ val schema = dataset.schema
+ val inputType = schema($(inputCol)).dataType
val td = $(threshold)
- val binarizer = udf { in: Double => if (in > td) 1.0 else 0.0 }
- val outputColName = $(outputCol)
- val metadata =
BinaryAttribute.defaultAttr.withName(outputColName).toMetadata()
- dataset.select(col("*"),
- binarizer(col($(inputCol))).as(outputColName, metadata))
+
+ val binarizerDouble = udf { in: Double => if (in > td) 1.0 else 0.0 }
+ val binarizerVector = udf { (data: Vector) =>
+ val indices = ArrayBuilder.make[Int]
+ val values = ArrayBuilder.make[Double]
+
+ data.foreachActive { (index, value) =>
+ indices += index
--- End diff --
Check `value > td` first and skip zeros:
~~~scala
if (value > td) {
indices += index
values += 1.0
}
~~~
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