Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/7884#discussion_r39474415
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/classification/LogisticRegression.scala
---
@@ -501,22 +529,27 @@ class LogisticRegressionModel private[ml] (
* corresponding joint dataset.
*/
private[classification] class MultiClassSummarizer extends Serializable {
- private val distinctMap = new mutable.HashMap[Int, Long]
+ private val distinctMap = new mutable.HashMap[Int, Double]
private var totalInvalidCnt: Long = 0L
/**
* Add a new label into this MultilabelSummarizer, and update the
distinct map.
* @param label The label for this data point.
+ * @param weight The weight of this instances.
* @return This MultilabelSummarizer
*/
- def add(label: Double): this.type = {
+ def add(label: Double, weight: Double = 1.0): this.type = {
+ require(weight >= 0.0, s"instance weight, ${weight} has to be >= 0.0")
+
+ if (weight == 0.0) return this
+
if (label - label.toInt != 0.0 || label < 0) {
totalInvalidCnt += 1
this
}
else {
- val counts: Long = distinctMap.getOrElse(label.toInt, 0L)
- distinctMap.put(label.toInt, counts + 1)
+ val counts: Double = distinctMap.getOrElse(label.toInt, 0.0)
--- End diff --
should keep `count` and add `weightSum`, both of which are useful
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