Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/14597#discussion_r75307704
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/feature/ChiSqSelector.scala ---
@@ -189,11 +228,35 @@ class ChiSqSelector @Since("1.3.0") (
*/
@Since("1.3.0")
def fit(data: RDD[LabeledPoint]): ChiSqSelectorModel = {
- val indices = Statistics.chiSqTest(data)
- .zipWithIndex.sortBy { case (res, _) => -res.statistic }
- .take(numTopFeatures)
- .map { case (_, indices) => indices }
- .sorted
+ chiSqTestResult = Statistics.chiSqTest(data)
+ selectorType match {
+ case ChiSqSelectorType.KBest => selectKBest(numTopFeatures)
+ case ChiSqSelectorType.Percentile => selectPercentile(percentile)
+ case ChiSqSelectorType.Fpr => selectFpr(alpha)
+ case _ => throw new Exception("Unknown ChiSqSelector Type")
+ }
+ }
+
+ @Since("2.1.0")
+ def selectKBest(value: Int): ChiSqSelectorModel = {
--- End diff --
Yeah I assume that the selector is configured to fit a certain type of
model -- top k, percentile, etc -- and then produces that model, which is fixed
and of a certain type. So the type is selected as a parameter to the selector,
not the model. I think you were suggesting that is how other selectors work and
I think you're right.
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