[GitHub] [spark] zhengruifeng commented on a change in pull request #30000: [SPARK-33111][ML] aft transform optimization

[GitBox <gi...@apache.org>]

zhengruifeng commented on a change in pull request #30000:
URL: https://github.com/apache/spark/pull/30000#discussion_r502999821



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File path: mllib/src/main/scala/org/apache/spark/ml/regression/AFTSurvivalRegression.scala
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@@ -421,9 +421,17 @@ class AFTSurvivalRegressionModel private[ml] (
     }
 
     if (hasQuantilesCol) {
-      val predictQuantilesUDF = udf { features: Vector => predictQuantiles(features)}
+      val baseQuantiles = $(quantileProbabilities)
+        .map(q => math.exp(math.log(-math.log1p(-q)) * scale))
+      val lambdaCol = if ($(predictionCol).nonEmpty) {

Review comment:
       if ($(predictionCol).nonEmpty), then `predictionColumns.head` is `predictUDF(col($(featuresCol))).as($(predictionCol), outputSchema($(predictionCol)).metadata)`, the predictionCol.




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