Github user sethah commented on a diff in the pull request:
https://github.com/apache/spark/pull/17078#discussion_r103239934
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/classification/LogisticRegression.scala
---
@@ -1447,7 +1447,7 @@ private class LogisticAggregator(
label: Double): Unit = {
val localFeaturesStd = bcFeaturesStd.value
- val localCoefficients = bcCoefficients.value
+ val localCoefficients = bcCoefficients.value.toArray
--- End diff --
Another thought is that by tagging the class member as `@transient lazy
val` we are at least making this hidden problem more explicit. I think using
the transient method makes it a bit less likely that someone will come along
and make a change in the future that serializes the coefficients. I'll plan to
update it here with the transient tag then.
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