Github user dbtsai commented on the issue:
https://github.com/apache/spark/pull/14717
If `SharedParamsCodeGen.scala` is changed, you need to manually run
```scala
build/sbt "mllib/runMain
org.apache.spark.ml.param.shared.SharedParamsCodeGen"
```
to generate and update the `sharedParams.scala` file.
I think we should do compile time code-gen for this using macros instead of
running the script to update the code. Can you create a followup JIRA, and see
if anyone is interested in working on it?
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