[SPARK-21526] [MLlib] Add support to ML LogisticRegression for setting initial model

[JohnHBrock]

What changes were proposed in this pull request?

• Change ML LogisticRegression setInitialModel from private to public.
• Add getInitialModel method.

How was this patch tested?

Running ./dev/run-tests.

[JohnHBrock]

This contribution is my original work and I license the work to the project under the project’s open source license.

[MLnick]

Hi there, thanks for this. However, please see #18610 and related JIRA tickets. The solution is slightly more complex and needs to be done in a more generic way. I suggest that this be updated once agreement on #18610 is reached, and makes use of the shared trait in that PR, etc.

[WeichenXu123]

Yes pls pending until #18610 is done.

[JohnHBrock]

#18610 seems to be stuck in purgatory. Is there any option other than waiting for that PR to be resolved? This feels like the perfect being the enemy of the good.

[sethah]

I actually completely agree about perfect being the enemy of good in this case. We should provide something workable that can be safely modified in the future if needed. Still, this needs to be done in the other PR #18610, so I suggest providing feedback and code review on that one until it gets merged, then we can revisit here. Thanks!

[AmplabJenkins]

Can one of the admins verify this patch?

[github-actions]

We're closing this PR because it hasn't been updated in a while. This isn't a judgement on the merit of the PR in any way. It's just a way of keeping the PR queue manageable.
If you'd like to revive this PR, please reopen it and ask a committer to remove the Stale tag!