8000 AdaBoost: allow base_estimator=None by markotoplak · Pull Request #26242 · scikit-learn/scikit-learn · GitHub
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AdaBoost: allow base_estimator=None#26242

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betatim merged 4 commits intoscikit-learn:mainfrom
markotoplak:fix-adaboost-base_estimator-deprecation
May 10, 2023
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AdaBoost: allow base_estimator=None#26242
betatim merged 4 commits intoscikit-learn:mainfrom
markotoplak:fix-adaboost-base_estimator-deprecation

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@markotoplak markotoplak commented Apr 21, 2023

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Fixes #26241.

What does this implement/fix? Explain your changes.

To ensure that the (deprecated) explicit base_estimator=None doesn't stop working, add a (likely forgotten) None to a list allowed values in _parameter_constraints. Everything else already seems to be setup properly.

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adrinjalali commented Apr 21, 2023

This would need also a test, and an item in the changelog.

@markotoplak markotoplak force-pushed the fix-adaboost-base_estimator-deprecation branch 2 times, most recently from d42c7ef to c999b14 Compare May 8, 2023 11:17
@markotoplak markotoplak force-pushed the fix-adaboost-base_estimator-deprecation branch from c999b14 to f9c4ce3 Compare May 8, 2023 12:58
@markotoplak markotoplak changed the title AdaBoost: allow base_estimator=None. AdaBoost: allow base_estimator=None May 8, 2023
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markotoplak commented May 8, 2023

@adrinjalali, thanks for the review.

I added a test and modified _validate_estimator accordingly: now the deprecation message is also shown at base_estimator=None, as it is my opinion should, because this setting is explicit (the default is "deprecated", so there are no conflicts).

Also, there still remains a small bug in _validate_estimator: user code where estimator is not None and base_estimator is None is now allowed, but should not be (base_estimator=None is always an explicit setting). But fixing it could create problems, because it could raise an exception for code that is currently valid. On the other hand such code will crash after 1.4 anyway when the deprecated parameter is be removed. I opted not to change that part for now, but can easily add a commit that does.

adrinjalali
adrinjalali approved these changes May 8, 2023
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Thanks, this LGTM.

On the other hand such code will crash after 1.4 anyway when the deprecated parameter is be removed. I opted not to change that part for now, but can easily add a commit that does.

Yeah, we can just leave it alone, it'll fix itself when we remove support for base_estimator

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betatim approved these changes May 9, 2023
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LGTM modulo those trailing underscores.

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adrinjalali commented May 9, 2023

LGTM modulo those trailing underscores.

@betatim which trailing underscores?

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markotoplak commented May 9, 2023

Trailing underscores in the changelog were removed in the last commit. Sorry.

@betatim betatim merged commit 72a6049 into scikit-learn:main May 10, 2023
@markotoplak markotoplak mentioned this pull request Sep 21, 2023
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REDVM pushed a commit to REDVM/scikit-learn that referenced this pull request Nov 16, 2023
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AdaBoost: allow base_estimator=None (scikit-learn#26242)
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AdaBoost: deprecation of "base_estimator" does not handle "base_estimator=None" setting properly

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