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inverse_transform Xt argument consistency #27654

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williambdean opened this issue Oct 24, 2023 · 6 comments · Fixed by #28756
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inverse_transform Xt argument consistency #27654

williambdean opened this issue Oct 24, 2023 · 6 comments · Fixed by #28756
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@williambdean
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Describe the issue linked to the documentation

Some of the inverse_transform methods take Xt as an argument whereas others take X. Is there are reason for the differences in the names?

Noting the cases here: https://github.com/search?q=repo%3Ascikit-learn%2Fscikit-learn%20%22def%20inverse_transform%22&type=code

Suggest a potential alternative/fix

Stick to Xt in all cases
@williambdean williambdean added Documentation Needs Triage Issue requires triage labels Oct 24, 2023
@fparisio
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fparisio commented Nov 1, 2023

@wd60622 JTBC you recommend refactoring all inverse_transform args X --> Xt?

@williambdean
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williambdean commented Nov 1, 2023 •
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@wd60622 JTBC you recommend refactoring all inverse_transform args X --> Xt?

Yes. I read Xt as the result of something.transform(X), so X = something.inverse_transform(Xt). However, a simple renaming could break a lot of code. But it would provide a standard interface for the inverse_transform method.

# Has Xt arg
pipeline = make_pipeline(StandardScaler())
Xt = pipeline.fit_transform(X)
X_again = pipeline.inverse_transform(Xt=Xt)

# inverse_transform takes X instead of Xt
transformer = StandardScaler()
Xt = transformer.fit_transform(X)
X_again = transformer.inverse_transform(Xt=Xt)
# TypeError: inverse_transform() got an unexpected keyword argument 'Xt'

@glemaitre
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I think that we got a similar refactoring to replace Y by y for consistency (#27666). So I am fine with carrying on this deprecation.

@glemaitre glemaitre added API and removed Needs Triage Issue requires triage Documentation labels Nov 3, 2023
@williambdean
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I think that we got a similar refactoring to replace Y by y for consistency (#27666). So I am fine with carrying on this deprecation.

Nice, thanks for clarifying. If I can help out in anyway, I'll gladly make a PR

@glemaitre
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Feel free to make a PR. You can check how this is handled in the other PR to know how to deprecate Xt without throwing too many warnings.

@williambdean williambdean mentioned this issue Apr 2, 2024
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@lorentzenchr
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Conclusion in #28756 (comment) and following comments:
We want the argument if inverse transform to be X and make it happen by the standard deprecation (deprecate in version 1.x, remove deprecation and carry out the final change in 1.x+2).

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API Standardize X as inverse_transform input parameter williambdean/scikit-learn
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@glemaitre @lorentzenchr @williambdean @fparisio