8000 Pipeline with unfit and fit transformers · Issue #17375 · scikit-learn/scikit-learn · GitHub
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Pipeline with unfit and fit transformers #17375

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emilfilipov opened this issue May 28, 2020 · 1 comment
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Pipeline with unfit and fit transformers #17375

emilfilipov opened this issue May 28, 2020 · 1 comment
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@emilfilipov
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I couldn't find any examples of this anywhere so here goes.

What I have in mind is this:
I have an already fit custom transformer and i want to use it in a pipeline with a model that is not fit to the transformed data yet.

The goal is to keep the old fit transformer without refiting it to the new data and only fit the model, all combined in a Pipeline().
Currently, if I try to do that I get and error that the model has to be fit first.

The only alternative i can think of is transforming the data, training the model with it and then combining them into a Pipeline(). Or creating the Pipeline() and then fitting them step by step.
@glemaitre
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I am closing this because it is a duplicate to #8370
You are trying to freeze some estimators to disallow refitting.

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