8000 Can't instantiate pipeline with placeholder to search in GridSearchCV · Issue #12335 · scikit-learn/scikit-learn · GitHub
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Can't instantiate pipeline with placeholder to search in GridSearchCV #12335
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Can't instantiate pipeline with placeholder to search in GridSearchCV#12335
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module:pipeline
@amueller

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@amueller
amueller
opened on < 594B !-- -->Oct 9, 2018

A cosmetic complaint:
It's not possible to instantiate a pipeline with a placeholder like in #12272 and grid-search the final estimator. If the final estimator is None, there is no score method and so GridSearchCV refuses to run.
I'm not sure if this is worth fixing or how to most elegantly fix it, but it's a bit ugly.

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