Hello
While working on matrix factorization with missing values
<https://github.com/scikit-learn/scikit-learn/pull/4237> I faced a circular
import issue (
https://travis-ci.org/scikit-learn/scikit-learn/jobs/50276638#L1362).
The problem is that I want to add a new imputer, which should reside in
.preprocessing.imputation and use factorizer from decomposition. As you can
see in Travis, this leads to circular import, so I should not import
decomposition in preprocessing. That means I need to move factorization
somewhere.
So, the question is: where can I move it? The factorization core belongs to
decomposition (NMF is already there). I was thinking about the "root"
(where lda, qda, cross_validation and others are located), but not sure if
polluting it is a good idea.
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