[scikit-learn] imbalanced classes: class_weight

[Joel Nothman]

We don't usually do any postprocessing for class weight (although there is
an open issue:).

In the second taxonomy, I'd say Data Pre-processing ("weighting the data
space"), but maybe there are exceptions in some estimators.

The classification in the first taxonomy is correct, IMO.

In the third, perhaps "Algorithm-level"
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