Add reference for BalancedBaggingClassifier

[glemaitre]

I think we could add this reference for BalancedBaggingClassifier: Roughly BalancedBagging for Imbalanced Data

[glemaitre]

https://sci2s.ugr.es/keel/pdf/specific/congreso/hido_roughly_2008.pdf

[chkoar]

I do not think that we do what they describe in the paper.

[glemaitre]

Sorry it was more that we have to check (I just saw the name which look similar). I did not read the article yet.

[chkoar]

No worries. The fact is that BalancedBaggingClassifier might be a superset of existing methods that are reported in the literature, though.

[hayesall]

"A Review on Ensembles for the Class Imbalance Problem: Bagging-, Boosting-, and Hybrid-Based Approaches" discusses "Bagging-based Ensembles" toward the end of section 3. They distinguish between OverBagging, UnderBagging, UnderOverBagging, and IIVotes (a method based on the SPIDER sampler).

Since BalancedBaggingClassifier uses a RandomUnderSampler, this is probably closest to their description of "UnderBagging", which they reference from: "New Applications of Ensembles of Classifiers".

To @chkoar's point: changing the BalancedBaggingClassifier to pass a sampler as an argument might be a good generalization.

[glemaitre]

#808 Will solve this issue.