Weka Genetic Search & Evolutionary Search

Hi All,

I was wondering if anyone knew what fitness function these two attribute selection algorithms used when using CfsSubset Eval. The description is as follows: 

Evaluates the worth of a subset of attributes by considering the individual predictive ability of each feature along with the degree of redundancy between them.

Subsets of features that are highly correlated with the class while having low intercorrelation are preferred.

I was wondering what specific calculation was used for this though, as a default.

Thanks,
Warren
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