Hi,

I was just wondering why there’s no support for the average per-class accuracy 
in the scorer functions (if I am not overlooking something).
E.g., we have 'f1_macro', 'f1_micro', 'f1_samples', ‘f1_weighted’ but I didn’t 
see a ‘accuracy_macro’, i.e., 
(acc.class_1 + acc.class_2 + … + acc.class_n) / n

Would you discourage its usage (in favor of other metrics in imbalanced class 
problems) or was it simply not implemented, yet?

Best,
Sebastian
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