Backport implementation of precision-recall gain AUC (Keras PR #21370) #851
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Add PRGAIN enum for AUC metric types
Add implementation of precision-recall gain AUC
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Backport of keras-team/keras#21370
We implement the AUC metric described in https://research-information.bris.ac.uk/files/72164009/5867_precision_recall_gain_curves_pr_analysis_done_right.pdf
This metric is intended to help classifiers when the true label fraction is far from balanced (0.5) and to be independent of the true label fraction, allowing to compare values between reweighted models, unlike the original PR curve.