Improve AUC-PR Calculation

Description

Improve our AUC-PR calculation which currently uses linear interpolation. The following article states that in the "PR space it is incorrect to linearly interpolate between points" (see: http://pages.cs.wisc.edu/~jdavis/davisgoadrichcamera2.pdf). XGBoost's AUC-PR implementation is more sophisticated (see: https://github.com/dmlc/xgboost/blob/2abe69d7744b4f695ffcf89a6add16233bfc7986/src/metric/rank_metric.cc#L446)

Assignee

Veronika Maurerov√°

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Reporter

Megan Kurka

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