The wrong and right way to approximate Area Under Precision-Recall Curve (AUPRC)

There are many ways to summarize the AUPRC, but not all are of equal merit

The area under Precision-Recall (PR) curve (AUPRC) is a single number that summarizes the information in the PR curve. There are many ways to estimate its enclosed area, but not all are of equal merit. This article attempts to analyze two common ways to approximate AUPRC: either using the trapezoidal rule or using the average precision score, and why …

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