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Summary: Pull Request resolved: #265 Average Precision (AP) summarizes a precision-recall curve as the weighted mean of precisions achieved at each threshold, with the increase in recall from the previous threshold used as the weight. See AP formal definition (https://scikit-learn.org/stable/modules/generated/sklearn.metrics.average_precision_score.html). Mean Average Precision is an average of AP over different classes. In this diff, we implement Mean Average Precision meter that is useful for multi-label classification task. Differential Revision: D18715190 fbshipit-source-id: 83cffde189d4e2f100523c1d33353d85fd4815e7
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