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[RECALL, PRECISION] = <a href="vl_pr.html">VL_PR</a>(LABELS, SCORES) computes the
precision-recall (PR) curve. LABELS are the ground truth labels,
greather than zero for a positive sample and smaller than zero for
a negative one. SCORES are the scores of the samples obtained from
a classifier, where lager scores should correspond to positive
samples.
</p><p>
Samples are ranked 