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Poster
Stochastic Optimization of Areas Under Precision-Recall Curves with Provable Convergence
Qi Qi · Youzhi Luo · Zhao Xu · Shuiwang Ji · Tianbao Yang

Tue Dec 07 08:30 AM -- 10:00 AM (PST) @ None #None

Areas under ROC (AUROC) and precision-recall curves (AUPRC) are common metrics for evaluating classification performance for imbalanced problems. Compared with AUROC, AUPRC is a more appropriate metric for highly imbalanced datasets. While stochastic optimization of AUROC has been studied extensively, principled stochastic optimization of AUPRC has been rarely explored. In this work, we propose a principled technical method to optimize AUPRC for deep learning. Our approach is based on maximizing the averaged precision (AP), which is an unbiased point estimator of AUPRC. We cast the objective into a sum of dependent compositional functions with inner functions dependent on random variables of the outer level. We propose efficient adaptive and non-adaptive stochastic algorithms named SOAP with provable convergence guarantee under mild conditions by leveraging recent advances in stochastic compositional optimization. Extensive experimental results on image and graph datasets demonstrate that our proposed method outperforms prior methods on imbalanced problems in terms of AUPRC. To the best of our knowledge, our work represents the first attempt to optimize AUPRC with provable convergence. The SOAP has been implemented in the libAUC library at https://libauc.org/.

Author Information

Qi Qi (University of Iowa)
Youzhi Luo (Texas A&M University)
Zhao Xu (Texas A&M University)
Shuiwang Ji (Texas A&M University)
Tianbao Yang (The University of Iowa)

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