Li, Z., W. Min, J. Song, Y. Zhu, L. Kang, X. Wei, X. Wei, and S. Jiang. “Rethinking the Optimization of Average Precision: Only Penalizing Negative Instances before Positive Ones Is Enough”. Proceedings of the AAAI Conference on Artificial Intelligence, vol. 36, no. 2, June 2022, pp. 1518-26, doi:10.1609/aaai.v36i2.20042.