报告题目：Optimal subsampling via predictive inference
报告人：邹长亮 教授
报告时间：2023年12月8日（周五）下午 15:30-16:30
报告地点：藕舫楼724
主持人：曹春正 教授
报告人简介：
邹长亮，南开大学统计与数据科学学院教授、统计研究院院长。2008年于南开大学获博士学位，随后留校任教。主要从事统计学及其与数据科学领域的交叉研究和实际应用。研究兴趣包括：高维数据统计推断、大规模数据流分析、变点和异常点检测等，在Ann. Stat.、Biometrika、J. Am. Stat. Asso.、Math. Program.、J. Mach. Learn. Res.、Technometrics、IISE Tran.等统计学和工业工程领域期刊上发表论文几十篇，入选爱思唯尔“中国高被引学者”。主持基金委优青、杰青、重点项目、重大项目课题和科技部重点研发计划课题等。任教育部科技委委员、全国应用统计专业硕士教学指导委员会委员、中国现场统计研究会副理事长等。
报告简介：
In the big data era, subsampling or sub-data selection techniques are often adopted to extract a fraction of informative individuals from the massive data. Existing subsampling algorithms focus mainly on obtaining a representative subset to achieve the best estimation accuracy under a given class of models. We consider here a semi-supervised setting wherein a small or moderate sized “labeled” data is available in addition to a much larger sized “unlabeled” data. The goal is to sample from the unlabeled data with a given budget to obtain informative individuals that are characterized by their unobserved responses. We propose an optimal subsampling procedure that is able to maximize the diversity of the selected subsample and control the false selection rate (FSR) simultaneously, allowing us to explore reliable information as much as possible. The key ingredients of our method are the use of predictive inference for quantifying the uncertainty of response predictions and a reformulation of the objective into a constrained optimization problem. We show that the proposed method is asymptotically optimal in the sense that the diversity of the subsample converges to its oracle counterpart with FSR control.
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数学与统计学院
2023年12月7日