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中国科学院刘歆研究员学术报告通知
发布人:蔡易  发布时间:2022-05-31   浏览次数:519

报告人:刘歆研究员

报告题目:Decentralized Optimization Over the Stiefel Manifold by an Approximate Augmented Lagrangian Function

摘要:We study the decentralized optimization problem over the Stiefel manifold, which is defined on a connected network of d agents. The objective is an average of d local functions, and each function is privately held by an agent and encodes its data. The agents can only communicate with their neighbors in a collaborative effort to solve this problem. In existing methods, multiple rounds of communications are required to guarantee the convergence, giving rise to high communication costs. In contrast, this paper proposes a decentralized algorithm, called DESTINY, which only invokes a single round of communications per iteration. DESTINY combines gradient tracking techniques with a novel approximate augmented Lagrangian function. The global convergence to stationary points is rigorously established. Comprehensive numerical experiments demonstrate that DESTINY has a strong potential to deliver a cutting-edge performance in solving a variety of testing problems.

报告时间:202262号下午14:30-17:00

报告形式:腾讯会议;会议号:386 321 948

 

报告人简介:刘歆,2004年本科毕业于北京大学数学科学学院;2009年于中国科学院数学与系统科学研究院获得博士学位。毕业后在中国科学院数学与系统科学研究院工作,2020年晋职为正研究员,2022年被聘为冯康首席研究员。主要研究方向包括:流形优化、分布式优化、统计大数据分析、材料计算、机器学习等。刘歆于2016年获得国家优秀青年科学基金;2016年获得中国运筹学会青年科技奖;2020年获得中国工业与应用数学学会应用数学青年科技奖;2021年获得国家杰出青年科学基金。现担任中国科学院数学与系统科学研究院-香港理工大学应用数学联合实验室副主任,中国青年科技工作者协会理事,中国运筹学会常务理事,中国工业与应用数学会副秘书长,《Mathematical Programming Computation》、《Journal of Computational Mathematics》、《Journal of Industrial & Management Optimization》等国内外期刊编委。