杏吧传媒
数学大讲坛第一期
第五讲——德州大学阿灵顿分校杨媚博士学术报告
题目:Heavy Ball Flexible GMRES Method for Nonsymmetric Linear Systems
时间:2023年3月15日(周三)上午09:45——12:00
地点:腾讯会议(会议ID:742 390 037)
报告人:杨媚 博士
摘要:Flexible GMRES (FGMRES) is a variant of preconditioned GMRES, which changes preconditioners at every Arnoldi step. GMRES often has to be restarted in order to save storage and reduce orthogonalization cost in the Arnoldi process. Like restarted GMRES, FGMRES may also have to be restarted for the same reason. A major disadvantage of restarting is the loss of convergence speed. In this talk, we present a heavy ball flexible GMRES method, aiming to recoup some of the loss in convergence speed in the restarted flexible GMRES while keeping the benefit of limiting memory usage and controlling orthogonalization cost. Numerical tests demonstrate superior performance of the proposed heavy ball FGMRES to the restarted FGMRES.
报告人简介:
杨媚,2018年博士毕业于德州大学阿灵顿分校计算数学专业,2019-2021在上海交通大学做博士后研究,2021-2022在工业界工作一年,2023年开始在德州大学阿灵顿分校做统计方向博后。主要研究领域为数值代数,优化方法,深度学习,医学影像技术和统计学在医学影像技术中的分析应用。
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