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系列报告 Convergence Study on the Logarithmic-Quadratic Proximal Regularization of Strictly Contractive Peaceman-Rachford
主讲人:郭科 博士
主办单位:数学与财经学院
讲座时间:报告一:2018年5月30日(星期三)10:40~11:40
报告二:2018年5月31日(星期四)14:40~15:40
讲座地点:知津楼C303
主讲人简介:
郭科,男,1989年5月生,博士,讲师。2011年6月毕业于西华师范大学数学与信息学院获学士学位,2011年9月保送西华师范大学数学与信息学院攻读应用数学专业硕士研究生,师从四川省学术和技术带头人李军教授,研究方向为优化理论及应用。2014年9月至2017年6月在南京师范大学数学科学学院计算数学专业读博士,师从国家杰出青年基金获得者韩德仁教授,研究方向为非凸优化。
报告一摘要:
Recently, a strictly contractive Peaceman-Rachford splitting method with logarithmic-quadratic proximal regularization (SPRSM-LQP) was proposed for solving two-block separable convex minimization model. In practical applications, however, the smaller step-size should be strongly avoided. On the contrary, we actually have the desire of seeking larger step sizes whenever possible in order to accelerate the numerical performance.
报告二摘要:
We consider the convergence of the Douglas-Rachford splitting method (DRSM) for minimizing the sum of a strongly convex function and a weakly convex function; a setting having various applications especially in some sparsity-driven scenarios with the purpose of avoiding biased estimates which usually occur when convex penalties are used.