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报告题目: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530(星期三)10:40~11:40  报告二:2018年531日(星期四)14:4015:40

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。20116月毕业于西华师范大学数学与信息学院获学士学位,20119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。20149月至20176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.


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