Low rank matrices approximations have been used in link prediction for networks. which are usually global optimal methods and lack of using the local information. The block structure is a significant local feature of matrices: entities in the same block have similar values. which implies that links are more likely to be found within dense blocks. https://xafdxgooxnkspt.timeblog.net/70687888/development-of-a-nomogram-to-predict-30-day-mortality-of-sepsis-patients-with-gastrointestinal-bleeding-an-analysis-of-the-mimic-iv-database