• UML II. Modeling elements (1)


    This chapter introduces UML modeling elements 1:Stereotype – also known as type, stereotype The function of element extension in UML is simply to add some tags on the existing types, similar to stamping, so as to generate new things. Simply add a sentence to describe this class more clearly and accurately. 2:Actor is someone or […]

  • Luo Yuanfei: Research on Automatic Feature Engineering in Recommendation System


    In the sharing of the first issue of recommendation system college, Luo Yuanfei, senior researcher of the fourth paradigm, introduced how to automatically generate features and selection algorithms efficiently in the index level search space for the high-dimensional sparse data in the recommendation system, and how to combine the large-scale distributed machine learning system to […]

  • Version iterative control (not git / SVN)


    When it comes to version control, most people’s minds must immediately think of itgitandsvnWell, it’s a pity that they’re not the main characters this time Although GIT and SVN are good, they can also be developed well for some projects, but for some scenarios, there are still some problems For example, let’s take a scenario: […]

  • Design cache scheme based on repository


    Compared with using a middleware to “brutally” cache interface response and improve interface query speed, repository cache can better control cache granularity and update time Lu Xun. Articles updated in my Zhihu column and blog scene Tester-a: why is the getinfo interface so slow? 5 + S? QPS is only 10!!!! Rd-b: This is because […]

  • Microservice Architecture


    1. Brief Introduction to Micro Services Microservice is a software architecture pattern. It advocates dividing a single application into a group of small services, which coordinate and cooperate with each other to provide users with ultimate value. Each service runs in its own independent process, and it communicates with each other through lightweight communication mechanism […]