Programmer Group

sample Positive samples: samples belonging to a certain class (generally the desired class). In this case is a passing student.Negative samples: samples that do not belong to this category. In this case, it is a failed student. 　　y_pred = [0, 0, 0, 0, 0, 0, 1, 1, 1, 1]　　y_true = [0, 0, 0, 0, 1, 1, 1, 1, 0, 0] The above 0 represents failure ...

Online problem handling - feign call error Business scenario: Service 1 invokes service 2 through Feign. In the test phase, everything is normal and there is data loss online (to avoid simple reproduction of sensitive local). Errors are reported as follows: 2021-12-04 13:47:47.774 DEBUG 29480 --- [io-10011-exec-1] .w.s.m.m.a.ServletInvocableH ...

Operation ①:   requirement: Master Selenium to find HTML elements, crawl Ajax web page data, wait for HTML elements, etc. Use Selenium framework to crawl the information and pictures of certain commodities in Jingdong Mall. Candidate sites: http://www.jd.com/ Key words: Students' free choice Output information: the output information of MYSQ ...

2. First MVC program Hello，SpringMVC 2.1 configuration version 1. Create a new Moudle, springmvc-02-hello, and add web support! 2. Confirm that the dependency of spring MVC is imported! 3. Configure web.xml and register dispatcher Servlet <?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" ...

167. Sum of two II - input ordered array Topic overview Give an array of integers that have been arranged in non decreasing order numbers ，Please find two numbers from the array. The sum of the two numbers is equal to the target number target . The function should return the subscript values of these two numbers as an array of integers ...

The content may be sloppy, but they are all basic and important things that I think, and they also involve two multi-threaded interview questions Multithreading Process process Thread thread The program is static Process is an execution process of a program. It is a dynamic concept. A process will have multiple threads that do not affect ea ...

Summary and thinking of Java concurrent programming detailed series of best examples of Java Concurrent Programming     writing high-quality concurrent code is a very difficult task. The Java language has built-in pairs since the first version Multithreading Our support was great in those years, but when we Concurrent programming With a ...

The parameter parser is a component provided in the spring web package. Many parameter parsers are provided in the spring MVC framework. For example, the Controller code we developed is as follows: @RestController @RequestMapping("/user") public class UserController{ @PostMapping("/save") //Here, the request object is injected through t ...

tkMapper usage and demo demonstration 1. Realization Law of Dao Layer - Preface Entity classes correspond to data tables and are regular - they can be generated as long as the structure of the data table is known. A single word equals a single word, and multiple word fields are the hump nomenclature.The methods defined in the DAO interfaces o ...

catalogue 1, Disadvantages of traditional log collection 2, ELK collection system process 3, Build ELK system 4, Code 5, Verification effect 1, Disadvantages of traditional log collection         We know that most of us use logs to judge where the program reports errors, so that we can take a powerful medicine aga ...