QA Official

Ubuntu 16.04 Unable to Install Third Party deb Software Solution

https://qaofficial.com/post/2019/04/27/73475-ubuntu-16.04-unable-to-install-third-party-deb-software-solution.html 2019-04-27
Solution Referred to Wind-Like Programmers Ubuntu 16.04 comes with a software center that is probably problematic. The third player software is rarely installed successfully and the solution is relatively simple. Let's change to a software management tool. first, we install gdebi. sudo apt install gdebi-core 安装好gdebi以后,从终端进入到待安装软件包所在

controller cannot get the value configured by @Value-spring parent-child container

https://qaofficial.com/post/2019/04/27/73732-controller-cannot-get-the-value-configured-by-value-spring-parent-child-container.html 2019-04-27
In the controller, the @Value annotation cannot get the value, but the ${key} string is directly output. Reason: the project is configured only in applicationContext.xml and not in spring-mvc.xml Resolution: corresponding container scans configuration files written with property or the parent container is injected to obtain the attribute, and getter and setter methods are provided to the outside, and the child container is obtained through the getter method analysis:

scikit-learn chinese document cross-validation-unsupervised learning | apachcn

https://qaofficial.com/post/2019/04/27/73846-scikit-learn-chinese-document-cross-validation-unsupervised-learning-apachcn.html 2019-04-27
chinese document: http://sklearn.Apache cn.org/cn/stable/modules/cross _ validation.html english document: http://sklearn.Apache cn.org/en/stable/modules/cross _ validation.html Official Document: http://scikit-learn.org/stable/ github: https://github.com/apachecn/scikit-learn-doc-zhStar, we have been working hard) Contributor: https://github.com/apachecn/scikit-learn-doc-zh# Contributor About Us: http://www.apachecn.org/organization/209.html Note: This document is being translated...

scikit-learn learning 3.1. cross-validation: evaluating estimator performance

https://qaofficial.com/post/2019/04/27/73863-scikit-learn-learning-3.1.-cross-validation-evaluating-estimator-performance.html 2019-04-27
Learning the parameters of the prediction function on one data set and testing on the same data set is a wrong method: because a model only repeats the labels of the samples that have just been trained, the result is very high in this case, but it is impossible to predict when encountering samples that have not been trained.This is called overfitting.In order to avoid over-fitting, a common practice is to keep some samples as test sets (X_test, y_test) when conducting a (supervised) machine learning experiment.

【Scikit-Learn Chinese Document] Cross Validation-Model Selection and Evaluation-User Guide | ApacheCN

https://qaofficial.com/post/2019/04/27/73838-scikit-learn-chinese-document-cross-validation-model-selection-and-evaluation-user-guide-apachecn.html 2019-04-27
chinese document: http://sklearn.Apache cn.org/cn/stable/modules/cross _ validation.html english document: http://sklearn.Apache cn.org/en/stable/modules/cross _ validation.html Official Document: http://scikit-learn.org/stable/ github: https://github.com/apachecn/scikit-learn-doc-zhStar, we have been working hard) Contributor: https://github.com/apachecn/scikit-learn-doc-zh# Contributor About Us: http://www.apachecn.org/organization/209.html Note: This document is being translated...

Extend ThreadPoolExecutor to Realize Thread Pool Monitoring

https://qaofficial.com/post/2019/04/27/73601-extend-threadpoolexecutor-to-realize-thread-pool-monitoring.html 2019-04-27
Abstract: Background In development, we often use Executors class to create thread pools to perform a large number of tasks, and use the concurrency characteristics of thread pools to improve system throughput.However, improper use of thread pool will also deplete server resources and lead to abnormal situations, such as too many blocked queue tasks in fixed thread pool and too many threads created in cache thread pool, resulting in problems

HTML [Getting Started]

https://qaofficial.com/post/2019/04/27/73878-html-getting-started.html 2019-04-27
Data Source from Zhihu-"Whether it is effective is still unknown. First Book, Getting Started 《Head first HTML&CSS》The best introductory book.After reading it twice, I have a general impression of HTML & CSS.At this time, the w3cschool is collected as a reference manual.

Introduction to Open Source Data Mining Tool Orange

https://qaofficial.com/post/2019/04/27/73926-introduction-to-open-source-data-mining-tool-orange.html 2019-04-27
original address: http://cloga.info/python/2014/01/02/orange intro/# wat _ e _ 19338566-a664-48dd-adf4-325f96bcec42

Learn Java multithreading from me-Thread Pool Executor

https://qaofficial.com/post/2019/04/27/73591-learn-java-multithreading-from-me-thread-pool-executor.html 2019-04-27
What is a Thread Pool In multi-threaded development, due to the large number of threads and the completion of each thread's execution for a period of time, it is necessary to create threads frequently. However, such frequent thread creation will greatly reduce the efficiency of the system, because it takes time to create threads frequently and destroy threads.In this case, people want a thread that does not need to be

Summary of Form Usage in HTML

https://qaofficial.com/post/2019/04/27/73893-summary-of-form-usage-in-html.html 2019-04-27
Summary of Form Usage in HTML 1. Standard Form Format:<form method="" action="" enctype="multipart/form-data" > <input type="text" name="username" /> <input type="password" name="pwd" /> </form > where the value of method can make get or post different is that when get requests, the data size cannot exceed 2k, and the requested content will appear on the address bar.When post requests, the request data cannot exceed 8M but can be increased by setting.