unspsc classification

Log4Net log classification and automatic maintenance, log4net log ClassificationBackground In the program, Log4Net is a good solution for debugging runtime information. I don't know if I use it badly. Instead, I don't want to read the logs. The reason is that I use the default Logger of n functions to record logs. In this way, the information recorded by all functions is dependent on the same configuration, so all the information is in one file, somet

INSERT into ' type ' (' id ', ' fid ', ' name ') VALUES (null, ' 6 ', ' Ausu '), (null, ' 6 ', ' hp '); Copy CodeThird, delete if you want to delete the category {notebook}, you can: DELETE from ' type ' WHERE ' ID ' =6 Copy Code{Notebook} sub-classification also remember to do the corresponding processing Function del ($FID) { $sql = "S

min costfunction because h (x) changes, costfunction if the form of linear regression, it is not convex, you can not use gradient descent method convex And the comparison of Non-convex So, the predecessor thought to give H (x) plus log way as costfunction, such a costfunction into convex From the above two curves, when the y=1, Costfunction gradually reduce the method is to make H (x) toward 1 when the y=0, to costfunction gradually reduced, is to make H (x) toward 0, which integrates o

Summary:Naive Bayesian classification is a Bayesian classifier, Bayesian classification algorithm is a statistical classification method, using probability statistical knowledge classification, the classification principle is to use the Bayesian formula based on the prior pr

, conversely, the lower; 2, through the search engine to determine the number of searches, 3, the target audience interested degree test. When the site is positioned as "representational" for hundreds of keywords, this "positioning" becomes a touch-and-see Web site content model. At this point, you can not have the content of the site, the content of the site in advance classification. Do not directly to the general, summary of the site positioning fo

PHP Code:-------------------------------------------------------------------------------- /* Name: Business logic Encapsulation for classification operations * * Author: Handsome like scum qq:1191391 e-mail:netcat2@21cn.com * * Completion Date: 2003-12-18 13:33 * * Description: The other classes referenced in this class (DB, Table, Item) are not provided, so this class can only do a reference, can not directly apply the * is not my sti

For support vector machines, it is a class two classifier, but for multiple classifications, SVM can also be implemented. The main method is to train more than two types of classifiers. One, multiple classification 1, a pair of all (One-versus-all OVA) Given m classes, you need to train M two class classifier. Where the classifier I is to set the class I data to Class 1 (positive Class), all other classes other than the M-1 I class are set to Cla

I believe many of the small partners learn PHP will try to do an online mall as a way to improve their technology. A variety of commodity classification, commodity name, such as the operation should be handy, then you can try to the unlimited level of the production of classified lists. To a search on the internet PHP Unlimited polar classification, a lot of, but a lot of is a, and, write a very messy, cod

对于什么是分类目录?什么是网站目录?什么又是网站检索?他们之间的区别是什么?网站目录对于我们的站点又有哪些优势?在构建网站目录的时候需要注意哪些问题?也许新手站长能知道其中的一个方面，但是知识体系不够完善， The author combines their usual website directory to build experience in detail analysis: As the name suggests, the classification directory is nothing more than manual collection of Web site resources, some valuable resources through the artificial way to organize their theme, storage to the corresponding directory below, so the formation of the

Speaking of network products, the topic is inseparable from the user, just like the traditional industry consumers. People are complex, user behavior is more complex, users and users are not the same, or that each user is different. A successful internet product often does not meet the needs of all users, but the accurate positioning of a certain type of users and well meet the needs of those users. What kind of users we need to think about, so we need user