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Machine Learning Basics (iii)--information, information entropy and information gain

}^NP (x_i) \log_2 p (x_i)The sum of the traversal multiplication can be calculated using the inner product entropy. Information entropy, which is used to measure the degree of disorder of information (the greater the entropy, the more disordered, equals 0 o'clock, means that all categories are the same, fully ordered) the properties of entropy: (1) non-negative, 0 ≤0 0 The Shannon entropy and the best partitioning characteristics of the computed data set Calculates the Shannon entropy of a data

Regular expression notes three-regular expressions

location of the next start of a global match Remember JYF once asked me how to control where the match started. Well, now I can answer that question. Perl provides a POS function that adjusts the position of the next match to begin in the/g global match. Examples are as follows: Copy Code code as follows: $_= "ABCDEFG"; while (/.. /g) { Print $; } Its output is every two letters, AB, CD, EF You can use POS ($_) to reposition the next match start, such as:

Autodesk Official latest. NET tutorial (v) (vb.net edition)

employee with the attribute definition of the block, so we want to create a The corresponding property index to display the employee's name. Property indexes will use properties defined by the property. Replace: btr. Appendentity (BR) ' joins the index into the model space trans. Addnewlycreateddbobject (BR, True) ' Let transactions know for Dim Attref as Attributereference = New attributereference () ' Traverse employee block to find attribute definition Dim empbtr as Blocktablerec

A simple MySQL Database Installation Method

AlthoughInstall MySQL databaseThere are a lot of articles, but I think it is difficult for beginners to write a simple method for your reference. I hope it will help you. MySQL database installation method: Var isMinNS4 = (navigator. appName. indexOf ("Netscape")> = 0 parseFloat (navigator. appVersion)> = 4 )? 1: 0; var isMinIE4 = (do ***** ent. all )? 1: 0; var isMinIE5 = (isMinIE4 navigator. appVersion. indexOf ("5.")> = 0? 1: 0; // var FONTSIZE =

C # Operations cad-reading and modifying data

The main purpose of our operation of CAD is to read and modify or delete the data, because the content is more, here we first talk about the basis, follow-up slowly explained.1, the CAD data read and modify before the locking operation to avoid a document is modified by multiple users conflict.Database db = Hostapplicationservices.workingdatabase;//Current Databaseusing(Transaction tr = db.) Transactionmanager.starttransaction ())//using, automatically calls the Dispose method{//Processing Proce

Uninstall Mysql, Apache, and Php in Linux

version number is not to be played, for example, we next to uninstall the mysqlclient10-3.23.58-4.RHEL4.1 package, the method is as follows: Rpm? E mysqlclient Uninstall Apache [Root @ localhost ~] # Rpm-qa | grep httpd Httpd-manual-2.0.52-25.ent System-config-httpd-1.3.1-1 Httpd-2.0.52-25.ent Httpd-suexec-2.0.52-25.ent Note: The method is the same as to uninsta

The idea and implementation of session in CGI

hash_key to session hash_key */ If (HTTP_COOKIE = "" strcmp (HTTP_COOKIE + 9, str_hash_key )! = 0) { Print_session_error ("3 "); Exit (1 ); }/** * Compare client ip to session ip */ If (strcmp (REMOTE_ADDR, str_client_ip )! = 0) { Print_session_error ("4 "); Exit (1 ); }/** * Refresh session active time */ Time ( now ); Sprintf (str_time, "% 10d/n", now ); Fseek (sf, 0, SEEK_SET ); Fputs (str_time, sf );/** * Get new hash_key */ Srand (now ); R = rand (); For (I = 0; I { Srand (r ); R = rand ()

Uninstall Mysql, Apache, and Php in Linux

-manual-2.0.52-25.ent System-config-httpd-1.3.1-1 Httpd-2.0.52-25.ent Httpd-suexec-2.0.52-25.ent Note: The method is the same as to uninstall MySQL. Uninstall PHP [Root @ localhost ~] # Rpm-Qa | grep PHP Php-odbc-4.3.9-3.15 Php-4.3.9-3.15 Php-mysql-4.3.9-3.15 Php-pear-4.3.9-3.15 Php-ldap-4.3.9-3.15 Php-pgsql-4.3.9-3.15 Note: The method is the same as to uninstall

Open English book 3

author, the more connected we get in communications technology, the ____ closer ___ we are. 34. What are the examples the author gives to explain his idea that every advance in communications technology is a setback to the closeness of human interaction? All of the above 35. What is the unintended result of communication technology, according to the author? It actually creates a distance between people instead of bringing them together 36. The specified ent

[Music Appreciation] wind flowers

Many songs are often inexplicably touched, with a surging sensation in your eyes.Just like this wind flowersHttp://play.kele.cc/kaokao_kele//html_l12/l/0020/27.wma Windflowers, my father told me not to go near them he said he feared them always, and he told me that they carried him awaywindflowers, beautiful windflowersi couldn't wait to touch them, to smell them I held them now I cannot break your sweet bouquet beyond the vapor in the same take a warning, sonwindflowers, please

Directly traverse the memory leakage after DirectorySearcher. FindAll ()

To write a small program these two days, you need to use the user who traverses the AD domain and regularly click it. According to the habit of simple writing, the following things will happen.//////////////////////////////////////// //////////////////////////////////////// //[Csharp]DirectoryEntry ent = new DirectoryEntry (@ "LDAP: // domainName/OU = xxx, DC = xxx, DC = com", "aduserName", "adPassword "); // bind to the OU specified by ADDirectorySea

Scandir Use Example

int filter_fn (const struct dirent * ent) { if (ent->d_type! = Dt_reg) return 0; Return (strncmp (Ent->d_name, "W_", strlen ("w_")) = = 0);} void Syswatcher::scan_log (const char * dir_name) { int n; struct dirent **namelist;//struct DI Rent * namelist[]; n = scandir (Dir_name, namelist, FILTER_FN, Alphasort); if (n Scandir Using example

Use of Hashtable and dictionary<t,k>

Since Hashtable is internally ordered (according to the hashcode of key), there are times when the use of Hashtable can result in an uncontrolled sequence of data, and there are two ways to solve the problem.Test code:DictionaryHt. ADD ("http://www.sina.com.cn", "");Ht. ADD ("http://www.bjut.edu.cn", "");Ht. ADD ("http://lib.bjut.edu.cn", "");Ht. ADD ("http://news.bjut.edu.cn", "");Ht. ADD ("http://sse.bjut.edu.cn", "");Ht. ADD ("http://lexus.cnblogs.com", "");Ht. ADD ("Http://www.sina.com.cn/sp

Javascript Object-Oriented Programming (coolshell)

: 'http: // jb51.net '}});Person. sayHello = function (){Var hello = ""My email is:" + this. email + ", "My website is:" + this. website;Document. write (hello + "}Var Student = Object. create (Person );Student. no = "1234567"; // Student IDStudent. dept = "Computer Science"; // System// Use the attributes of PersonDocument. write (Student. name + ''+ Student. email +'' + Student. website + '// Use the Person MethodStudent. sayHello ();// Reload the SayHello MethodStudent. sayHello = function (p

Three. Apache Web page rewrite squid

###### #网页重写 ########All 80 port requests are redirected by HTTPSSystemctl start httpd Firewalldcd/var/www/html/[Email protected] html]# firewall-cmd--permanent--add-service=httpSuccess[Email protected] html]# firewall-cmd--permanent--add-service=httpsSuccess[Email protected] html]# Firewall-cmd--reloadYum Install Mod_sslInstall HTTPSGenkey www.westos.com[Email protected] conf.d]# vim news.conf---------------------------------------ServerName news.westos.comDocumentroot/var/www/virtual/news/html

How to design an e-commerce website Step by step with DDD (eight)--integration of membership price

user, it is necessary to add the UserID parameter in the cartrequest, let the purchase context pass the data to ensure the business needs here. Public class cartrequest { publicstringgetset;} Public string UserId Get Set ; } Public Get Set ; } }  The calculation of the member's price is the function of rank and discount (value object) , which can be used to create a method in this value object, and the implementation of this is the calculation of the discount

yum-php Environment Preparation

Description: Rpm–qa | The grep mysql command is to list all MySQL related packages, the example above is the LinuxAS4 default install MySQL RPM package list, If it's a list of other Linux versions, it might not be the same, but don't worry, no matter what, uninstall starts with the bottom one, until the first one is uninstalled. Description: Rpm–e is the command to unload the RPM package, followed by the package name, the final version number is not to fight, such as our ne

LRU Cache--Leetcode

->pre->next =node; toNode->pre = tail->Pre; +Node->next =tail; -Tail->pre =node; the } * voidDelete (Dlist *node) $ {Panax NotoginsengNode->pre->next = node->Next; -Node->next->pre = node->Pre; the } + void Set(intKeyintvalue) { A if(data.size () = = Cap data.count (key) = =0) the { + if(Front->next = = tail)return; -Data.erase (front->next->key); $Addr.erase (front->next->key); $Delete (front->next); - } - if(Data.count (key) = =0

Decision Tree algorithm

gainUsing some of the concepts of information entropy, in a sample set, the more "chaotic" the classification of a sample, the more information entropy it has, the more impure the sample is, and the more "neat" a sample is, the less information entropy it has, the purer the sample. The classification of samples is [1,1,1,0] than [1,1,0,0] good, the former is more "neat", more pure. So, if a property is divided into more pure samples, then the more we tend to choose this property.D is a collecti

Cad.net Delete Wipeout

Namespace Bccdelwipout{public class Draftingtools{[Commandmethod ("Bcc:wout")]public static void Bccdeletewipout (){Document doc = Application.DocumentManager.MdiActiveDocument;Database db = Doc. Database;Transaction TR = db. Transactionmanager.starttransaction ();using (TR){Blocktable BT = tr. GetObject (db. Blocktableid, Openmode.forwrite) as blocktable;foreach (ObjectId objId in BT){Blocktablerecord BTR = Objid.getobject (openmode.forwrite) as Blocktablerecord;foreach (ObjectId Btrobjid in BT

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