) −s (c,a)The gain represents the entropy of the classification target minus the entropy of the current attribute, the greater the gain, the stronger the classification ability(the former is called Empirical entropy, which indicates the uncertainty of the data set classification C, the latter is the empirical condition entropy, which indicates that the uncertainty of the data set classification C under the condition given a is called mutual information, and the gain of the decision tree is equiv
6.4 M vim-enhanced i386. 0.109-7.2.el5 base 1.2 MUpdating: vim-minimal i386. 0.109-7.2.el5 base 310 k Transaction Summary ============================== ========================================================== ======= Install 3 Package (s) update 1 Pac Kage (s) Remove 0 Package (s) Total download size: 9.4 MIs this OK [y/N]: yDownloading Packages :( 1/4): vim-minimal-7.0.109-7.2.el5.i386.rpm | 310 kB (2/
inspired by functional programming. She's actually a string of elements that support continuous, parallel aggregation operations. From the syntax, it is also very similar to the Linux pipeline, or chain programming, the code is simple and concise, very cool handsome!Viii. date/time API (JSR 310)The new Java 8 date-time API (JSR 310) is influenced by Joda-time and provides a new Java.time package that can b
method of hash value is to useExcept the remaining remainder. That is, for an array of prime numbers M, for any positive integer k, calculate the remainder of k divided by M. M is generally a prime number.2. String
When using a string as the key, we can also use it as a large integer and use the retained division method. We can hash each character value of the string, for example
Public int GetHashCode (string str) {char [] s = str. toCharArray (); int hash = 0; for (int I = 0; I The default Im
icons and splash screen, the pictures are stored in the assets directory mentioned earlier, unlike Windows 8, you can set the default size of the app, you can also set the app's 310 * 310 logo.3. functionMainly specify the system functions that the application can use, such as we need to get the user location coordinates, we need to tick the "location" function.4. DisclaimerThe main additions to the app's
Today, due to project requirements, I want to virtualize the XP system running program on the server and map the production files directly to the linux system. OK, start preparing 1. go to the VMWame official website to download the latest version of VMware-Workstation-Full-7.1.4-385536.i386.bundle (310 M) need to first register, confirm the mailbox, and then download, the evening is faster 2. download the xpsp3 image file zh-hans_windows_xp_professio
function PrintArray (arr) {for (var i in arr) {if (Arr[i] instance of Array) {PrintArray (Arr[i]);}else{document.write (arr[i]+ ");}}}var data=[1,[20,21],[[301,302],[310,[311]];PrintArray (data);After the above code is run, the page output is?Answer: 1 20 21 301 302 310 311The function PrintArray uses recursion to output each member of the array one by one, separated by a spaceThe instanceof operator is use
cursor, dynamic cursor, keyset-driven cursor Cursors are dynamic by default, and when a scrolling cursor fetches rows, the cursor reflects the most recent changes made in the result set, and to establish a static cursor, you can add the INSENSITIVE keyword after the cursor name. However, this keyword is not used in time, and when a cursor's SELECT statement has distinct, union,group by or having keyword, the way the cursor is handled is the same as the specified insensitive keyword, when the re
power of 2 includes or is not included. When carrying, we found that the low number of simple bounce, high number in the adjacent low from 1 to 0 o'clock to jump into: 0000, 0001, 0010, 0011, 0100, 0101, 0110, 0111, 1000, 1001, 1010, .... For a given binary number, the maximum possible value is that they are all 1 o'clock (the minimum value is naturally 0). And the maximum value is simply 1 less than the next power of 2: for example, 112 = 310, which
windowThe main thing in the Chat window is to send a message to the server and accept the message from the server, which is accepted by the child thread, and the code is as Follows:Class ChatFrame (wx. Frame): "" "chat window" "" def __init__ (self, parent, id, title, size): ' initialize, add control and bind event ' Wx. frame.__init__ (self, parent, id, title) self. SetSize (size) self. Center () self.chatframe = wx. Textctrl (self, pos = (5, 5), size = (490,
The purpose of this paper is to collect and collate the famous works in the history of mathematics, so as to make it easier for friends who are interested in mathematics to read. The following time will be a short description for each book, so that you can understand its content.This article will continue to update"Element" translated "original", author Euclid."Mathematical Collection" translated "Mathematical compilation", the author Pappus a.d. Third century end.Treasury of analysis, the autho
keyboard technology ) 1, when input to get the focus, 2, the soft keyboard will pop up, 3, the fixed layer needs to move up, 4, the successful input ; 5, when input blur or keyboard hit enter, fixed restore position (here to be thankful that 360 does not have the default with rotation screen following the rotation, or else a little trouble)Now that the analysis is complete, write the code.1. Add Recognition Browser code
1
varisSpecialBrowser = navigator.userAgent.match(/360
packages were not upgraded. You need to download the 310 KB package. 339 KB of extra space is consumed after decompression. Do you want to continue? [y/n] Y get: 1 http://cn.archive.ubuntu.com/ubuntu/vivid-updates/main libcurl3 amd64 7.38.0-3ubuntu2.2 [+ KB] gets: 2 http ://cn.archive.ubuntu.com/ubuntu/vivid-updates/main Curl AMD64 7.38.0-3ubuntu2.2 [129 kb] Download 310 KB, takes 0 seconds (kb/s) (number
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