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从源代码剖析Mahout推荐引擎 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...。
2. 标准化的程序开发过程
以UserCF的推荐算法为例，官方建议我们的开发过程：
图片摘自Mahout in Action
从上图中我们可以看到，算法是被模块化的，通过1,2,3,4的过程进行方法调用。
程序代码：
public class UserCF {
fin...
Are email addresses case sensitive?
...ite my email in all-lower-case. Just fired off an angry comment to Twitch.tv about that very thing in regards to their support site. They block you from even entering upper-case on their site. So while I know my email server treats them as case-insensitive, and I know the RFC states it is case-se...
Detecting 'stealth' web-crawlers
...nja|InternetSeer\.com|Iria|Irvine|JBH*agent|JetCar|JOC|JOC\ Web\ Spider|JustView|KWebGet|Lachesis|larbin|LeechFTP|LexiBot|lftp|libwww|likse|Link|Link*Sleuth|LINKS\ ARoMATIZED|LinkWalker|LWP|lwp-trivial|Mag-Net|Magnet|Mac\ Finder|Mag-Net|Mass\ Downloader|MCspider|Memo|Microsoft.URL|MIDown\ tool|Mirro...
Regular expression to match DNS hostname or IP Address?
...|SO|SR|ST|SU|SV|SY|SZ|TC|TD|TEL|TF|TG|TH|TJ|TK|TL|TM|TN|TO|TP|TR|TRAVEL|TT|TV|TW|TZ|UA|UG|UK|US|UY|UZ|VA|VC|VE|VG|VI|VN|VU|WF|WS|XN|XN|XN|XN|XN|XN|XN|XN|XN|XN|XN|YE|YT|YU|ZA|ZM|ZW)[.]?$/i';
if (preg_match, $pattern, $matching_string){
... do stuff
}
You may also want to add an if stat...
Difference between document.addEventListener and window.addEventListener?
... If you will add addEventListener("keydown", event) via window for Samsung TV, than it won't work. But you will do the same thing with document, then it will. Depends also on specific device how it calls bubbled events.
– Jakub Kubista
Jan 20 at 11:17
...
成功熬了四年还没死？一个IT屌丝创业者的深刻反思 - 资讯 - 清泛网 - 专注C...
...到最后只剩下一个员工。11年我把那个纯纯的App做到苹果官方推荐区免费榜的第一位，那段时间每天四五千iPhone安装量，结果一路烧钱，到最后濒临关闭;而如今，我只需把自己从纯纯的互联网降级下来，做一些看起来有些“低级...
基于PECL OAuth打造微博应用 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...旦多平台集成，很容易出现命名冲突之类的问题。
既然官方SDK不给力，那我们只能发扬自力更生的革命精神了！好消息是PHP本身已经有了一个标准的OAuth实现：PECL OAuth！下面以此为例来讲解一下：
说明：首先需要对OAuth概念有...
Web API 最佳入门指南 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...术
服务URI Pattern
准备工作
代码实现
什么是 Web API
官方定义如下，强调两个关键点，即可以对接各种客户端（浏览器，移动设备），构建http服务的框架。
ASP.NET Web API is a framework that makes it easy to build HTTPservices that reach a b...
What's the algorithm to calculate aspect ratio?
...tter-boxing lines (like the ones you get at the top and bottom of your old TV when you're watching a wide-screen movie on it). I'd add them at the top/bottom or the sides (whichever one results in the least number of letter-boxing lines) until the image meets the requirements.
One thing you may wan...
Simple state machine example in C#?
...nd);
ProcessState nextState;
if (!transitions.TryGetValue(transition, out nextState))
throw new Exception("Invalid transition: " + CurrentState + " -> " + command);
return nextState;
}
public ProcessState MoveNext(Command comman...