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如何选择机器学习算法 - 大数据 & AI - 清泛网移动版 - 专注C/C++及内核技术

...学习算法Choosing-a-Machine-Learning-Classifier如何针对某个分类问题决定使用何种机器学习算法? 当然,如果你真心在乎准确率,最好的途径就是测试一大堆各式各样的算法(同时确保在每个算法上也测试不同的参数),最后选择在交...
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Difference between a “coroutine” and a “thread”?

...ple threads may be executing at any given time. (Traditionally, on single-CPU, single-core machines, that concurrency was simulated with some help from the OS -- nowadays, since so many machines are multi-CPU and/or multi-core, threads will de facto be executing simultaneously, not just "conceptual...
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实现一个简单的服务端推方案 - 更多技术 - 清泛网 - 专注C/C++及内核技术

...时性较差。虽然可以通过加快轮询频率的方式来缓解这个问题,但相应付出的代价也不小:一来会使负载居高不下,二来也会让带宽捉襟见肘。 再来说说Long Polling,如果使用传统的LAMP技术去实现的话,大致如下所示: Long Pol...
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How can I test a Windows DLL file to determine if it is 32 bit or 64 bit? [duplicate]

...programs, regardless of whether they are compiled for x32 or x32/x64 ("All CPU"). Appears as if every .NET executable has a 32-bit native header, and it calls the appropriate 32-bit or 64-bit .NET runtime when its invoked. – Contango Mar 2 '11 at 12:16 ...
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微博为什么限制140字(附短信70字限制考) - 创意 - 清泛网 - 专注C/C++及内核技术

微博为什么限制140字(附短信70字限制考)问题的提出申请过那么多的微博,数申请网易微博的动机最不纯,因为它的字数限制不是传说中的140字,而是163个字。当年觉得很可爱,于是就注...问题的提出 申请过那么多的微博,数申...
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Debug Error \"pure virtual function call\" 原因解析 - 更多技术 - 清泛...

...函数中抛出异常,不然,我们不得不面对以下两个严重的问题: 二次异常导致程序退出; 遗留下来的未完全销毁的对象与未完成的工作导致的后续问题 pure virtual function call就是这种情况。 但是理想与现实总是有差距的,...
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What is the difference between an IntentService and a Service? [duplicate]

... app; when you extends Service, you must manually spawn new threads to run CPU blocking operations. vs IntentService is a subclass of Service which spawns a thread to do background work from there(No need to create a new thread to do CPU blocking operations). ...
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StackOverflow程序员推荐:每个程序员都应读的30本书 - 杂谈 - 清泛网 - 专...

...尔、巴赫书》。他极为深入研究了程序员每日都要面对的问题:递归、验证、证明和布尔代数。这是一本很出色的读物,难度不大,偶尔有挑战,一旦你要鏖战到底,将是非常值得的。 – Jonik 13. 《代码整洁之道》 推荐数...
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OnInitUpdate、OnUpdate、OnDraw与OnPaint - C/C++ - 清泛网 - 专注C/C++及内核技术

...。 在用户进行输入后如何使视的状态得到更新?这个问题在一个文档对应一个视图时是不存在的,但是现在有一个文档对应了两个视图,当在一个视上进行了 输入时如何保证另一个视也得到通知呢?MFC的做法是利用文档来处...
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Beyond Stack Sampling: C++ Profilers

... First: Time sampling profilers are more robust than CPU sampling profilers. I'm not extremely familiar with Windows development tools so I can't say which ones are which. Most profilers are CPU sampling. A CPU sampling profiler grabs a stack trace every N instructions. This ...