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<a href="/2024/12/26/nndeploy-1/" class="post-title-link" itemprop="url">如何看懂 nndeploy</a>
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<span class="post-meta-item-text">发表于</span>
<time title="创建时间：2024-12-26 23:48:50 / 修改时间：23:58:27" itemprop="dateCreated datePublished" datetime="2024-12-26T23:48:50+08:00">2024-12-26</time>
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<span>37k</span>
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<span>34 分钟</span>
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<p>最近这半年实在是闲，秉承着下班少玩手机的目的，7 月开始学 <code>cuda</code>，8 9 月学了 <code>C++</code>，10 月懈怠了一个月，11 月学了 <code>cuda</code> 进阶，12 月我来祸害 <a target="_blank" rel="noopener" href="https://github.com/nndeploy/nndeploy"><code>nndeploy</code></a> 了。</p>
<p>一来是学完 <code>C++</code> 后看下我能看懂的优秀的开源项目，一方面在之前学校训练模型感觉没意思，是看看 <code>AI</code> 的工程化。</p>
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<a href="/2024/08/04/CUFX/" class="post-title-link" itemprop="url">CUFX(CUDA Framework eXtended)： CUDA 计算框架</a>
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<time title="创建时间：2024-08-04 14:31:33 / 修改时间：21:19:17" itemprop="dateCreated datePublished" datetime="2024-08-04T14:31:33+08:00">2024-08-04</time>
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<span>1 分钟</span>
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<p>利用下班时间学完了 CUDA，Anyway 忙起来真的很大程度能缓解焦虑，能忘记和忽略很多烦恼。所以寻思着结合这一年来所学，写了一个简单的 CUDA 计算框架：<a target="_blank" rel="noopener" href="https://github.com/muyuuuu/CUFX/tree/main/CUFX">CUFX</a>。</p>
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<a href="/2024/07/26/type-ensure/" class="post-title-link" itemprop="url">重返C++：C++ 类型擦除</a>
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<time title="创建时间：2024-07-26 00:38:30" itemprop="dateCreated datePublished" datetime="2024-07-26T00:38:30+08:00">2024-07-26</time>
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<p>对于 <code>C++</code> 中的匿名函数，除了写 <code>auto</code> 外，还可以使用 <code>std::function</code> 作为类型接受匿名函数：</p>
<figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">std::function<<span class="type">void</span>(<span class="type">int</span>)> func = [](<span class="type">int</span> x) {</span><br><span class="line"> std::cerr << x << <span class="string">"\n"</span>; </span><br><span class="line">};</span><br></pre></td></tr></table></figure>
<p>问题来了，刚开始的时候我以为 <code>std::function<void(int)></code> 就是匿名函数的返回类型，在 <code>github</code> 上给别人发送 <a target="_blank" rel="noopener" href="https://github.com/parallel101/cppguidebook/pull/48"><code>PR</code> </a> 时就发生了笑话。</p>
<p>实际上这两个类型并不相同，<code>function</code> 是一个类型擦除容器，而 <code>lambda</code> 匿名类型简单来说就是重载了 <code>operator()</code> 的类。由于 <code>std::function</code> 有转换构造函数，<code>lambda</code> 表达式得以调用这个转换构造函数，构造出这一个 <code>std::function</code>对象，所以这个赋值发生了隐式类型转换。</p>
<p>在一些代码中，我们可能无法保留原有的数据类型，上面的匿名函数就是典型的例子。这个时候需要用一种通用的类型去使用它们，需要去掉对象原有的数据类型，也就是类型擦除 (Type Erasure)。</p>
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<p>C++ 漫游的第一部分，起因源于项目中错误的使用 std::ref 和 std::fowrad 导致了一些神奇的 bug。而 std::ref 又涉及到了引用，左右值引用又会联想到移动语义，std::forward 又常用于模板。所以以此为契机，不如仔细学习一下 C++ 中的新特性。</p>
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<p>2018 年计算机组成原理的大作业，五级流水不会写，三级流水写不出来。竟然没想不到多年后还会用到多级流水的思路去设计代码。</p>
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<p>移动端算法优化是个很庞大的话题。从计算机体系到指令，涉及到非常广而深的东西。本文尝试以常见的算法为例，阐述算法在单线程场景下的加速与优化，<del>多线程是最后的收尾，没啥可说的</del>。而至于具体的场景，如金字塔、滤波、降噪等，优化的思路都是相同的：减少 IO，一次 IO 完成尽可能多的计算。</p>
<p>本文会使用 <code>Neon, OpenCL</code> 来优化算法，如果有可能也会引入 <code>DSP</code>。本文持续更新，整理算法优化相关的经验。额外的，确保打开了 <code>O3</code> 编译选项，打开 <code>release</code> 模式等，否则会影响算法的执行时间。</p>
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<p>之前对 <code>C</code> 语言中宏定义的认知十分简单，包括但不限于停留在以下浅薄的层面：</p>
<figure class="highlight c++"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#<span class="keyword">define</span> PI 3.14</span></span><br><span class="line"><span class="meta">#<span class="keyword">define</span> add(a, b) a + b</span></span><br></pre></td></tr></table></figure>
<p>上述代码完全是大学课本中的用法。但当我看到实际项目中宏的用法后完全是一头雾水，<del>所以自己也要写出那种高逼格让别人看不太懂的代码</del>。宏远远比我想象的要强大，所以本文为每个宏技巧都配备了一个实用场景。</p>
<ul>
<li>字符串化操作符，实现一个简单的自动化测试样例</li>
<li>字符串连接，实现一个具备计时功能的宏</li>
<li>X 宏，实现根据输入执行不同的函数</li>
<li>特殊宏 <code>__VA_ARGS__</code>，实现一个简单的日志函数</li>
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