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<h1 id="git">Git 与版本控制<a class="headerlink" href="#git" title="Permanent link">&para;</a></h1>
<p><em>Git 是软件团队在不相互覆盖工作的情况下进行协作的方式。本文涵盖 Git 的心智模型、分支策略、合并与变基、冲突解决、拉取请求，以及管理机器学习特定挑战（如大文件和实验追踪）的方法。</em></p>
<ul>
<li>
<p>每个严肃的软件项目都使用版本控制。<strong>Git</strong> 是主导系统，几乎所有开源项目和公司都在使用。没有 Git，协作就是通过电子邮件发送 zip 文件并祈祷没人覆盖你的更改。有了 Git，每次更改都可追踪、可撤销、可追溯。</p>
</li>
<li>
<p>对于机器学习工程师：Git 追踪你的代码、配置和实验脚本。结合实验追踪工具，它能提供可重现性："是哪个确切的代码和配置产生了这个模型？"</p>
</li>
</ul>
<h2 id="_1">心智模型<a class="headerlink" href="#_1" title="Permanent link">&para;</a></h2>
<ul>
<li>
<p>Git 追踪项目的<strong>快照</strong>。每次提交都是那一刻所有追踪文件的完整快照，而不是差异（在内部，Git 为效率存储差异，但从概念上讲，每次提交都是一个完整状态）。</p>
</li>
<li>
<p>文件的四个"位置"：</p>
<ol>
<li><strong>工作目录</strong>：磁盘上的实际文件。你在这里编辑。</li>
<li><strong>暂存区</strong>（索引）：你标记为下一次提交的文件。<code>git add</code> 将更改移到这里。</li>
<li><strong>本地仓库</strong>：你的提交历史，存储在 <code>.git/</code> 中。<code>git commit</code> 将暂存区保存为新的快照。</li>
<li><strong>远程仓库</strong>（例如 GitHub）：一个共享副本。<code>git push</code> 上传你的提交，<code>git pull</code> 下载他人的提交。</li>
</ol>
</li>
</ul>
<div class="highlight"><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a>Working Dir → git add → Staging → git commit → Local Repo → git push → Remote
<a id="__codelineno-0-2" name="__codelineno-0-2" href="#__codelineno-0-2"></a> ← git pull ←
</code></pre></div>
<ul>
<li>暂存区正是 Git 强大之处。你可以编辑 10 个文件，但只提交其中的 3 个，将其他更改保留给另一次提交。这使得清晰的、有重点的提交成为可能。</li>
</ul>
<h3 id="_2">基本命令<a class="headerlink" href="#_2" title="Permanent link">&para;</a></h3>
<div class="highlight"><pre><span></span><code><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a>git<span class="w"> </span>init<span class="w"> </span><span class="c1"># 创建新仓库</span>
<a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a>git<span class="w"> </span>clone<span class="w"> </span>url<span class="w"> </span><span class="c1"># 下载远程仓库</span>
<a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a>git<span class="w"> </span>status<span class="w"> </span><span class="c1"># 有什么变化？（最常用的命令）</span>
<a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a>git<span class="w"> </span>add<span class="w"> </span>file.py<span class="w"> </span><span class="c1"># 暂存特定文件</span>
<a id="__codelineno-1-5" name="__codelineno-1-5" href="#__codelineno-1-5"></a>git<span class="w"> </span>add<span class="w"> </span>.<span class="w"> </span><span class="c1"># 暂存所有更改（谨慎使用）</span>
<a id="__codelineno-1-6" name="__codelineno-1-6" href="#__codelineno-1-6"></a>git<span class="w"> </span>commit<span class="w"> </span>-m<span class="w"> </span><span class="s2">&quot;descriptive msg&quot;</span><span class="w"> </span><span class="c1"># 提交暂存的更改</span>
<a id="__codelineno-1-7" name="__codelineno-1-7" href="#__codelineno-1-7"></a>git<span class="w"> </span>push<span class="w"> </span><span class="c1"># 将提交上传到远程</span>
<a id="__codelineno-1-8" name="__codelineno-1-8" href="#__codelineno-1-8"></a>git<span class="w"> </span>pull<span class="w"> </span><span class="c1"># 下载并合并远程更改</span>
<a id="__codelineno-1-9" name="__codelineno-1-9" href="#__codelineno-1-9"></a>git<span class="w"> </span>log<span class="w"> </span>--oneline<span class="w"> </span><span class="c1"># 紧凑的提交历史</span>
<a id="__codelineno-1-10" name="__codelineno-1-10" href="#__codelineno-1-10"></a>git<span class="w"> </span>diff<span class="w"> </span><span class="c1"># 显示未暂存的更改</span>
<a id="__codelineno-1-11" name="__codelineno-1-11" href="#__codelineno-1-11"></a>git<span class="w"> </span>diff<span class="w"> </span>--staged<span class="w"> </span><span class="c1"># 显示已暂存的更改</span>
</code></pre></div>
<h2 id="_3">分支<a class="headerlink" href="#_3" title="Permanent link">&para;</a></h2>
<ul>
<li><strong>分支</strong>是指向一次提交的指针。默认分支是 <code>main</code>（或 <code>master</code>）。创建分支让你拥有独立的开发线：你可以在不影响 <code>main</code> 的情况下进行更改。</li>
</ul>
<div class="highlight"><pre><span></span><code><a id="__codelineno-2-1" name="__codelineno-2-1" href="#__codelineno-2-1"></a>git<span class="w"> </span>branch<span class="w"> </span>feature-x<span class="w"> </span><span class="c1"># 创建分支</span>
<a id="__codelineno-2-2" name="__codelineno-2-2" href="#__codelineno-2-2"></a>git<span class="w"> </span>checkout<span class="w"> </span>feature-x<span class="w"> </span><span class="c1"># 切换到此分支</span>
<a id="__codelineno-2-3" name="__codelineno-2-3" href="#__codelineno-2-3"></a>git<span class="w"> </span>checkout<span class="w"> </span>-b<span class="w"> </span>feature-x<span class="w"> </span><span class="c1"># 创建并切换（一步完成）</span>
<a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a>git<span class="w"> </span>branch<span class="w"> </span>-d<span class="w"> </span>feature-x<span class="w"> </span><span class="c1"># 删除分支（合并后）</span>
<a id="__codelineno-2-5" name="__codelineno-2-5" href="#__codelineno-2-5"></a>git<span class="w"> </span>branch<span class="w"> </span>-a<span class="w"> </span><span class="c1"># 列出所有分支（本地 + 远程）</span>
</code></pre></div>
<ul>
<li><strong>何时分支</strong>：始终需要。永远不要直接提交到 <code>main</code>。每个功能、错误修复或实验都有其自己的分支。这保持了 <code>main</code> 的稳定性和可部署性。</li>
</ul>
<h3 id="_4">分支策略<a class="headerlink" href="#_4" title="Permanent link">&para;</a></h3>
<ul>
<li>
<p><strong>功能分支</strong>（最常见）：每个功能/修复从 <code>main</code> 创建一个分支。完成后，打开拉取请求（PR）以合并回去。简单，适用于大多数团队。</p>
</li>
<li>
<p><strong>主干开发</strong>：开发人员频繁（每天多次）提交到 <code>main</code>，使用特性标记隐藏未完成的工作。持续部署的团队（Google、Facebook）更偏好这种方式。需要优秀的 CI/CD。</p>
</li>
<li>
<p><strong>Gitflow</strong>：为功能、发布和热修复设置单独的分支。更复杂，适用于有版本化发布的软件（移动应用、打包软件）。对大多数机器学习项目来说过于复杂。</p>
</li>
<li>
<p>对于机器学习团队：<strong>功能分支</strong>配合短生命周期的分支（1-3 天内合并）是最佳选择。生命周期长的分支会与 <code>main</code> 产生分歧，导致痛苦的合并冲突。</p>
</li>
</ul>
<h2 id="_5">合并与变基<a class="headerlink" href="#_5" title="Permanent link">&para;</a></h2>
<ul>
<li><strong>合并</strong>创建一个新的"合并提交"，将两个分支合并：</li>
</ul>
<div class="highlight"><pre><span></span><code><a id="__codelineno-3-1" name="__codelineno-3-1" href="#__codelineno-3-1"></a>git<span class="w"> </span>checkout<span class="w"> </span>main
<a id="__codelineno-3-2" name="__codelineno-3-2" href="#__codelineno-3-2"></a>git<span class="w"> </span>merge<span class="w"> </span>feature-x
</code></pre></div>
<ul>
<li>
<p>这保留了完整的历史记录：你可以看到工作是在分支上完成的，以及何时合并的。合并提交有两个父节点。</p>
</li>
<li>
<p><strong>变基</strong>在你的分支上重放提交到目标分支之上：</p>
</li>
</ul>
<div class="highlight"><pre><span></span><code><a id="__codelineno-4-1" name="__codelineno-4-1" href="#__codelineno-4-1"></a>git<span class="w"> </span>checkout<span class="w"> </span>feature-x
<a id="__codelineno-4-2" name="__codelineno-4-2" href="#__codelineno-4-2"></a>git<span class="w"> </span>rebase<span class="w"> </span>main
</code></pre></div>
<ul>
<li>
<p>这会重写历史：你的分支上的提交会获得新的哈希值，就好像你是从 <code>main</code> 的当前顶端开始工作一样。结果是线性的历史记录（没有合并提交），阅读起来更清晰。</p>
</li>
<li>
<p><strong>何时使用哪种</strong>：</p>
<ul>
<li><strong>变基</strong>用于使用最新的 <code>main</code> 更改更新你的功能分支（保持分支整洁和最新）。</li>
<li><strong>合并</strong>用于将你的功能分支集成到 <code>main</code>（保留分支历史）。</li>
<li><strong>永远不要变基已经推送并与他人共享</strong>的提交。变基会重写历史；如果其他人已经基于原始提交开展工作，变基会导致混乱。</li>
</ul>
</li>
</ul>
<h2 id="_6">解决冲突<a class="headerlink" href="#_6" title="Permanent link">&para;</a></h2>
<ul>
<li><strong>冲突</strong>发生在两个分支修改同一文件的同一行时。Git 无法自动决定保留哪个更改，需要你手动解决。</li>
</ul>
<div class="highlight"><pre><span></span><code><a id="__codelineno-5-1" name="__codelineno-5-1" href="#__codelineno-5-1"></a>&lt;&lt;&lt;&lt;&lt;&lt;&lt; HEAD
<a id="__codelineno-5-2" name="__codelineno-5-2" href="#__codelineno-5-2"></a>learning_rate = 0.001
<a id="__codelineno-5-3" name="__codelineno-5-3" href="#__codelineno-5-3"></a>=======
<a id="__codelineno-5-4" name="__codelineno-5-4" href="#__codelineno-5-4"></a>learning_rate = 0.0005
<a id="__codelineno-5-5" name="__codelineno-5-5" href="#__codelineno-5-5"></a>&gt;&gt;&gt;&gt;&gt;&gt;&gt; feature-x
</code></pre></div>
<ul>
<li>
<p><code>&lt;&lt;&lt;&lt;&lt;&lt;&lt; HEAD</code> 和 <code>=======</code> 之间是当前分支的版本。<code>=======</code> 和 <code>&gt;&gt;&gt;&gt;&gt;&gt;&gt; feature-x</code> 之间是传入分支的版本。你决定保留哪个（或组合它们），删除标记，保存，然后运行 <code>git add</code> 添加已解决的文件。</p>
</li>
<li>
<p><strong>陷阱</strong>：不要在已提交的文件中留下冲突标记。它们是会破坏你代码的字面文本。解决后始终搜索 <code>&lt;&lt;&lt;&lt;&lt;&lt;&lt;</code>。</p>
</li>
<li>
<p><strong>减少冲突</strong>：保持分支短生命周期，频繁将 <code>main</code> 合并到你的分支中，避免多人同时编辑同一个文件。</p>
</li>
</ul>
<h2 id="_7">编写良好的提交信息<a class="headerlink" href="#_7" title="Permanent link">&para;</a></h2>
<ul>
<li>
<p>提交信息是为了未来的你和你的队友。"修复错误"告诉不了你什么。"修复批次大小计算中的差一错误，该错误导致 8-GPU 训练时 OOM"告诉你一切。</p>
</li>
<li>
<p><strong>格式</strong>：</p>
</li>
</ul>
<div class="highlight"><pre><span></span><code><a id="__codelineno-6-1" name="__codelineno-6-1" href="#__codelineno-6-1"></a>简短摘要（50 字以内，祈使语气）
<a id="__codelineno-6-2" name="__codelineno-6-2" href="#__codelineno-6-2"></a>
<a id="__codelineno-6-3" name="__codelineno-6-3" href="#__codelineno-6-3"></a>如果需要，可附带更长的描述。解释 WHY，而不是 WHAT
<a id="__codelineno-6-4" name="__codelineno-6-4" href="#__codelineno-6-4"></a>（差异显示了什么改变了）。每行不超过 72 个字符。
<a id="__codelineno-6-5" name="__codelineno-6-5" href="#__codelineno-6-5"></a>
<a id="__codelineno-6-6" name="__codelineno-6-6" href="#__codelineno-6-6"></a>Fixes #123
</code></pre></div>
<ul>
<li>
<p><strong>祈使语气</strong>："添加功能"而不是"已添加功能"或"添加了功能"。将其视为完成句子："如果应用此提交，它将<strong>添加功能</strong>。"</p>
</li>
<li>
<p><strong>原子提交</strong>：每个提交应做一件事。"添加数据加载器"是一个提交。"添加数据加载器并修复无关的错误并更新 README"应该是三个提交。这使得 <code>git bisect</code>（找到哪个提交引入了错误）成为可能。</p>
</li>
</ul>
<h2 id="_8">拉取请求与代码审查<a class="headerlink" href="#_8" title="Permanent link">&para;</a></h2>
<ul>
<li>
<p><strong>拉取请求（PR）</strong>提议将一个分支合并到 <code>main</code>。它是代码审查的门户：队友阅读你的更改，提出改进建议，并在合并前批准。</p>
</li>
<li>
<p><strong>良好的 PR 实践</strong>：</p>
<ul>
<li>保持 PR 小（少于 400 行更改）。大的 PR 会被敷衍批准，因为没人想审查 2000 行。</li>
<li>编写清晰的描述：更改了什么、为什么以及如何测试。</li>
<li>链接到促使更改的问题或工单。</li>
<li>及时回复审查评论。</li>
<li>在合并前压缩琐碎的提交（这样 <code>main</code> 就有干净的历史记录）。</li>
</ul>
</li>
<li>
<p><strong>代码审查不是为了找错误</strong>（测试来做这个）。它的目的是：知识分享（审查者学习代码库）、设计反馈（这是正确的方法吗？）和维护标准（命名、风格、架构）。</p>
</li>
</ul>
<h2 id="gitignore">.gitignore<a class="headerlink" href="#gitignore" title="Permanent link">&para;</a></h2>
<ul>
<li><code>.gitignore</code> 文件告诉 Git 排除哪些文件不被追踪。对于机器学习项目：</li>
</ul>
<div class="highlight"><pre><span></span><code><a id="__codelineno-7-1" name="__codelineno-7-1" href="#__codelineno-7-1"></a># Python
<a id="__codelineno-7-2" name="__codelineno-7-2" href="#__codelineno-7-2"></a>__pycache__/
<a id="__codelineno-7-3" name="__codelineno-7-3" href="#__codelineno-7-3"></a>*.pyc
<a id="__codelineno-7-4" name="__codelineno-7-4" href="#__codelineno-7-4"></a>*.egg-info/
<a id="__codelineno-7-5" name="__codelineno-7-5" href="#__codelineno-7-5"></a>.venv/
<a id="__codelineno-7-6" name="__codelineno-7-6" href="#__codelineno-7-6"></a>env/
<a id="__codelineno-7-7" name="__codelineno-7-7" href="#__codelineno-7-7"></a>
<a id="__codelineno-7-8" name="__codelineno-7-8" href="#__codelineno-7-8"></a># 数据和模型（对 git 来说太大）
<a id="__codelineno-7-9" name="__codelineno-7-9" href="#__codelineno-7-9"></a>data/
<a id="__codelineno-7-10" name="__codelineno-7-10" href="#__codelineno-7-10"></a>*.csv
<a id="__codelineno-7-11" name="__codelineno-7-11" href="#__codelineno-7-11"></a>*.parquet
<a id="__codelineno-7-12" name="__codelineno-7-12" href="#__codelineno-7-12"></a>models/
<a id="__codelineno-7-13" name="__codelineno-7-13" href="#__codelineno-7-13"></a>*.pt
<a id="__codelineno-7-14" name="__codelineno-7-14" href="#__codelineno-7-14"></a>*.onnx
<a id="__codelineno-7-15" name="__codelineno-7-15" href="#__codelineno-7-15"></a>*.bin
<a id="__codelineno-7-16" name="__codelineno-7-16" href="#__codelineno-7-16"></a>checkpoints/
<a id="__codelineno-7-17" name="__codelineno-7-17" href="#__codelineno-7-17"></a>
<a id="__codelineno-7-18" name="__codelineno-7-18" href="#__codelineno-7-18"></a># 密钥
<a id="__codelineno-7-19" name="__codelineno-7-19" href="#__codelineno-7-19"></a>.env
<a id="__codelineno-7-20" name="__codelineno-7-20" href="#__codelineno-7-20"></a>*.pem
<a id="__codelineno-7-21" name="__codelineno-7-21" href="#__codelineno-7-21"></a>credentials.json
<a id="__codelineno-7-22" name="__codelineno-7-22" href="#__codelineno-7-22"></a>
<a id="__codelineno-7-23" name="__codelineno-7-23" href="#__codelineno-7-23"></a># IDE
<a id="__codelineno-7-24" name="__codelineno-7-24" href="#__codelineno-7-24"></a>.vscode/
<a id="__codelineno-7-25" name="__codelineno-7-25" href="#__codelineno-7-25"></a>.idea/
<a id="__codelineno-7-26" name="__codelineno-7-26" href="#__codelineno-7-26"></a>*.swp
<a id="__codelineno-7-27" name="__codelineno-7-27" href="#__codelineno-7-27"></a>
<a id="__codelineno-7-28" name="__codelineno-7-28" href="#__codelineno-7-28"></a># 操作系统
<a id="__codelineno-7-29" name="__codelineno-7-29" href="#__codelineno-7-29"></a>.DS_Store
<a id="__codelineno-7-30" name="__codelineno-7-30" href="#__codelineno-7-30"></a>Thumbs.db
<a id="__codelineno-7-31" name="__codelineno-7-31" href="#__codelineno-7-31"></a>
<a id="__codelineno-7-32" name="__codelineno-7-32" href="#__codelineno-7-32"></a># Jupyter
<a id="__codelineno-7-33" name="__codelineno-7-33" href="#__codelineno-7-33"></a>.ipynb_checkpoints/
<a id="__codelineno-7-34" name="__codelineno-7-34" href="#__codelineno-7-34"></a>
<a id="__codelineno-7-35" name="__codelineno-7-35" href="#__codelineno-7-35"></a># 实验输出
<a id="__codelineno-7-36" name="__codelineno-7-36" href="#__codelineno-7-36"></a>wandb/
<a id="__codelineno-7-37" name="__codelineno-7-37" href="#__codelineno-7-37"></a>mlruns/
<a id="__codelineno-7-38" name="__codelineno-7-38" href="#__codelineno-7-38"></a>outputs/
<a id="__codelineno-7-39" name="__codelineno-7-39" href="#__codelineno-7-39"></a>logs/
</code></pre></div>
<ul>
<li><strong>陷阱</strong>：在文件已被提交后将文件添加到 <code>.gitignore</code> 不会将其从仓库中移除。你还必须使用 <code>git rm --cached file</code> 来取消追踪。该文件会永远留在历史中，除非你重写历史（这很麻烦）。</li>
</ul>
<h2 id="git_1">Git 在机器学习中的应用<a class="headerlink" href="#git_1" title="Permanent link">&para;</a></h2>
<ul>
<li>
<p>机器学习引入了传统软件不面临的挑战：</p>
</li>
<li>
<p><strong>大文件</strong>：数据集和模型权重可能有数 GB 或更大。Git 是为文本文件（源代码）设计的，而不是二进制 blob。解决方案：</p>
<ul>
<li><strong>Git LFS</strong>（大文件存储）：在 Git 中追踪指针，将实际文件存储在单独的服务器上。简单，但在 GitHub 上有限制存储/带宽。</li>
<li><strong>DVC</strong>（数据版本控制）：将数据和模型文件与 Git 分开管理，使用远程存储（S3、GCS）。像 Git 一样用于数据：<code>dvc add data.csv</code>、<code>dvc push</code>、<code>dvc pull</code>。</li>
</ul>
</li>
<li>
<p><strong>实验追踪</strong>：哪个提交 + 哪些超参数 + 哪个数据产生了哪些指标？Git 追踪代码，但不追踪完整的实验上下文。</p>
<ul>
<li><strong>Weights &amp; Biases（W&amp;B）</strong>：记录指标、超参数、系统信息，并链接到 Git 提交。提供用于比较运行结果的仪表板。</li>
<li><strong>MLflow</strong>：开源的实验追踪，带有模型注册表。记录参数、指标和产物。</li>
<li><strong>简单方法</strong>：在你的训练脚本中记录 Git 哈希值：<code>git_hash = subprocess.check_output(['git', 'rev-parse', 'HEAD']).strip()</code>。将其与你的结果一起存储。</li>
</ul>
</li>
<li>
<p><strong>可重现性检查清单</strong>（每个实验需要追踪的内容）：</p>
<ul>
<li>Git 提交哈希值（确切的代码版本）</li>
<li>配置文件 / 超参数</li>
<li>随机种子</li>
<li>Python 和库版本（<code>pip freeze</code>）</li>
<li>数据版本（DVC 哈希值或数据集版本标签）</li>
<li>硬件（GPU 类型、GPU 数量）</li>
</ul>
</li>
</ul>
<div class="highlight"><pre><span></span><code><a id="__codelineno-8-1" name="__codelineno-8-1" href="#__codelineno-8-1"></a><span class="c1"># 快速可重现性快照</span>
<a id="__codelineno-8-2" name="__codelineno-8-2" href="#__codelineno-8-2"></a><span class="nb">echo</span><span class="w"> </span><span class="s2">&quot;Commit: </span><span class="k">$(</span>git<span class="w"> </span>rev-parse<span class="w"> </span>HEAD<span class="k">)</span><span class="s2">&quot;</span><span class="w"> </span>&gt;<span class="w"> </span>experiment_info.txt
<a id="__codelineno-8-3" name="__codelineno-8-3" href="#__codelineno-8-3"></a><span class="nb">echo</span><span class="w"> </span><span class="s2">&quot;Branch: </span><span class="k">$(</span>git<span class="w"> </span>branch<span class="w"> </span>--show-current<span class="k">)</span><span class="s2">&quot;</span><span class="w"> </span>&gt;&gt;<span class="w"> </span>experiment_info.txt
<a id="__codelineno-8-4" name="__codelineno-8-4" href="#__codelineno-8-4"></a><span class="nb">echo</span><span class="w"> </span><span class="s2">&quot;Dirty: </span><span class="k">$(</span>git<span class="w"> </span>status<span class="w"> </span>--porcelain<span class="w"> </span><span class="p">|</span><span class="w"> </span>wc<span class="w"> </span>-l<span class="k">)</span><span class="s2"> files&quot;</span><span class="w"> </span>&gt;&gt;<span class="w"> </span>experiment_info.txt
<a id="__codelineno-8-5" name="__codelineno-8-5" href="#__codelineno-8-5"></a>pip<span class="w"> </span>freeze<span class="w"> </span>&gt;&gt;<span class="w"> </span>experiment_info.txt
<a id="__codelineno-8-6" name="__codelineno-8-6" href="#__codelineno-8-6"></a>nvidia-smi<span class="w"> </span>&gt;&gt;<span class="w"> </span>experiment_info.txt
</code></pre></div>
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