feat: 完整中文翻译 maths-cs-ai-compendium（数学·计算机科学·AI 知识大全）

翻译自英文原版 maths-cs-ai-compendium，共 20 章全部完成。第01章向量 | 第02章矩阵 | 第03章微积分第04章统计学 | 第05章概率论 | 第06章机器学习第07章计算语言学 | 第08章计算机视觉 | 第09章音频与语音第10章多模态学习 | 第11章自主系统 | 第12章图神经网络第13章计算与操作系统 | 第14章数据结构与算法第15章生产级软件工程 | 第16章 SIMD与GPU编程第17章 AI推理 | 第18章 ML系统设计第19章应用人工智能 | 第20章前沿人工智能翻译说明： - 所有数学公式 $...$ / $$...$$、代码块、图片引用完整保留 - mkdocs.yml 配置中文导航 + language: zh - README.md 已翻译为中文（兼 docs/index.md） - docs/ 目录包含指向各章文件的 symlink - 约 29,000 行中文内容，排除 .cache/ 构建缓存
2026-05-03 10:23:20 +08:00
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+      <polygon points="0 0, 7 2.5, 0 5" fill="#9b59b6"/>
+    </marker>
+  </defs>
+  <text x="350" y="22" fill="#333" font-size="14" font-weight="bold" text-anchor="middle">U-Net: Encoder-Decoder with Skip Connections</text>
+
+  <!-- Encoder (left side, going down) -->
+  <text x="100" y="45" fill="#3498db" font-size="11" font-weight="bold" text-anchor="middle">Encoder</text>
+
+  <!-- Level 1 encoder -->
+  <rect x="40" y="55" width="120" height="35" rx="4" fill="#3498db" opacity="0.15" stroke="#3498db" stroke-width="1.5"/>
+  <text x="100" y="77" fill="#3498db" font-size="9" text-anchor="middle">Conv 64 (256²)</text>
+
+  <!-- Down arrow -->
+  <line x1="100" y1="90" x2="100" y2="108" stroke="#555" stroke-width="1" marker-end="url(#unet-arrow)"/>
+  <text x="115" y="103" fill="#e74c3c" font-size="7">↓ pool</text>
+
+  <!-- Level 2 encoder -->
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+  <text x="105" y="134" fill="#3498db" font-size="9" text-anchor="middle">Conv 128 (128²)</text>
+
+  <!-- Down arrow -->
+  <line x1="105" y1="147" x2="105" y2="165" stroke="#555" stroke-width="1" marker-end="url(#unet-arrow)"/>
+  <text x="120" y="160" fill="#e74c3c" font-size="7">↓ pool</text>
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+  <!-- Level 3 encoder -->
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+  <text x="110" y="192" fill="#3498db" font-size="9" text-anchor="middle">Conv 256 (64²)</text>
+
+  <!-- Down arrow -->
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+  <text x="125" y="218" fill="#e74c3c" font-size="7">↓ pool</text>
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+  <!-- Bottleneck -->
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+  <text x="350" y="253" fill="#f39c12" font-size="10" text-anchor="middle" font-weight="bold">Bottleneck: Conv 512 (32²)</text>
+  <line x1="110" y1="227" x2="230" y2="248" stroke="#555" stroke-width="1" marker-end="url(#unet-arrow)"/>
+
+  <!-- Decoder (right side, going up) -->
+  <text x="600" y="45" fill="#27ae60" font-size="11" font-weight="bold" text-anchor="middle">Decoder</text>
+
+  <!-- Level 3 decoder -->
+  <rect x="550" y="170" width="80" height="35" rx="4" fill="#27ae60" opacity="0.15" stroke="#27ae60" stroke-width="1.5"/>
+  <text x="590" y="192" fill="#27ae60" font-size="9" text-anchor="middle">Conv 256 (64²)</text>
+
+  <!-- Up arrow from bottleneck -->
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+  <text x="540" y="230" fill="#27ae60" font-size="7">↑ upsample</text>
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+  <!-- Level 2 decoder -->
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+  <text x="595" y="134" fill="#27ae60" font-size="9" text-anchor="middle">Conv 128 (128²)</text>
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+  <text x="615" y="162" fill="#27ae60" font-size="7">↑ up</text>
+
+  <!-- Level 1 decoder -->
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+  <text x="600" y="77" fill="#27ae60" font-size="9" text-anchor="middle">Conv 64 (256²)</text>
+
+  <!-- Up arrow -->
+  <line x1="595" y1="112" x2="600" y2="93" stroke="#555" stroke-width="1" marker-end="url(#unet-arrow)"/>
+  <text x="620" y="105" fill="#27ae60" font-size="7">↑ up</text>
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+  <text x="350" y="66" fill="#9b59b6" font-size="9" text-anchor="middle" font-weight="bold">skip (concat)</text>
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+  <text x="350" y="124" fill="#9b59b6" font-size="9" text-anchor="middle" font-weight="bold">skip (concat)</text>
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+  <text x="350" y="182" fill="#9b59b6" font-size="9" text-anchor="middle" font-weight="bold">skip (concat)</text>
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+  <!-- Output -->
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+  <text x="692" y="70" fill="#333" font-size="8" text-anchor="start">1×1</text>
+  <text x="692" y="80" fill="#333" font-size="8" text-anchor="start">conv</text>
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+  <!-- Bottom note -->
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+  <text x="350" y="300" fill="#333" font-size="10" text-anchor="middle">Skip connections concatenate encoder features with decoder features at each level.</text>
+</svg>