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<a href="/2022/12/20/MacTransErr/" class="post-title-link" itemprop="url">Mac 浏览器 自带的翻译出现 “翻译暂时不可用”的情况</a>
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<time title="创建时间：2022-12-20 20:44:05 / 修改时间：20:48:12" itemprop="dateCreated datePublished" datetime="2022-12-20T20:44:05+08:00">2022-12-20</time>
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<p>最近开启代理时Safari浏览器自带的翻译出现了“翻译暂时不可用”的情况.</p>
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<a href="/2022/04/28/arap-2/" class="post-title-link" itemprop="url">Implementing As-Rigid-As-Possible Shape Manipulation</a>
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<h2 id="intro">Intro</h2>
<p>作者在发表ARAP后，于2009年又发表一篇基于ARAP实现上的<a href="">改进工作</a>。使实现变得更简洁通用。其中主要有两个主要改进。</p>
<ul>
<li>使用<strong>边</strong>为变形的基本单位。提高了代码的简洁性。</li>
<li>控制形变交互时，无需点击三角化后图像上的顶点，点击其中任意坐标即可。</li>
</ul>
<p>和ARAP一样，算法的目标是在形变过程中，变换尽可能刚性，最小化每个三角形的扭曲。由于是一个非线性问题，得不到问题的解析解，所以作者将一个非线性优化问题近似分解为一系列的线性问题。 第一步允许旋转和平移，以及一致缩放(uniform scaling),惩罚非一致性缩放。第二步将第一步得到的结果通过进行自由平移得到最终的结果。这时惩罚旋转，和缩放。</p>
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<a href="/2022/04/20/arap/" class="post-title-link" itemprop="url">ARAP--As rigid as possible</a>
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<time title="创建时间：2022-04-20 22:27:15" itemprop="dateCreated datePublished" datetime="2022-04-20T22:27:15+08:00">2022-04-20</time>
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<time title="修改时间：2022-12-20 20:42:00" itemprop="dateModified" datetime="2022-12-20T20:42:00+08:00">2022-12-20</time>
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<h2 id="intro">Intro</h2>
<p>用数学的方法去变形。</p>
<h2 id="motivation">Motivation</h2>
<p>就像论文的名字一样，实现尽可能刚性的形状操纵，什么是刚性形变？刚性形变：仅包含<strong>平移和旋转</strong>的几何变换， 什么物体在刚性形变过后都保持同样的大小和形状。 所以该论文在对形状进行操纵后形变效果相比于原始的图形，尽可能<strong>保持了原始的图形的形状</strong>。</p>
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<p>把这个网站重新用起来的动机，是感觉自己明明做了很多，但总觉得什么都没做。所以计划强迫自己记录下来，以防自己真的什么都没干。</p>
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<p>作者针对StyleGAN遗留的问题，对模型进行了修改，进一步提高的生成图像的质量。</p>
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<h1 id="stylegan">StyleGAN</h1>
<h2 id="引言">引言</h2>
<ul>
<li>最近做的项目，基本上是基于这个的。现在做的差不多，做一个记录。也算是一个总结。</li>
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<h2 id="stylegan-1">StyleGAN</h2>
<p>论文：arxiv, <a target="_blank" rel="noopener" href="https://arxiv.org/abs/1812.04948">A Style-Based Generator Architecture for Generative Adversarial Networks</a></p>
<p>code: <a target="_blank" rel="noopener" href="https://github.com/NVlabs/stylegan">A Style-Based Generator Architecture for Generative Adversarial Networks</a></p>
<p>可以先看下StyleGAN具体的效果，由程序生成的照片的和真实世界拍摄的照片，仅凭肉眼是很难区分的。</p>
<p><a target="_blank" rel="noopener" href="https://github.com/NVlabs/stylegan/blob/master/stylegan-teaser.png"><img src="https://raw.githubusercontent.com/suchot/blog-pic-bed/master/stylegan-teaser.png" /></a></p>
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<p>记录一些 hexo 基本操作</p>
<p><a target="_blank" rel="noopener" href="https://hexo.bootcss.com/docs/">Hexo 文档</a></p>
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<h2 id="选择题知识点">选择题知识点</h2>
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<li>OSL估计</li>
<li>过拟合
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<h2 id="决策树模型概述">决策树模型概述</h2>
<p>决策树模型是表示基于特征对实例进行分类的树形结构，决策树可以转换为一个if-then规则的集合，也可以看作是定义在特征空间划分上的类的条件概率分布。</p>
<p>但是直接从可能的决策树中直接选取最优的决策树是<strong>NP完全问题</strong>现实中利用<strong>启发式方法</strong>学习次优的决策树。</p>
<p>决策树学习算法包括三部分 * 特征选择： 选取对训练数据能够分类的特征 * 树的生成： 通常用特征选择准则(信息增益，信息增益率，基尼指数), 从根节点开始，递归的产生决策树。这相当于用上述指标不断地选取局部最优特征，或将训练集分割为能够基本正确分类的子集。 * 树的剪枝： 由于生成的决策树存在过拟合问题，需要对其进行剪枝，</p>
<p>常用的决策树算法有ID3，C4.5，CART
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<p>从上一篇中，我们了解了强化学习的一些重要的基本概念： <strong>马尔可夫决策过程</strong>，<strong>贝尔曼方程</strong> 等等。 为了理解Deep Q-Learning，需要先学习这些 <a href="https://suchot.github.io/2018/10/30/RL/">基本概念</a>。</p>
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