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<a class="article-title" href="/2018/11/26/G52CPP/">G52CPP复习</a>
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<a href="/2018/11/26/G52CPP/" class="archive-article-date">
<time datetime="2018-11-25T19:27:27.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2018-11-26</time>
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<h2 id="G52CPP"><a href="#G52CPP" class="headerlink" title="G52CPP"></a>G52CPP</h2><hr>
<h3 id="Lecture-1-amp-2"><a href="#Lecture-1-amp-2" class="headerlink" title="Lecture 1 & 2"></a>Lecture 1 & 2</h3><h5 id="Header"><a href="#Header" class="headerlink" title="Header"></a>Header</h5><figure class="highlight cpp"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div></pre></td><td class="code"><pre><div class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><stdio.h></span> <span class="comment">// C or C++</span></span></div><div class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string"><cstdio></span> <span class="comment">// C++</span></span></div></pre></td></tr></table></figure>
<p>reference 省去 copy的过程<br>What is usually in a header file?</p>
<ol>
<li>Function declarations</li>
<li>Macro definitions (#define)</li>
<li>Constant definitions</li>
<li>Possibly other things as well<blockquote>
<ol>
<li>Ensure that the header file #includes everything that it needs itself</li>
<li>Ensure that it doesn’t matter if the header file is #included multiple times</li>
<li>Ensure that header files can be included in any order</li>
</ol>
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<article id="post-PyCharm运行TensorBoard时的小BUG" class="article article-type-post article-index" itemscope itemprop="blogPost">
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<a class="article-title" href="/2018/02/21/PyCharm运行TensorBoard时的小BUG/">PyCharm运行TensorBoard时的小BUG</a>
</h1>
<a href="/2018/02/21/PyCharm运行TensorBoard时的小BUG/" class="archive-article-date">
<time datetime="2018-02-21T08:03:41.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2018-02-21</time>
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<h2 id="PyCharm运行TensorBoard时的小BUG"><a href="#PyCharm运行TensorBoard时的小BUG" class="headerlink" title="PyCharm运行TensorBoard时的小BUG"></a>PyCharm运行TensorBoard时的小BUG</h2><p>@(G53IDS)[PyCharm, TensorBoard, BUG]<br>今天在PyCharm的Terminal使用TensorBoard的时候出现了以下报错，但是mac自带的terminal却可以正常使用：</p>
<figure class="highlight vhdl"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div></pre></td><td class="code"><pre><div class="line"># tensorboard <span class="comment">--logdir=logs</span></div><div class="line">Traceback (most recent call last):</div><div class="line"> <span class="keyword">File</span> <span class="string">"/Users/baron/.pyenv/versions/3.6.3/bin/tensorboard"</span>, <span class="literal">line</span> <span class="number">11</span>, <span class="keyword">in</span> <module></div><div class="line"> sys.<span class="keyword">exit</span>(main())</div><div class="line"> <span class="keyword">File</span> <span class="string">"/Users/baron/.pyenv/versions/3.6.3/lib/python3.6/site-packages/tensorboard/main.py"</span>, <span class="literal">line</span> <span class="number">45</span>, <span class="keyword">in</span> main</div><div class="line"> <span class="keyword">default</span>.get_assets_zip_provider())</div><div class="line"> <span class="keyword">File</span> <span class="string">"/Users/baron/.pyenv/versions/3.6.3/lib/python3.6/site-packages/tensorboard/program.py"</span>, <span class="literal">line</span> <span class="number">147</span>, <span class="keyword">in</span> main</div><div class="line"> util.setup_logging()</div><div class="line"> <span class="keyword">File</span> <span class="string">"/Users/baron/.pyenv/versions/3.6.3/lib/python3.6/site-packages/tensorboard/util.py"</span>, <span class="literal">line</span> <span class="number">50</span>, <span class="keyword">in</span> setup_logging</div><div class="line"> locale.setlocale(locale.LC_ALL, '')</div><div class="line"> <span class="keyword">File</span> <span class="string">"/Users/baron/.pyenv/versions/3.6.3/lib/python3.6/locale.py"</span>, <span class="literal">line</span> <span class="number">598</span>, <span class="keyword">in</span> setlocale</div><div class="line"> <span class="keyword">return</span> _setlocale(category, locale)</div><div class="line">locale.<span class="literal">Error</span>: unsupported locale setting</div></pre></td></tr></table></figure>
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<a class="article-title" href="/2017/11/26/Hexo以及yilia主题个性化设置/">Hexo以及yilia主题个性化设置</a>
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<h1 id="Hexo以及yilia主题个性化设置"><a href="#Hexo以及yilia主题个性化设置" class="headerlink" title="Hexo以及yilia主题个性化设置"></a>Hexo以及yilia主题个性化设置</h1><h3 id="修改浏览器Tab里的icon"><a href="#修改浏览器Tab里的icon" class="headerlink" title="修改浏览器Tab里的icon"></a>修改浏览器Tab里的icon</h3><p>修改后效果如下<br><img src="https://app.yinxiang.com/shard/s67/res/b7a1bfae-d09c-4a00-be66-a474d57e6378/20171123140602_rXDDHa_Screenshot.jpg" alt="aaaaa"></p>
<ul>
<li>很简单我们只需要在yilia主题里<code>_config.yml</code>文件里修改为<code>favicon: /img/favicon.ico</code></li>
<li>将自己想要的icon，转换成<code>.ico</code>格式修改命名放在<code>yilia/sourse/img</code>里，大功告成</li>
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<h1 id="TensorFlow"><a href="#TensorFlow" class="headerlink" title="TensorFlow"></a>TensorFlow</h1><h2 id="配置环境"><a href="#配置环境" class="headerlink" title="配置环境"></a>配置环境</h2><p>我的环境是 macOS Sierra 10.12.6，其他mac版本应该也适用。</p>
<h3 id="pyenv"><a href="#pyenv" class="headerlink" title="pyenv"></a>pyenv</h3><p>安装<a href="https://github.com/pyenv/pyenv">pyenv</a> 管理多版本 python，通过它安装 python。原因是不希望污染mac自带系统python。详细过程参考官方doc，这里描述一下我的安装过程。</p>
<iframe frameborder="no" border="0" marginwidth="0" marginheight="0" width=330 height=86 src="//music.163.com/outchain/player?type=2&id=518894283&auto=1&height=66"></iframe>
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<ol>
<li>安装：</li>
</ol>
<figure class="highlight elixir"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div></pre></td><td class="code"><pre><div class="line"><span class="comment"># 使用git安装</span></div><div class="line"><span class="variable">$ </span>git clone <span class="symbol">https:</span>/<span class="regexp">/github.com/pyenv</span><span class="regexp">/pyenv.git ~/</span>.pyenv</div><div class="line"><span class="comment"># 使用Homebrew on Mac OS X 安装</span></div><div class="line"><span class="variable">$ </span>brew update</div><div class="line"><span class="variable">$ </span>brew install pyenv</div></pre></td></tr></table></figure>
<p>没有<a href="https://brew.sh/" title="Homebrew">Homebrew</a>请安装并更新<br>
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<a class="article-title" href="/2017/05/03/Deadlocks/">笔记 OSC_Deadlocks</a>
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<h1 id="Deadlocks"><a href="#Deadlocks" class="headerlink" title="Deadlocks"></a>Deadlocks</h1><hr>
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<li>Deadlocks and <strong>conditions for deadlocks</strong> </li>
<li>Algorithms to <strong>detect[探知] deadlocks</strong><br>Approaches to <strong>recover</strong> from deadlocks
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<a class="article-title" href="/2017/02/06/N和NP问题/">拓展 N和NP问题</a>
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<h1 id="N和NP问题"><a href="#N和NP问题" class="headerlink" title="N和NP问题"></a>N和NP问题</h1><blockquote>
<p>“P” refers to the class of problems that can be solved in polynomial time<br>“NP” refers to problems that can be solved in non- deterministic polynomial time</p>
</blockquote>
<ul>
<li>P是能在多项式时间内<strong>解决</strong>的问题，</li>
<li>NP是能在多项式时间<strong>验证答案正确与否</strong>的问题。</li>
</ul>
<p>用大白话讲大概就是这样。P是否等于NP实质上就是在问，如果对于一个问题我能在多项式时间内验证其答案的正确性，那么我是否能在多项式时间内解决它？这个表述不太严谨，但通俗来讲就是如此。(2014, Wang)</p>
<h4 id="什么是-polynomial-time？"><a href="#什么是-polynomial-time？" class="headerlink" title="什么是 polynomial time？"></a>什么是 polynomial time？</h4><ul>
<li>多项式级的复杂度：O(1),O(log(n)),O(n^a)等，因为它的规模n出现在底数的位置；</li>
<li>非多项式级的复杂度：O(a^n)和O(n!)型复杂度，其复杂度计算机往往不能承受。</li>
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<a class="article-title" href="/2017/01/09/Concurrency2/">笔记 OSC_Concurrency2</a>
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<h1 id="Concurrency-2"><a href="#Concurrency-2" class="headerlink" title="Concurrency 2"></a>Concurrency 2</h1><hr>
<h2 id="Overview"><a href="#Overview" class="headerlink" title="Overview"></a>Overview</h2><ul>
<li><strong>Software approaches</strong>: Peterson’s solution Hardware approaches:</li>
<li><strong>Disabling interrupts</strong>:<ul>
<li><code>test_and_set()</code></li>
<li><code>compare_and_swap()</code></li>
</ul>
</li>
<li>Higher level approaches include <strong>mutexes</strong> and <strong>semaphores</strong><h3 id="Peterson’s-Solution"><a href="#Peterson’s-Solution" class="headerlink" title="Peterson’s Solution"></a>Peterson’s Solution</h3></li>
<li>Peterson’s solution is a <strong>software based solution</strong> which worked well for <strong>older machines</strong></li>
<li>Two <strong>shared variables</strong> are used:<ul>
<li>turn: indicates <strong>which process is next</strong> to enter its critical section </li>
<li>boolean flag[2]: indicates that a <strong>process is ready</strong> to enter its critical section</li>
</ul>
</li>
<li>It is restricted[限制] to <strong>two processes</strong> that execute in <strong>strict alternation</strong>[严格的交替]<figure class="highlight sqf"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">do</span> {</div><div class="line"> <span class="built_in">flag</span>[j] = <span class="literal">true</span>; <span class="comment">// j wants to enter critical section turn = i; // allow i to access first</span></div><div class="line"> <span class="keyword">while</span> (<span class="built_in">flag</span>[i] && turn == i);</div><div class="line"> <span class="comment">// whilst i wants to access critical section</span></div><div class="line"> <span class="comment">// and its i’s turn, apply busy waiting </span></div><div class="line"> </div><div class="line"> <span class="comment">// CRITICAL SECTION</span></div><div class="line"> </div><div class="line"> <span class="built_in">flag</span>[j] = <span class="literal">false</span>;</div><div class="line"> <span class="comment">// remainder section</span></div><div class="line">} <span class="keyword">while</span> (...);</div></pre></td></tr></table></figure>
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<a class="article-title" href="/2017/01/09/Concurrency1/">笔记 OSC_Concurrency1</a>
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<h1 id="Concurrency-1"><a href="#Concurrency-1" class="headerlink" title="Concurrency 1"></a>Concurrency 1</h1><hr>
<h2 id="Overview"><a href="#Overview" class="headerlink" title="Overview"></a>Overview</h2><ul>
<li>Examples of <strong>concurrency issues</strong> (e.g. counter++)</li>
<li>Root causes of <strong>concurrency issues</strong></li>
<li><strong>Critical sections</strong> and <strong>mutual exclusion</strong> </li>
<li><strong>Requirements and approaches</strong> for mutual exclusion</li>
</ul>
<h3 id="Concurrency"><a href="#Concurrency" class="headerlink" title="Concurrency"></a>Concurrency</h3><ul>
<li>Threads and processes execute concurrently or in parallel and can share resources<ul>
<li>Multiprogramming/multiprocessing <strong>improves system utilisation</strong></li>
</ul>
</li>
<li>A process/thread can be <strong>interrupted at any point in time</strong> (I/O, timer)<ul>
<li>The process “state” is <strong>saved</strong> in the p<strong>rocess control block</strong> </li>
</ul>
</li>
<li>The outcome of programs may become <strong>unpredictable</strong>[不可预知的]<ul>
<li>Sharing data can lead to <strong>inconsistencies</strong>[矛盾]</li>
<li>I.e., the <strong>outcome of execution</strong> may <strong>depend on the order</strong> win which instructions are carried out</li>
</ul>
</li>
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