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<time title="创建时间：2020-07-31 12:04:08 / 修改时间：12:30:16" itemprop="dateCreated datePublished" datetime="2020-07-31T12:04:08+08:00">2020-07-31</time>
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<h1 id="高性能MySQL-笔记"><a href="#高性能MySQL-笔记" class="headerlink" title="高性能MySQL 笔记"></a>高性能MySQL 笔记</h1><h2 id="表"><a href="#表" class="headerlink" title="表"></a>表</h2><h3 id="列"><a href="#列" class="headerlink" title="列"></a>列</h3><h4 id="过多的列"><a href="#过多的列" class="headerlink" title="过多的列"></a>过多的列</h4><p>由于MySQL的存储层与通信层之间使用的缓冲格式是列缓冲的, 过多的列转行导致开销增大.</p><h3 id="范式"><a href="#范式" class="headerlink" title="范式"></a>范式</h3><ul>
<li>1NF: 列具有原子性, 不可拆分.</li>
<li>2NF: 在满足第一范式（1NF）的基础上, 每一个非码属性（不在主键中的列）都必须<strong>完全函数依赖于</strong> <em>候选码</em>. 若某些非主属性不依赖于候选码, 那么会不符合2NF.</li>
<li>3NF: 在满足第二范式（2NF）的基础上, 每个非主属性不依赖于其它非主属性, 即在2NF基础上，消除非码属性对候选码的传递函数依赖.(即所有非主属性对主属性直接依赖, 不能传递地依赖.)</li>
<li>BCNF: 非主属性不能对主属性部分依赖.</li>
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<time title="创建时间：2020-07-31 11:54:00 / 修改时间：12:27:45" itemprop="dateCreated datePublished" datetime="2020-07-31T11:54:00+08:00">2020-07-31</time>
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<h1 id="Java-Note"><a href="#Java-Note" class="headerlink" title="Java Note"></a>Java Note</h1><h2 id="I-虚拟机内存布局"><a href="#I-虚拟机内存布局" class="headerlink" title="I 虚拟机内存布局"></a>I 虚拟机内存布局</h2><h3 id="1-JVM运行时-内存布局"><a href="#1-JVM运行时-内存布局" class="headerlink" title="1. JVM运行时 内存布局"></a>1. JVM运行时 内存布局</h3><table>
<thead>
<tr>
<th>区域</th>
<th>作用</th>
<th>线程内存共享</th>
<th>异常</th>
<th>异常原因</th>
</tr>
</thead>
<tbody>
<tr>
<td>方法区</td>
<td>存放类型信息, 常量, 静态变量, JIT代码缓存.</td>
<td>线程共享</td>
<td>OOM</td>
<td>JVM规范规定, 无法满足内存分配时可抛出.</td>
</tr>
<tr>
<td>虚拟机栈</td>
<td>存储局部变量, 操作数栈, 动态链接, 接口等.</td>
<td>线程私有</td>
<td>OOM, SO</td>
<td>SO: 栈深度超出JVM允许范围;<br>OOM: 栈扩展失败导致的内存分配不足.</td>
</tr>
<tr>
<td>本地方法栈</td>
<td>与虚拟机栈功能相同, 但是对象是本地方法(Native Method).</td>
<td>线程私有</td>
<td>OOM, SO</td>
<td>同上.</td>
</tr>
<tr>
<td>堆</td>
<td>绝大部分对象在此存储(除了栈上分配和标量替换的对象).</td>
<td>共享/私有(TLAB)</td>
<td>OOM</td>
<td>堆中无法完成实例分配时抛出.</td>
</tr>
<tr>
<td>PC计数器</td>
<td>下一条指令的地址</td>
<td>线程私有</td>
<td>无</td>
<td>无</td>
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<h1 id="对批判性思维的几点见解"><a href="#对批判性思维的几点见解" class="headerlink" title="对批判性思维的几点见解"></a>对批判性思维的几点见解</h1><h2 id="论点的结构"><a href="#论点的结构" class="headerlink" title="论点的结构"></a>论点的结构</h2><p>对于接触到的大部分论点/结构/观点, 需要对其内核进行分析.</p><p>大部分情况下, 一个<strong>完整</strong>的观点是由</p><p><strong>论题 —— 论据(原因/理由) —— 结论(结果) —— 立场(价值观)</strong></p><p>组成.</p><p>一般情况下, 论点和论据会显式地给出. 而论题和立场可能需要进行推断.</p>
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<h2 id="前言"><a href="#前言" class="headerlink" title="前言"></a>前言</h2><blockquote>
<p>面向已经掌握了C++11之前的同学, 本文只列举了基本的几条.</p>
<p>ref: Effective Modern C++</p>
</blockquote><h2 id="用auto-代替显示声明"><a href="#用auto-代替显示声明" class="headerlink" title="用auto 代替显示声明."></a>用<strong>auto</strong> 代替显示声明.</h2><p>✘ 错误示范:</p><figure class="highlight c++"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">typename</span> <span class="built_in">std</span>::iterator_traits<It>::value_type currValue = *b;</span><br></pre></td></tr></table></figure>
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<h1 id="收入预测"><a href="#收入预测" class="headerlink" title="收入预测"></a>收入预测</h1><blockquote>
<p>通过 职位、婚姻情况、学历、家庭角色、种族、性别对其进行年薪的预测🥳🥳</p>
</blockquote><h2 id="Data-Set"><a href="#Data-Set" class="headerlink" title="Data Set"></a>Data Set</h2><p><a href="https://github.com/VIXNESS/machine-learning-course/blob/master/winner/train.csv" target="_blank" rel="noopener">Training Data</a></p><p><a href="https://github.com/VIXNESS/machine-learning-course/blob/master/winner/test.csv" target="_blank" rel="noopener">Testing Data</a></p><h2 id="预备工作"><a href="#预备工作" class="headerlink" title="预备工作"></a>预备工作</h2><h3 id="所需类库"><a href="#所需类库" class="headerlink" title="所需类库"></a>所需类库</h3><figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> tensorflow <span class="keyword">as</span> tf</span><br><span class="line"><span class="keyword">from</span> tensorflow <span class="keyword">import</span> keras</span><br><span class="line"><span class="keyword">import</span> numpy <span class="keyword">as</span> np</span><br><span class="line"><span class="keyword">import</span> sys</span><br><span class="line"><span class="keyword">import</span> csv</span><br></pre></td></tr></table></figure>
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<h1 id="使用Linear-Regression-对PM2-5进行预测"><a href="#使用Linear-Regression-对PM2-5进行预测" class="headerlink" title="使用Linear Regression 对PM2.5进行预测"></a>使用Linear Regression 对PM2.5进行预测</h1><h2 id="数据集"><a href="#数据集" class="headerlink" title="数据集"></a>数据集</h2><blockquote>
<p><a href="https://github.com/VIXNESS/machine-learning-course/blob/master/pm25_predict/train.csv" target="_blank" rel="noopener">training data</a></p>
<p><a href="https://github.com/VIXNESS/machine-learning-course/blob/master/pm25_predict/test.csv" target="_blank" rel="noopener">testing data: samples</a></p>
<p><a href="https://github.com/VIXNESS/machine-learning-course/blob/master/pm25_predict/ans.csv" target="_blank" rel="noopener">testing data: label</a></p>
<p>Training data 和 Public testing data 的组织形式:</p>
<p>一天由18行组成,一行为一个指标,一共由18个指标,从第4列开始记录每个指标一天内24小时的变化数值,每个月连续记录前20天作为training set,后10天作为testing set,一共记录了240个小时</p>
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