add K-Nearest Neighbors details
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# MathJax
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# MathJax
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mathjax:
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mathjax:
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enable: false
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enable: true
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per_page: false
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per_page: false
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# KaTeX
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# KaTeX
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@ -153,15 +153,15 @@
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}
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}
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}
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}
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detectApple()
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detectApple()
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<i class="fas fa-folder-open"></i>
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<i class="fas fa-folder-open"></i>
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<span>分类</span>
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<span>分类</span>
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</div>
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</div>
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|
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POWERMODE.shake = true;
|
POWERMODE.shake = true;
|
||||||
POWERMODE.mobile = false;
|
POWERMODE.mobile = false;
|
||||||
document.body.addEventListener('input', POWERMODE);
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document.body.addEventListener('input', POWERMODE);
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@ -54,7 +54,7 @@
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||||||
isHome: true,
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isHome: true,
|
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isHighlightShrink: undefined,
|
isHighlightShrink: undefined,
|
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isToc: false,
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isToc: false,
|
||||||
postUpdate: '2024-12-24 18:32:08'
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postUpdate: '2025-01-13 17:33:56'
|
||||||
}</script><script>(win=>{
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}</script><script>(win=>{
|
||||||
win.saveToLocal = {
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win.saveToLocal = {
|
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set: (key, value, ttl) => {
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set: (key, value, ttl) => {
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@ -151,7 +151,41 @@
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}
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}
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}
|
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detectApple()
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detectApple()
|
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})(window)</script><meta name="generator" content="Hexo 7.3.0"></head><body><div id="web_bg"></div><div id="sidebar"><div id="menu-mask"></div><div id="sidebar-menus"><div class="avatar-img is-center"><img src="/img/avatar.jpg" onerror="onerror=null;src='/img/friend_404.gif'" alt="avatar"/></div><div class="sidebar-site-data site-data is-center"><a href="/archives/"><div class="headline">文章</div><div class="length-num">12</div></a><a href="/tags/"><div class="headline">标签</div><div class="length-num">3</div></a><a href="/categories/"><div class="headline">分类</div><div class="length-num">1</div></a></div><hr class="custom-hr"/><div class="menus_items"><div class="menus_item"><a class="site-page" href="/"><i class="fa-fw fas fa-home"></i><span> Home</span></a></div><div class="menus_item"><a class="site-page" href="/archives/"><i class="fa-fw fas fa-archive"></i><span> Archives</span></a></div><div class="menus_item"><a class="site-page" href="/tags/"><i class="fa-fw fas fa-tags"></i><span> Tags</span></a></div><div class="menus_item"><a class="site-page" href="/categories/"><i class="fa-fw fas fa-folder-open"></i><span> Categories</span></a></div><div class="menus_item"><a class="site-page group" href="javascript:void(0);"><i class="fa-fw fas fa-list"></i><span> List</span><i class="fas fa-chevron-down"></i></a><ul class="menus_item_child"><li><a class="site-page child" href="/music/"><i class="fa-fw fas fa-music"></i><span> Music</span></a></li><li><a class="site-page child" href="/movies/"><i class="fa-fw fas fa-video"></i><span> Movie</span></a></li></ul></div><div class="menus_item"><a class="site-page" href="/link/"><i class="fa-fw fas fa-link"></i><span> Link</span></a></div><div class="menus_item"><a class="site-page" href="/about/"><i class="fa-fw fas fa-heart"></i><span> About</span></a></div></div></div></div><div class="page" id="body-wrap"><header class="full_page fixed" id="page-header" style="background-image: url('/img/site01.jpg')"><nav id="nav"><span id="blog-info"><a href="/" title="QuickReference"><span class="site-name">QuickReference</span></a></span><div id="menus"><div id="search-button"><a class="site-page social-icon search" href="javascript:void(0);"><i class="fas fa-search fa-fw"></i><span> 搜索</span></a></div><div class="menus_items"><div class="menus_item"><a class="site-page" href="/"><i class="fa-fw fas fa-home"></i><span> Home</span></a></div><div class="menus_item"><a class="site-page" href="/archives/"><i class="fa-fw fas fa-archive"></i><span> Archives</span></a></div><div class="menus_item"><a class="site-page" href="/tags/"><i class="fa-fw fas fa-tags"></i><span> Tags</span></a></div><div class="menus_item"><a class="site-page" href="/categories/"><i class="fa-fw fas fa-folder-open"></i><span> Categories</span></a></div><div class="menus_item"><a class="site-page group" href="javascript:void(0);"><i class="fa-fw fas fa-list"></i><span> List</span><i class="fas fa-chevron-down"></i></a><ul class="menus_item_child"><li><a class="site-page child" href="/music/"><i class="fa-fw fas fa-music"></i><span> Music</span></a></li><li><a class="site-page child" href="/movies/"><i class="fa-fw fas fa-video"></i><span> Movie</span></a></li></ul></div><div class="menus_item"><a class="site-page" href="/link/"><i class="fa-fw fas fa-link"></i><span> Link</span></a></div><div class="menus_item"><a class="site-page" href="/about/"><i class="fa-fw fas fa-heart"></i><span> About</span></a></div></div><div id="toggle-menu"><a class="site-page" href="javascript:void(0);"><i class="fas fa-bars fa-fw"></i></a></div></div></nav><div id="site-info"><h1 id="site-title">QuickReference</h1><div id="site-subtitle"><span id="subtitle"></span></div><div id="site_social_icons"><a class="social-icon" href="https://github.com/shenjianZ" target="_blank" title="Github"><i class="fab fa-github" style="color: #24292e;"></i></a><a class="social-icon" href="mailto:15202078626@163.com" target="_blank" title="Email"><i class="fas fa-envelope" style="color: #4a7dbe;"></i></a></div></div><div id="scroll-down"><i class="fas fa-angle-down scroll-down-effects"></i></div></header><main class="layout" id="content-inner"><div class="recent-posts" id="recent-posts"><div class="recent-post-item"><div class="recent-post-info no-cover"><a class="article-title" href="/posts/61251.html" title="Hadoop集群Zookeeper配置">Hadoop集群Zookeeper配置</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2024-09-11T14:45:40.000Z" title="发表于 2024-09-11 22:45:40">2024-09-11</time></span></div><div class="content">Zookeeper脚本配置
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|
||||||
|
距离公式(2维)
|
||||||
|
欧式距离$$d = \sqrt{(x_1-y_1)^2 + (x_2 - y_2)^2}$$
|
||||||
|
曼哈顿距离$$d = |x_1 - x_2| + |y_1 - y_2|$$
|
||||||
|
切比雪夫距离$$d = \max\left(|x_1 - x_2|, |y_1 - y_2|\right)$$
|
||||||
|
|
||||||
|
k值选择问题
|
||||||
|
|
||||||
|
|
||||||
|
k值
|
||||||
|
影响
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
|
越大
|
||||||
|
模型过拟合，准确率波动较大
|
||||||
|
|
||||||
|
|
||||||
|
越小
|
||||||
|
模型欠拟合，准确率趋于稳定但可能较低
|
||||||
|
|
||||||
|
|
||||||
|
特征预处理
|
||||||
|
通过一些转换函数将特征数据转换成更加适合算法模型的特征数据过程
|
||||||
|
|
||||||
|
|
||||||
|
归一化将数据变换到指定区间（默认是[0,1]）$$ x’ = \frac{x- x_{\text {min}}}{x_{\text{max}} - x_{\text{min}}} $$若需要缩放到任意区间 ([a, b])，公式为： $$ x’ = a + \frac{(x - x_{\text{min}}) \cdot (b - a ...</div></div></div><div class="recent-post-item"><div class="recent-post-info no-cover"><a class="article-title" href="/posts/61253.html" title="Hadoop集群搭建基础环境">Hadoop集群搭建基础环境</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2024-09-11T14:45:40.000Z" title="发表于 2024-09-11 22:45:40">2024-09-11</time></span></div><div class="content">防火墙关闭123# 在 6 台主机执行systemctl stop firewalldsystemctl disable firewalld
|
||||||
|
配置yum源
|
||||||
|
下载 repo 文件：Centos-7.repo并上传到/tmp，进入到/tmp
|
||||||
|
备份并且替换系统的repo文件1234 cp Centos-7.repo /etc/yum.repos.d/ cd /etc/yum.repos.d/ mv CentOS-Base.repo CentOS-Base.repo.bak mv Centos-7.repo CentOS-Base.repo
|
||||||
|
将nn1上的CentOS-Base.repo拷贝到其他主机12345scp /etc/yum.repos.d/CentOS-Base.repo root@nn2:/etc/yum.repos.dscp /etc/yum.repos.d/CentOS-Base.repo root@nn3:/etc/yum.repos.dscp /etc/yum.repos.d/CentOS-Base.repo root@s1:/etc/yum.repos.dscp /et ...</div></div></div><div class="recent-post-item"><div class="recent-post-info no-cover"><a class="article-title" href="/posts/61252.html" title="Hadoop集群HDFS配置">Hadoop集群HDFS配置</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2024-09-11T14:45:40.000Z" title="发表于 2024-09-11 22:45:40">2024-09-11</time></span></div><div class="content">上传hadoop-3.1.4.tar.gz到/tmp，解压
|
||||||
|
注意在六台机器均上传到/tmp
|
||||||
|
|
||||||
|
12345# 在6台机器执行sudo tar -zxvf /tmp/hadoop-3.1.4.tar.gz -C /usr/local/# 分发到其他主机ssh_root.sh chown -R hadoop:hadoop /usr/local/hadoop-3.1.4ssh_root.sh ln -s /usr/local/hadoop-3.1.4/ /usr/local/hadoop
|
||||||
|
配置环境变量123echo 'export HADOOP_HOME=/usr/local/hadoop' >> /etc/profile.d/myEnv.shecho 'export PATH=$PATH:$HADOOP_HOME/bin' >> /etc/profile.d/myEnv.shecho 'export PATH=$PATH:$HADOOP_HOME/sbin' >> /etc/profile.d/m ...</div></div></div><div class="recent-post-item"><div class="recent-post-info no-cover"><a class="article-title" href="/posts/61251.html" title="Hadoop集群Zookeeper配置">Hadoop集群Zookeeper配置</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2024-09-11T14:45:40.000Z" title="发表于 2024-09-11 22:45:40">2024-09-11</time></span></div><div class="content">Zookeeper脚本配置
|
||||||
拷贝ips1cp ips ips_zookeeper
|
拷贝ips1cp ips ips_zookeeper
|
||||||
修改为123nn1nn2nn3
|
修改为123nn1nn2nn3
|
||||||
拷贝三个脚本123cp scp_all.sh scp_all_zookeeper.sh cp ssh_all.sh ssh_all_zookeeper.sh cp ssh_root.sh ssh_root_zookeeper.sh
|
拷贝三个脚本123cp scp_all.sh scp_all_zookeeper.sh cp ssh_all.sh ssh_all_zookeeper.sh cp ssh_root.sh ssh_root_zookeeper.sh
|
||||||
|
|
@ -160,15 +194,7 @@
|
||||||
将三个脚本中的ips改为ips_zookeeper
|
将三个脚本中的ips改为ips_zookeeper
|
||||||
|
|
||||||
Zookeeper安装
|
Zookeeper安装
|
||||||
上传到/tmp目录下，解压 12345sudo tar -zxvf /tmp/zookeeper-3.4.8.tar.gz -C /usr/local/scp -r /usr/local/zookeeper-3.4.8/ root@nn2:/usr/local/scp -r /usr/local/zookeeper-3.4.8/ root@nn3:/usr/local/ssh_root_zookeepe ...</div></div></div><div class="recent-post-item"><div class="recent-post-info no-cover"><a class="article-title" href="/posts/61253.html" title="Hadoop集群搭建基础环境">Hadoop集群搭建基础环境</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2024-09-11T14:45:40.000Z" title="发表于 2024-09-11 22:45:40">2024-09-11</time></span></div><div class="content">防火墙关闭123# 在 6 台主机执行systemctl stop firewalldsystemctl disable firewalld
|
上传到/tmp目录下，解压 12345sudo tar -zxvf /tmp/zookeeper-3.4.8.tar.gz -C /usr/local/scp -r /usr/local/zookeeper-3.4.8/ root@nn2:/usr/local/scp -r /usr/local/zookeeper-3.4.8/ root@nn3:/usr/local/ssh_root_zookeepe ...</div></div></div><div class="recent-post-item"><div class="recent-post-info no-cover"><a class="article-title" href="/posts/16107.html" title="Hello World">Hello World</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2024-09-11T00:01:10.419Z" title="发表于 2024-09-11 08:01:10">2024-09-11</time></span></div><div class="content">Welcome to Hexo! This is your very first post. Check documentation for more info. If you get any problems when using Hexo, you can find the answer in troubleshooting or you can ask me on GitHub.
|
||||||
配置yum源
|
|
||||||
下载 repo 文件：Centos-7.repo并上传到/tmp，进入到/tmp
|
|
||||||
备份并且替换系统的repo文件1234 cp Centos-7.repo /etc/yum.repos.d/ cd /etc/yum.repos.d/ mv CentOS-Base.repo CentOS-Base.repo.bak mv Centos-7.repo CentOS-Base.repo
|
|
||||||
将nn1上的CentOS-Base.repo拷贝到其他主机12345scp /etc/yum.repos.d/CentOS-Base.repo root@nn2:/etc/yum.repos.dscp /etc/yum.repos.d/CentOS-Base.repo root@nn3:/etc/yum.repos.dscp /etc/yum.repos.d/CentOS-Base.repo root@s1:/etc/yum.repos.dscp /et ...</div></div></div><div class="recent-post-item"><div class="recent-post-info no-cover"><a class="article-title" href="/posts/61252.html" title="Hadoop集群HDFS配置">Hadoop集群HDFS配置</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2024-09-11T14:45:40.000Z" title="发表于 2024-09-11 22:45:40">2024-09-11</time></span></div><div class="content">上传hadoop-3.1.4.tar.gz到/tmp，解压
|
|
||||||
注意在六台机器均上传到/tmp
|
|
||||||
|
|
||||||
12345# 在6台机器执行sudo tar -zxvf /tmp/hadoop-3.1.4.tar.gz -C /usr/local/# 分发到其他主机ssh_root.sh chown -R hadoop:hadoop /usr/local/hadoop-3.1.4ssh_root.sh ln -s /usr/local/hadoop-3.1.4/ /usr/local/hadoop
|
|
||||||
配置环境变量123echo 'export HADOOP_HOME=/usr/local/hadoop' >> /etc/profile.d/myEnv.shecho 'export PATH=$PATH:$HADOOP_HOME/bin' >> /etc/profile.d/myEnv.shecho 'export PATH=$PATH:$HADOOP_HOME/sbin' >> /etc/profile.d/m ...</div></div></div><div class="recent-post-item"><div class="recent-post-info no-cover"><a class="article-title" href="/posts/16107.html" title="Hello World">Hello World</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2024-09-11T00:01:10.419Z" title="发表于 2024-09-11 08:01:10">2024-09-11</time></span></div><div class="content">Welcome to Hexo! This is your very first post. Check documentation for more info. If you get any problems when using Hexo, you can find the answer in troubleshooting or you can ask me on GitHub.
|
|
||||||
Quick StartCreate a new post1$ hexo new "My New Post"
|
Quick StartCreate a new post1$ hexo new "My New Post"
|
||||||
|
|
||||||
More info: Writing
|
More info: Writing
|
||||||
|
|
@ -206,27 +232,17 @@ More info: Deployment
|
||||||
机场选择的建议：
|
机场选择的建议：
|
||||||
一元机场可以看到
|
一元机场可以看到
|
||||||
|
|
||||||
12元/年,每月50GB的可用额 ...</div></div></div><div class="recent-post-item"><div class="recent-post-info no-cover"><a class="article-title" href="/posts/33957.html" title="组件使用">组件使用</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2024-08-05T06:07:01.000Z" title="发表于 2024-08-05 14:07:01">2024-08-05</time></span></div><div class="content">组件自动导入123456"easycom":{ "autoscan": true, "custom": { "^tui-(.*)": "@/components/thorui/tui-$1/tui-$1.vue" // 匹配components目录内的vue文件 }}
|
12元/年,每月50GB的可用额 ...</div></div></div><div class="recent-post-item"><div class="recent-post-info no-cover"><a class="article-title" href="/posts/58817.html" title="uniapp 开发">uniapp 开发</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2024-08-05T06:07:01.000Z" title="发表于 2024-08-05 14:07:01">2024-08-05</time></span></div><div class="content">
|
||||||
|
|
||||||
tui-sticky 吸顶容器
|
|
||||||
包含 以下 tui 组件 :
|
|
||||||
|
|
||||||
tui-sticky
|
|
||||||
tui-list-view
|
|
||||||
tui-list-cell
|
|
||||||
|
|
||||||
|
|
||||||
123456789101112131415161718192021222324252627282930<tui-sticky :scrollTop="scrollTop" stickyHeight="104rpx" container> <!-- header start --> <template v-slot:header> ...</div></div></div><div class="recent-post-item"><div class="recent-post-info no-cover"><a class="article-title" href="/posts/58817.html" title="uniapp 开发">uniapp 开发</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2024-08-05T06:07:01.000Z" title="发表于 2024-08-05 14:07:01">2024-08-05</time></span></div><div class="content">
|
|
||||||
uniapp component
|
uniapp component
|
||||||
|
|
||||||
</div></div></div><nav id="pagination"><div class="pagination"><span class="page-number current">1</span><a class="page-number" href="/page/2/#content-inner">2</a><a class="extend next" rel="next" href="/page/2/#content-inner"><i class="fas fa-chevron-right fa-fw"></i></a></div></nav></div><div class="aside-content" id="aside-content"><div class="card-widget card-info"><div class="is-center"><div class="avatar-img"><img src="/img/avatar.jpg" onerror="this.onerror=null;this.src='/img/friend_404.gif'" alt="avatar"/></div><div class="author-info__name">shenjianZ</div><div class="author-info__description">一份快捷简便的文档，便于查阅编程的细节</div></div><div class="card-info-data site-data is-center"><a href="/archives/"><div class="headline">文章</div><div class="length-num">12</div></a><a href="/tags/"><div class="headline">标签</div><div class="length-num">3</div></a><a href="/categories/"><div class="headline">分类</div><div class="length-num">1</div></a></div><a id="card-info-btn" target="_blank" rel="noopener" href="https://github.com/shenjianz"><i class="fab fa-github"></i><span>Follow Me</span></a><div class="card-info-social-icons is-center"><a class="social-icon" href="https://github.com/shenjianZ" target="_blank" title="Github"><i class="fab fa-github" style="color: #24292e;"></i></a><a class="social-icon" href="mailto:15202078626@163.com" target="_blank" title="Email"><i class="fas fa-envelope" style="color: #4a7dbe;"></i></a></div></div><div class="card-widget card-announcement"><div class="item-headline"><i class="fas fa-bullhorn fa-shake"></i><span>公告</span></div><div class="announcement_content">一个简单快捷的文档知识点查阅网站</div></div><div class="sticky_layout"><div class="card-widget card-recent-post"><div class="item-headline"><i class="fas fa-history"></i><span>最新文章</span></div><div class="aside-list"><div class="aside-list-item no-cover"><div class="content"><a class="title" href="/posts/61251.html" title="Hadoop集群Zookeeper配置">Hadoop集群Zookeeper配置</a><time datetime="2024-09-11T14:45:40.000Z" title="发表于 2024-09-11 22:45:40">2024-09-11</time></div></div><div class="aside-list-item no-cover"><div class="content"><a class="title" href="/posts/61253.html" title="Hadoop集群搭建基础环境">Hadoop集群搭建基础环境</a><time datetime="2024-09-11T14:45:40.000Z" title="发表于 2024-09-11 22:45:40">2024-09-11</time></div></div><div class="aside-list-item no-cover"><div class="content"><a class="title" href="/posts/61252.html" title="Hadoop集群HDFS配置">Hadoop集群HDFS配置</a><time datetime="2024-09-11T14:45:40.000Z" title="发表于 2024-09-11 22:45:40">2024-09-11</time></div></div><div class="aside-list-item no-cover"><div class="content"><a class="title" href="/posts/16107.html" title="Hello World">Hello World</a><time datetime="2024-09-11T00:01:10.419Z" title="发表于 2024-09-11 08:01:10">2024-09-11</time></div></div><div class="aside-list-item no-cover"><div class="content"><a class="title" href="/posts/34849.html" title="script">script</a><time datetime="2024-08-17T03:09:24.000Z" title="发表于 2024-08-17 11:09:24">2024-08-17</time></div></div></div></div><div class="card-widget card-categories"><div class="item-headline">
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||||||
<i class="fas fa-folder-open"></i>
|
<i class="fas fa-folder-open"></i>
|
||||||
<span>分类</span>
|
<span>分类</span>
|
||||||
|
|
||||||
</div>
|
</div>
|
||||||
<ul class="card-category-list" id="aside-cat-list">
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<ul class="card-category-list" id="aside-cat-list">
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||||||
<li class="card-category-list-item "><a class="card-category-list-link" href="/categories/%E5%8F%A4%E6%96%87%E8%A7%82%E6%AD%A2/"><span class="card-category-list-name">古文观止</span><span class="card-category-list-count">1</span></a></li>
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<li class="card-category-list-item "><a class="card-category-list-link" href="/categories/%E5%8F%A4%E6%96%87%E8%A7%82%E6%AD%A2/"><span class="card-category-list-name">古文观止</span><span class="card-category-list-count">1</span></a></li>
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||||||
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tui-sticky 吸顶容器
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包含 以下 tui 组件 :
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tui-sticky
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tui-list-view
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tui-list-cell
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123456789101112131415161718192021222324252627282930<tui-sticky :scrollTop="scrollTop" stickyHeight="104rpx" container> <!-- header start --> <template v-slot:header> ...</div></div></div><div class="recent-post-item"><div class="recent-post-info no-cover"><a class="article-title" href="/posts/47807.html" title="Docker被墙，如何继续使用？">Docker被墙，如何继续使用？</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2024-08-01T01:10:40.000Z" title="发表于 2024-08-01 09:10:40">2024-08-01</time></span></div><div class="content">Docker Download
|
||||||
自从docker官方仓库在中国大陆被墙后，docker的部署方式也发生了改变。解决docker安装问题：https://github.com/shenjianZ/docker_installer
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自从docker官方仓库在中国大陆被墙后，docker的部署方式也发生了改变。解决docker安装问题：https://github.com/shenjianZ/docker_installer
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@ -174,14 +184,14 @@ Docker pull images
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deploy
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deploy
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init: (str) => {
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init: (str) => {
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strings: str,
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strings: str,
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@ -0,0 +1,51 @@
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---
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title: 机器学习
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tags: machinelearning
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abbrlink: 29139
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mathjax: true
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date: 2025-01-13 17:20:59
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---
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## **k近邻算法（K-Nearest Neighbors）KNN**
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将当前样本的类别归类于距离最近的**k**个样本的类别
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#### **距离公式(2维)**
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- 欧式距离
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$$
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d = \sqrt{(x_1-y_1)^2 + (x_2 - y_2)^2}
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|
$$
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|
- 曼哈顿距离
|
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|
$$
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|
d = |x_1 - x_2| + |y_1 - y_2|
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|
$$
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- 切比雪夫距离
|
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|
$$
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|
d = \max\left(|x_1 - x_2|, |y_1 - y_2|\right)
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|
$$
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#### k值选择问题
|
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|
| k值 | 影响 |
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|
| --- | ------------------ |
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|
| 越大 | 模型过拟合，准确率波动较大 |
|
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|
| 越小 | 模型欠拟合，准确率趋于稳定但可能较低 |
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|
### 特征预处理
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|
> 通过一些转换函数将特征数据转换成更加适合算法模型的特征数据过程
|
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|
- 归一化
|
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|
将数据变换到指定区间（默认是\[0,1\]）
|
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|
$$ x' = \frac{x- x_{\text {min}}}{x_{\text{max}} - x_{\text{min}}} $$
|
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|
若需要缩放到任意区间 \(\[a, b\]\)，公式为： $$ x' = a + \frac{(x - x_{\text{min}}) \cdot (b - a)}{x_{\text{max}} - x_{\text{min}}} $$
|
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|
其中：\( \[a, b\] \)：目标区间的范围
|
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|
归一化受到数据集的异常值的影响，需要进行标准化处理（更加合理）
|
||||||
|
``` python
|
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|
from sklearn.preprocessing import MinMaxScaler # 归一化
|
||||||
|
```
|
||||||
|
- 标准化
|
||||||
|
将数据调整为均值为 0，标准差为 1 的标准正态分布
|
||||||
|
$$ z = \frac{x - \mu}{\sigma} $$
|
||||||
|
\( z \)：标准化后的值 \( x \)：原始数据值 \( $\mu$ \)：数据的均值 \( $\sigma$\)：数据的标准差
|
||||||
|
|
||||||
|
``` python
|
||||||
|
from sklearn.preprocessing import StandardScaler # 标准化
|
||||||
|
```
|
||||||
|
|
||||||
Loading…
Reference in New Issue