add ensemble learning details

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shenjianZ committed 2025-01-25 15:15:59 +08:00
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@@ -151,7 +151,10 @@
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Random-Forest 就是Bagging + Decisiontree
1234567891011121314151617181920212223242526272829303132333435import seaborn as snsimport pandas as pdimport numpy as npfrom sklearn.model_selection import train_test_split,GridSearchCVfrom sklearn.feature_extraction import DictVectorizerfrom sklearn.ensemble import RandomForestClassifier# 1.获取数据集 - 加载 Titanic 数据集titanic = sns.load_dataset(&#x27;titanic&#x27;)missing_age_count = titanic[&#x27;age&#x27;].isna().sum()# print(f&quot;缺失的 age 数量: &#1 ...</div></div></div><div class="recent-post-item"><div class="recent-post-info no-cover"><a class="article-title" href="/posts/95.html" title="决策树算法">决策树算法</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="2025-01-24T04:39:59.000Z" title="发表于 2025-01-24 12:39:59">2025-01-24</time></span><span class="article-meta"><span class="article-meta-separator">|</span><i class="fas fa-inbox"></i><a class="article-meta__categories" href="/categories/machinelearning/">machinelearning</a></span></div><div class="content">C4.5C4.5 是一种用于生成决策树的算法,不再使用信息增益,而是使用信息增益比,来避免偏向于选择取值较多的特征。信息增益比是信息增益与特征的熵的比值。
ID3D3 是一种基于信息增益(Information Gain)的决策树算法
CartCART(分类与回归树)一种决策树算法,,CART 使用 二叉树结构,即每个节点只能有两个子节点。
cart剪枝CART 决策树的剪枝方法分为 预剪枝(Pre-pruning)和 后剪枝(Post-pruning)两种:
@@ -212,7 +215,11 @@ k值
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/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
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 &#x27;export HADOOP_HOME=/usr/local/hadoop&#x27; &gt;&gt; /etc/profile.d/myEnv.shecho &#x27;export PATH=$PATH:$HADOOP_HOME/bin&#x27; &gt;&gt; /etc/profile.d/myEnv.shecho &#x27;export PATH=$PATH:$HADOOP_HOME/sbin&#x27; &gt;&gt; /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
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
@@ -221,11 +228,7 @@ k值
将三个脚本中的ips改为ips_zookeeper
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/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 &#x27;export HADOOP_HOME=/usr/local/hadoop&#x27; &gt;&gt; /etc/profile.d/myEnv.shecho &#x27;export PATH=$PATH:$HADOOP_HOME/bin&#x27; &gt;&gt; /etc/profile.d/myEnv.shecho &#x27;export PATH=$PATH:$HADOOP_HOME/sbin&#x27; &gt;&gt; /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.
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.
Quick StartCreate a new post1$ hexo new &quot;My New Post&quot;
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@@ -238,14 +241,14 @@ More info: Generating
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