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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>97.3. Mahout</title><link rel="stylesheet" type="text/css" href="docbook.css" /><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><link rel="home" href="index.html" title="Netkiller Java 手札（版）" /><link rel="up" href="sdk.html" title="第 97 章 Software Development Kit" /><link rel="prev" href="google.html" title="97.2. Google" /><link rel="next" href="hessian.html" title="97.4. Hessian" /></head><body><a xmlns="" href="//www.netkiller.cn/">Home</a> | <a xmlns="" href="//netkiller.github.io/">简体中文</a> | <a xmlns="" href="http://netkiller.sourceforge.net/">繁体中文</a> | <a xmlns="" href="/journal/index.html">杂文</a>
| <a xmlns="" href="https://github.com/netkiller">Github</a> | <a xmlns="" href="https://zhuanlan.zhihu.com/netkiller">知乎专栏</a> | <a xmlns="" href="https://www.facebook.com/bg7nyt">Facebook</a> | <a xmlns="" href="http://cn.linkedin.com/in/netkiller/">Linkedin</a> | <a xmlns="" href="https://www.youtube.com/user/bg7nyt/videos">Youtube</a> | <a xmlns="" href="//www.netkiller.cn/home/donations.html">打赏(Donations)</a> | <a xmlns="" href="//www.netkiller.cn/home/about.html">About</a><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">97.3. Mahout</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="google.html">上一页</a> </td><th width="60%" align="center">第 97 章 Software Development Kit</th><td width="20%" align="right"> <a accesskey="n" href="hessian.html">下一页</a></td></tr></table><hr /></div><table xmlns=""><tr><td><iframe src="//ghbtns.com/github-btn.html?user=netkiller&repo=netkiller.github.io&type=watch&count=true&size=large" height="30" width="170" frameborder="0" scrolling="0" style="width:170px; height: 30px;" allowTransparency="true"></iframe></td><td><iframe src="//ghbtns.com/github-btn.html?user=netkiller&repo=netkiller.github.io&type=fork&count=true&size=large" height="30" width="170" frameborder="0" scrolling="0" style="width:170px; height: 30px;" allowTransparency="true"></iframe></td><td><iframe src="//ghbtns.com/github-btn.html?user=netkiller&type=follow&count=true&size=large" height="30" width="240" frameborder="0" scrolling="0" style="width:240px; height: 30px;" allowTransparency="true"></iframe></td><td></td><td><a href="https://zhuanlan.zhihu.com/netkiller"><img src="/images/logo/zhihu-card-default.svg" height="25" /></a></td><td valign="middle"><a href="https://zhuanlan.zhihu.com/netkiller">知乎专栏</a></td><td></td><td></td><td></td><td></td></tr></table><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="mahout"></a>97.3. Mahout</h2></div></div></div>
<div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="id1750"></a>97.3.1. 推荐系统</h3></div></div></div>
<div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="id1747"></a>97.3.1.1. Maven pom.xml</h4></div></div></div>
<pre class="screen">
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>cn.netkiller</groupId>
<artifactId>mahout</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>mahout</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>org.apache.mahout</groupId>
<artifactId>mahout-core</artifactId>
<version>0.9</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-nop</artifactId>
<version>1.7.30</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>
</pre>
</div>
<div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="id1748"></a>97.3.1.2. 推荐程序</h4></div></div></div>
<pre class="programlisting">
package cn.netkiller.mahout;
import java.io.File;
import java.util.List;
import org.apache.mahout.cf.taste.impl.model.file.FileDataModel;
import org.apache.mahout.cf.taste.impl.neighborhood.NearestNUserNeighborhood;
import org.apache.mahout.cf.taste.impl.recommender.GenericUserBasedRecommender;
import org.apache.mahout.cf.taste.impl.similarity.PearsonCorrelationSimilarity;
import org.apache.mahout.cf.taste.model.DataModel;
import org.apache.mahout.cf.taste.neighborhood.UserNeighborhood;
import org.apache.mahout.cf.taste.recommender.RecommendedItem;
import org.apache.mahout.cf.taste.recommender.Recommender;
import org.apache.mahout.cf.taste.similarity.UserSimilarity;
public class App {
public App() {
// TODO Auto-generated constructor stub
}
public static void main(String[] args) {
// TODO Auto-generated method stub
try {
// 从文件加载数据
DataModel model = new FileDataModel(new File("target/classes/test.csv"));
// 指定用户相似度计算方法，这里采用皮尔森相关度
UserSimilarity similarity = new PearsonCorrelationSimilarity(model);
// 指定用户邻居数量，这里为2
UserNeighborhood neighborhood = new NearestNUserNeighborhood(2, similarity, model);
// 构建基于用户的推荐系统
Recommender recommender = new GenericUserBasedRecommender(model, neighborhood, similarity);
// 得到指定用户的推荐结果，这里是得到用户1的两个推荐
List<RecommendedItem> recommendations = recommender.recommend(1, 2);
// 打印推荐结果
for (RecommendedItem recommendation : recommendations) {
System.out.println(recommendation);
}
} catch (Exception e) {
System.out.println(e);
}
}
}
</pre>
</div>
<div class="section"><div class="titlepage"><div><div><h4 class="title"><a id="id1749"></a>97.3.1.3. 数据文件</h4></div></div></div>
<pre class="screen">
1,101,5.0
1,102,3.0
1,103,2.5
2,101,2.0
2,102,2.5
2,103,5.0
2,104,2.0
3,101,2.5
3,104,4.0
3,105,4.5
3,107,5.0
4,101,5.0
4,103,3.0
4,104,4.5
4,106,4.0
5,101,4.0
5,102,3.0
5,103,2.0
5,104,4.0
5,105,3.5
5,106,4.0
</pre>
</div>
</div>
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