mahout itemCF 简单使用

以你之姓@ 2022-08-18 00:47 135阅读 0赞

**一、itemCF 测试**

mahout版本 0.10.0

mahout 提供了很多的算法，其中比较常用的算是itemCF了这里记录一下itemcf的使用方法

1、数据准备，这里是使用自己采集的一些行为数据 ，数据不多，但是可以测试出结果：

下面三列分别是 user\_id , item\_id , perfence

把以下数据存放到hdfs上，我存放的路径是/mahout/itemcf/data1/itemdata.data

0162381440670851711,4,7.0
       0162381440670851711,11,4.0
       0162381440670851711,32,1.0
       0162381440670851711,176,27.0
       0162381440670851711,183,11.0
       0162381440670851711,184,5.0
       0162381440670851711,207,9.0
       0162381440670851711,256,3.0
       0162381440670851711,258,4.0
       0162381440670851711,259,16.0
       0162381440670851711,260,8.0
       0162381440670851711,261,18.0
       0162381440670851711,301,1.0
       0162381440670851711,307,1.0
       0162381440670851711,477,1.0
       0162381440670851711,518,1.0
       0162381440670851711,549,3.0
       0162381440670851711,570,1.0
       0162381440670851711,826,2.0
       0357211441096952115,207,1.0
       0617721441096186493,184,1.0
       0617721441096186493,207,1.0
       1205421441071459451,5,1.0
       1214361441096861254,207,1.0
       1401731441095483081,258,1.0
       1401731441095483081,814,4.0
       1401731441095483081,826,1.0
       1917281441163686119,259,10.0
       1917281441163686119,260,1.0
       1917281441163686119,261,3.0
       1966141441163860798,176,1.0
       2294491441095342047,176,1.0
       2441031440670827430,4,13.0
       2441031440670827430,259,29.0
       2441031440670827430,261,14.0
       2441031440670827430,460,2.0
       2441031440670827430,477,6.0
       2441031440670827430,570,1.0
       2441031440670827430,577,6.0
       2441031440670827430,702,1.0
       2441031440670827430,758,2.0
       2441031440670827430,809,1.0
       2475791441161318569,176,1.0
       2987091441068878630,261,1.0
       3114261440726814722,549,1.0
       3445831441096810087,207,1.0
       3846061441096937902,207,1.0
       4266911441160164599,176,1.0
       4698311441097046150,176,2.0
       4698311441097046150,183,2.0
       4698311441097046150,184,4.0
       4698311441097046150,207,6.0
       4946291441097563245,183,1.0
       4956331440750398178,159,1.0
       4956331440750398178,160,1.0
       5307571441160362208,4,1.0
       5307571441160362208,176,1.0
       5719691441098504387,176,5.0
       5719691441098504387,184,1.0
       5719691441098504387,207,1.0
       5813281441095425044,184,2.0
       5813281441095425044,258,1.0
       5894601441095265604,184,1.0
       5981521441096106535,207,1.0
       6292291441096870187,207,1.0
       6533651441161410910,176,1.0
       6810691441096902907,207,1.0
       6836071440729632252,4,3.0
       6836071440729632252,49,1.0
       6836071440729632252,259,2.0
       6836071440729632252,570,1.0
       6836071440729632252,577,2.0
       6964141441160527746,176,1.0
       7495291441096796843,207,1.0
       7616681441095305067,183,1.0
       7616681441095305067,184,2.0
       7616681441095305067,258,2.0
       7616681441095305067,261,1.0
       7732211441095211112,183,1.0
       7732211441095211112,259,2.0
       7732211441095211112,260,9.0
       7732211441095211112,261,1.0
       7732211441095211112,632,6.0
       8211761441096060717,176,1.0
       8211761441096060717,183,1.0
       8305691441168039389,259,3.0
       8305691441168039389,260,2.0
       8305691441168039389,261,1.0
       8375281440837772178,527,1.0
       8432311440724457499,290,1.0
       8641451441097297246,183,1.0
       8641451441097297246,184,1.0
       8641451441097297246,207,1.0
       8641451441097297246,259,1.0
       8641451441097297246,263,1.0
       8641451441097297246,838,1.0
       8641451441097297246,839,1.0
       8641451441097297246,840,1.0
       8651081441095283643,176,2.0
       8651081441095283643,183,7.0
       8753221441095342356,176,1.0

2、使用mahout自带的算法 实现协同过滤：

语句如下：

bin/hadoop jar /home/lin/hadoop/mahout-distribution-0.10.0/mahout-examples-0.10.0-job.jar  org.apache.mahout.cf.taste.hadoop.item.RecommenderJob  -i /mahout/itemcf/data1   -o  /mahout/itemcf/result1 -s SIMILARITY_LOGLIKELIHOOD --tempDir /mahout/itemcf/temp1

其中 -i 后面是输入数据存放地址，也就是上面给的测试数据；

-o 后面是结果输出地址，这个文件夹不用建立，mahout会自动建立，若是已经存在则会报错；

--tempDir 是指临时存放的一些输出数据，mahout自己的一些输出 ，这个路径mahout自动创建，若是存在会报错；

-s  是指定使用算法；可以根据自己的需要选择；

具体的help如下

Job-Specific Options: 
        --input (-i) input Path to job input 
        directory. 
        --output (-o) output The directory 
        pathname for output. 
        --similarityClassname (-s) similarityClassname Name of distributed 
        similarity measures 
        class to instantiate, 
        alternatively use one 
        of the predefined 
        similarities 
        ([SIMILARITY_COOCCURRE
        NCE, 
        SIMILARITY_LOGLIKELIHO
        OD, 
        SIMILARITY_TANIMOTO_CO
        EFFICIENT, 
        SIMILARITY_CITY_BLOCK,
        SIMILARITY_COSINE, 
        SIMILARITY_PEARSON_COR
        RELATION, 
        SIMILARITY_EUCLIDEAN_D
        ISTANCE]) 
        --maxSimilaritiesPerItem (-m) maxSimilaritiesPerItem try to cap the number 
        of similar items per 
        item to this number 
        (default: 100) 
        --maxPrefs (-mppu) maxPrefs max number of 
        preferences to 
        consider per user or 
        item, users or items 
        with more preferences 
        will be sampled down 
        (default: 500) 
        --minPrefsPerUser (-mp) minPrefsPerUser ignore users with 
        less preferences than 
        this (default: 1) 
        --booleanData (-b) booleanData Treat input as 
        without pref values 
        --threshold (-tr) threshold discard item pairs 
        with a similarity 
        value below this 
        --randomSeed randomSeed use this seed for 
        sampling 
        --help (-h) Print out help 
        --tempDir tempDir Intermediate output 
        directory 
        --startPhase startPhase First phase to run 
        --endPhase endPhase Last phase to run

3、执行上述命令后，等待执行完毕，在目录 /mahout/itemcf/result1 可以看到如下数据：

162381440670851711 [809:13.535571,702:13.535571,460:13.535571,758:13.535571,632:13.182321,577:12.929438,49:11.368558,307:10.562227,32:10.562227,518:10.562227]
        617721441096186493 [839:1.0,259:1.0,518:1.0,826:1.0,11:1.0,260:1.0,4:1.0,32:1.0,176:1.0,840:1.0]
        1401731441095483081 [11:1.0,570:1.0,518:1.0,307:1.0,260:1.0,259:1.0,549:1.0,32:1.0,207:1.0,184:1.0]
        1917281441163686119 [577:7.365086,702:6.5,809:6.5,758:6.5,460:6.5,184:5.9840446,176:5.981493,4:5.577299,570:5.3220325,477:4.9567957]
        2441031440670827430 [632:21.5,176:18.084661,183:15.684914,260:14.2175,207:13.510652,11:12.28147,307:12.28147,32:12.28147,518:12.28147,256:12.28147]
        4698311441097046150 [263:3.9337947,839:3.9337947,840:3.9337947,838:3.9337947,11:3.4747553,307:3.4747553,32:3.4747553,518:3.4747553,256:3.4747553,301:3.4747553]
        5307571441160362208 [826:1.0,259:1.0,518:1.0,307:1.0,11:1.0,260:1.0,549:1.0,32:1.0,207:1.0,184:1.0]
        5719691441098504387 [4:3.6454906,259:3.6147578,260:2.67091,261:2.6694102,183:2.517088,307:2.2876854,11:2.2876854,32:2.2876854,518:2.2876854,256:2.2876854]
        5813281441095425044 [207:1.8607497,259:1.6642486,183:1.5539461,301:1.4806436,11:1.4806436,307:1.4806436,32:1.4806436,518:1.4806436,256:1.4806436,549:1.4099455]
        6836071440729632252 [207:2.6088793,176:2.3617313,477:1.9966183,460:1.9945599,758:1.9945599,809:1.9945599,702:1.9945599,11:1.9926376,307:1.9926376,32:1.9926376]
        7616681441095305067 [826:1.5790755,207:1.5721571,549:1.535743,301:1.50748,307:1.50748,11:1.50748,32:1.50748,518:1.50748,256:1.50748,839:1.5]
        7732211441095211112 [826:3.7059078,549:3.7059078,307:3.3461132,256:3.3461132,518:3.3461132,11:3.3461132,301:3.3461132,32:3.3461132,570:3.1800203,477:3.1795032]
        8211761441096060717 [826:1.0,259:1.0,518:1.0,307:1.0,11:1.0,260:1.0,549:1.0,32:1.0,207:1.0,184:1.0]
        8305691441168039389 [577:2.2471673,4:2.083036,570:2.0549815,809:2.0,460:2.0,11:2.0,826:2.0,32:2.0,307:2.0,549:2.0]
        8641451441097297246 [11:1.0,632:1.0,518:1.0,826:1.0,260:1.0,570:1.0,549:1.0,32:1.0,307:1.0,477:1.0]
        8651081441095283643 [184:6.597979,258:6.1955295,260:6.1955295,826:5.5266876,549:5.5266876,477:5.5266876,259:4.662548,261:4.662548,11:4.626224,307:4.626224]

这样就得出了每个用户的推荐物品；

--------------------

mahout 还有一个经常用到的算法 物品相似度 ，这样得到的结果是物品间的相度：

mahout itemsimilarity  -i /mahout/itemcf/data1   -o  /mahout/itemcf/result1 -s SIMILARITY_LOGLIKELIHOOD --tempDir /mahout/itemcf/temp1