R语言实现MapReduce的协同过滤算法

原文地址：http://www.tuicool.com/articles/63Ejqi

Author：张丹(Conan) 
Date: 2013-04-07

Weibo: @Conan_Z 
Email: [email protected] 
Blog: http://www.fens.me/blog

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@晒粉丝 http://www.fens.me 
@每日中国天气 http://apps.weibo.com/chinaweatherapp

RHadoop实践系列文章

RHadoop实践系列文章，包含了R语言与Hadoop结合进行海量数据分析。Hadoop主要用来存储海量数据，R语言完成MapReduce 算法，用来替代Java的MapReduce实现。有了RHadoop可以让广大的R语言爱好者，有更强大的工具处理大数据。1G, 10G, 100G, TB,PB 由于大数据所带来的单机性能问题，可能会一去联复返了。

RHadoop实践是一套系列文章，主要包括”Hadoop环境搭建”，”RHadoop安装与使用”，”R实现MapReduce的算法案 例”，”HBase和rhbase的安装与使用”。对于单独的R语言爱好者，Java爱好者，或者Hadoop爱好者来说，同时具备三种语言知识并不容 易。此文虽为入门文章，但R,Java,Hadoop基础知识还是需要大家提前掌握。 

第三篇 R实现MapReduce的协同过滤算法，分为3个章节。

1.基于物品推荐的协同过滤算法介绍
2.R本地程序实现
3.R基于Hadoop分步式程序实现

每一章节，都会分为”文字说明部分”和”代码部分”，保持文字说明与代码的连贯性。

注：Hadoop环境及RHadoop的环境，请查看同系列前二篇文章，此文将不再介绍。

基于物品推荐的协同过滤算法介绍

文字说明部分：

越来越多的互联网应用，都开始使用推荐算法(协同过滤算法)。根据用户活跃度和物品流行度，可以分为”基于用户的协同过滤算法”和”基于物品的协同过滤算法”。

基于用户的协同过滤算法，是给用户推荐和他兴趣相似的其他用户喜欢的物品。 
基于物品的协同过滤算法，是给用户推荐和他之前喜欢的物品相似的物品。 
基于物品的协同过滤算法，是目前广泛使用的一种推荐算法，像Netflix, YouTube, Amazon等。

算法主要分为两步： 
1. 计算物品之间的相似度 
2. 根据物品的相似度和用户的历史行为给用户生成推荐列表

有关算法的细节请参考：”Mahout In Action”和”推荐系统实践”两本书。

为开发方便，我们选择一组很小的测试数据集。

测试数据，来自于”Mahout In Action” P49 
原第8行，3,101,2.5 改为 3,101,2.0 
每行3个字段，依次是用户ID,物品ID,对物品的评分

代码部分：

在服务上创建测试数据文件small.csv

~ pwd

/root/R

~ vi small.csv

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
3,101,2.0
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

~ ls

small.csv

R本地程序实现

首先，通过R语言实现基于物品的协同过滤算法，为和RHadoop实现进行对比。这里我使用”Mahout In Action”书里，第一章第六节介绍的分步式基于物品的协同过滤算法进行实现。 
“Chapter 6: Distributing recommendation computations”

算法的思想： 
1. 建立物品的同现矩阵 
2. 建立用户对物品的评分矩阵 
3. 矩阵计算推荐结果

文字说明部分：

1. 建立物品的同现矩阵

按用户分组，找到每个用户所选的物品，单独出现计数，及两两一组计数。

例如：用户ID为3的用户，分别给101,104,105,107，这4个物品打分。 
1) (101,101),(104,104),(105,105),(107,107)，单独出现计算各加1。 
2) (101,104),(101,105),(101,107),(104,105),(104,107),(105,107)，两个一组计数各加1。 
3) 把所有用户的计算结果求和，生成一个三角矩阵，再补全三角矩阵，就建立了物品的同现矩阵。

如下面矩阵所示：

[101] [102] [103] [104] [105] [106] [107]
[101] 5 3 4 4 2 2 1
[102] 3 3 3 2 1 1 0
[103] 4 3 4 3 1 2 0
[104] 4 2 3 4 2 2 1
[105] 2 1 1 2 2 1 1
[106] 2 1 2 2 1 2 0
[107] 1 0 0 1 1 0 1

2. 建立用户对物品的评分矩阵

按用户分组，找到每个用户所选的物品及评分

例如：用户ID为3的用户，分别给(3,101,2.0),(3,104,4.0),(3,105,4.5),(3,107,5.0)，这4个物品打分。 
1) 找到物品评分(3,101,2.0),(3,104,4.0),(3,105,4.5),(3,107,5.0) 
2) 建立用户对物品的评分矩阵

U3
[101] 2.0
[102] 0.0
[103] 0.0
[104] 4.0
[105] 4.5
[106] 0.0
[107] 5.0

3. 矩阵计算推荐结果

同现矩阵*评分矩阵=推荐结果

图片摘自”Mahout In Action”

推荐给用户ID为3的用户的结果是(103,24.5),(102,18.5),(106,16.5)

代码部分：

#引用plyr包
library(plyr)

#读取数据集
train<-read.csv(file="small.csv",header=FALSE)
names(train)<-c("user","item","pref") > train
user item pref
1 1 101 5.0
2 1 102 3.0
3 1 103 2.5
4 2 101 2.0
5 2 102 2.5
6 2 103 5.0
7 2 104 2.0
8 3 101 2.0
9 3 104 4.0
10 3 105 4.5
11 3 107 5.0
12 4 101 5.0
13 4 103 3.0
14 4 104 4.5
15 4 106 4.0
16 5 101 4.0
17 5 102 3.0
18 5 103 2.0
19 5 104 4.0
20 5 105 3.5
21 5 106 4.0
#计算用户列表
usersUnique<-function(){
users<-unique(train$user)
users[order(users)]
}

#计算商品列表方法
itemsUnique<-function(){
items<-unique(train$item)
items[order(items)]
}

# 用户列表
users<-usersUnique() > users
[1] 1 2 3 4 5
# 商品列表
items<-itemsUnique() > items
[1] 101 102 103 104 105 106 107
#建立商品列表索引
index<-function(x) which(items %in% x)
data<-ddply(train,.(user,item,pref),summarize,idx=index(item)) > data
user item pref idx
1 1 101 5.0 1
2 1 102 3.0 2
3 1 103 2.5 3
4 2 101 2.0 1
5 2 102 2.5 2
6 2 103 5.0 3
7 2 104 2.0 4
8 3 101 2.0 1
9 3 104 4.0 4
10 3 105 4.5 5
11 3 107 5.0 7
12 4 101 5.0 1
13 4 103 3.0 3
14 4 104 4.5 4
15 4 106 4.0 6
16 5 101 4.0 1
17 5 102 3.0 2
18 5 103 2.0 3
19 5 104 4.0 4
20 5 105 3.5 5
21 5 106 4.0 6
#同现矩阵
cooccurrence<-function(data){
n<-length(items)
co<-matrix(rep(0,n*n),nrow=n)
for(u in users){
idx<-index(data$item[which(data$user==u)])
m<-merge(idx,idx)
for(i in 1:nrow(m)){
co[m$x[i],m$y[i]]=co[m$x[i],m$y[i]]+1
}
}
return(co)
}

#推荐算法
recommend<-function(udata=udata,co=coMatrix,num=0){
n<-length(items)

# all of pref
pref<-rep(0,n)
pref[udata$idx]<-udata$pref

# 用户评分矩阵
userx<-matrix(pref,nrow=n)

# 同现矩阵*评分矩阵
r0),]

# 推荐结果取前num个
if(num>0){
topn<-head(topn,num)
}

#返回结果
return(topn)
}

#生成同现矩阵
co<-cooccurrence(data) > co
[,1] [,2] [,3] [,4] [,5] [,6] [,7]
[1,] 5 3 4 4 2 2 1
[2,] 3 3 3 2 1 1 0
[3,] 4 3 4 3 1 2 0
[4,] 4 2 3 4 2 2 1
[5,] 2 1 1 2 2 1 1
[6,] 2 1 2 2 1 2 0
[7,] 1 0 0 1 1 0 1
#计算推荐结果
recommendation<-data.frame()
for(i in 1:length(users)){
udata<-data[which(data$user==users[i]),]
recommendation<-rbind(recommendation,recommend(udata,co,0)) } > recommendation
user item val
1 1 104 33.5
2 1 106 18.0
3 1 105 15.5
4 1 107 5.0
5 2 106 20.5
6 2 105 15.5
7 2 107 4.0
8 3 103 24.5
9 3 102 18.5
10 3 106 16.5
11 4 102 37.0
12 4 105 26.0
13 4 107 9.5
14 5 107 11.5

R基于Hadoop分步式程序实现

R语言实现的MapReduce算法，可以基于R的数据对象实现，不必如JAVA一样使用文本存储。

算法思想同上面R语言实现思想，略有复杂。

算法的思想： 
1. 建立物品的同现矩阵 
1) 按用户分组，得到所有物品出现的组合列表。 
2) 对物品组合列表进行计数，建立物品的同现矩阵 
2. 建立用户对物品的评分矩阵 
3. 合并同现矩阵和评分矩阵 
4. 计算推荐结果列表 
5. 按输入格式得到推荐评分列表

通过MapReduce实现时，所有操作都要使用Map和Reduce的任务完成，程序实现过程略有变化。

图片摘自”Mahout In Action”

文字说明部分：

1. 建立物品的同现矩阵

1) 按用户分组，得到所有物品出现的组合列表。

key:物品列表向量 
val:物品组合向量

$key
[1] 101 101 101 101 101 101 101 101 101 101 101 101 101 101 101 102 102 102 102
[20] 102 102 102 103 103 103 103 103 103 103 103 103 103 103 104 104 104 104 104
[39] 104 104 104 104 104 104 104 105 105 105 105 106 106 106 106 107 107 107 107
[58] 101 101 101 101 101 101 102 102 102 102 102 102 103 103 103 103 103 103 104
[77] 104 104 104 104 104 105 105 105 105 105 105 106 106 106 106 106 106

$val
[1] 101 102 103 101 102 103 104 101 104 105 107 101 103 104 106 101 102 103 101
[20] 102 103 104 101 102 103 101 102 103 104 101 103 104 106 101 102 103 104 101
[39] 104 105 107 101 103 104 106 101 104 105 107 101 103 104 106 101 104 105 107
[58] 101 102 103 104 105 106 101 102 103 104 105 106 101 102 103 104 105 106 101
[77] 102 103 104 105 106 101 102 103 104 105 106 101 102 103 104 105 106

2) 对物品组合列表进行计数，建立物品的同现矩阵

key:物品列表向量 
val:同现矩阵的数据框值(item,item,Freq) 
矩阵格式，要与”2. 建立用户对物品的评分矩阵”的格式一致，把异构的两种数据源，合并为同一种数据格式，为”3. 合并 同现矩阵 和 评分矩阵”做数据基础。

$key
[1] 101 101 101 101 101 101 101 102 102 102 102 102 102 103 103 103 103 103 103
[20] 104 104 104 104 104 104 104 105 105 105 105 105 105 105 106 106 106 106 106
[39] 106 107 107 107 107

$val
k v freq
1 101 101 5
2 101 102 3
3 101 103 4
4 101 104 4
5 101 105 2
6 101 106 2
7 101 107 1
8 102 101 3
9 102 102 3
10 102 103 3
11 102 104 2
12 102 105 1
13 102 106 1
14 103 101 4
15 103 102 3
16 103 103 4
17 103 104 3
18 103 105 1
19 103 106 2
20 104 101 4
21 104 102 2
22 104 103 3
23 104 104 4
24 104 105 2
25 104 106 2
26 104 107 1
27 105 101 2
28 105 102 1
29 105 103 1
30 105 104 2
31 105 105 2
32 105 106 1
33 105 107 1
34 106 101 2
35 106 102 1
36 106 103 2
37 106 104 2
38 106 105 1
39 106 106 2
40 107 101 1
41 107 104 1
42 107 105 1
43 107 107 1

2. 建立用户对物品的评分矩阵

key:物品列表 
val:用户对物品打分矩阵 
矩阵格式，要与”2) 对物品组合列表进行计数，建立物品的同现矩阵”的格式一致，把异构的两种数据源，合并为同一种数据格式，为”3. 合并 同现矩阵 和 评分矩阵”做数据基础

$key
[1] 101 101 101 101 101 102 102 102 103 103 103 103 104 104 104 104 105 105 106
[20] 106 107

$val
item user pref
1 101 1 5.0
2 101 2 2.0
3 101 3 2.0
4 101 4 5.0
5 101 5 4.0
6 102 1 3.0
7 102 2 2.5
8 102 5 3.0
9 103 1 2.5
10 103 2 5.0
11 103 4 3.0
12 103 5 2.0
13 104 2 2.0
14 104 3 4.0
15 104 4 4.5
16 104 5 4.0
17 105 3 4.5
18 105 5 3.5
19 106 4 4.0
20 106 5 4.0
21 107 3 5.0

3. 合并 同现矩阵 和 评分矩阵

这一步操作是MapReduce比较特殊的，因为数据源是两个异构数据源，进行MapReduce的操作。 
在之前，我们已经把两种格式合并为一样的。使用equijoin这个rmr2包的函数，进行矩阵合并。 
key:NULL 
val:合并的数据框

$key
NULL

$val
k.l v.l freq.l item.r user.r pref.r
1 103 101 4 103 1 2.5
2 103 102 3 103 1 2.5
3 103 103 4 103 1 2.5
4 103 104 3 103 1 2.5
5 103 105 1 103 1 2.5
6 103 106 2 103 1 2.5
7 103 101 4 103 2 5.0
8 103 102 3 103 2 5.0
9 103 103 4 103 2 5.0
10 103 104 3 103 2 5.0
11 103 105 1 103 2 5.0
12 103 106 2 103 2 5.0
13 103 101 4 103 4 3.0
....

4. 计算推荐结果列表

把第三步中的矩阵，进行合并计算，得到推荐结果列表 
key:物品列表 
val:推荐结果数据框

$key
[1] 101 101 101 101 101 101 101 101 101 101 101 101 101 101 101 101 101 101
[19] 101 101 101 101 101 101 101 101 101 101 101 101 101 101 101 101 101 102
[37] 102 102 102 102 102 102 102 102 102 102 102 102 102 102 102 102 102 103
[55] 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103
[73] 103 103 103 103 103 104 104 104 104 104 104 104 104 104 104 104 104 104
[91] 104 104 104 104 104 104 104 104 104 104 104 104 104 104 104 105 105 105
[109] 105 105 105 105 105 105 105 105 105 105 105 106 106 106 106 106 106 106
[127] 106 106 106 106 106 107 107 107 107

$val
k.l v.l user.r v
1 101 101 1 25.0
2 101 101 2 10.0
3 101 101 3 10.0
4 101 101 4 25.0
5 101 101 5 20.0
6 101 102 1 15.0
7 101 102 2 6.0
8 101 102 3 6.0
9 101 102 4 15.0
10 101 102 5 12.0
11 101 103 1 20.0
12 101 103 2 8.0
13 101 103 3 8.0
14 101 103 4 20.0
15 101 103 5 16.0
16 101 104 1 20.0
17 101 104 2 8.0
18 101 104 3 8.0
....

5. 按输入格式得到推荐评分列表

对推荐结果列表，进行排序处理，输出排序后的推荐结果。 
key:用户ID 
val:推荐结果数据框

$key
[1] 1 1 1 1 1 1 1 2 2 2 2 2 2 2 3 3 3 3 3 3 3 4 4 4 4 4 4 4 5 5 5 5 5 5 5

$val
user item pref
1 1 101 44.0
2 1 103 39.0
3 1 104 33.5
4 1 102 31.5
5 1 106 18.0
6 1 105 15.5
7 1 107 5.0
8 2 101 45.5
9 2 103 41.5
10 2 104 36.0
11 2 102 32.5
12 2 106 20.5
13 2 105 15.5
14 2 107 4.0
15 3 101 40.0
16 3 104 38.0
17 3 105 26.0
18 3 103 24.5
19 3 102 18.5
20 3 106 16.5
21 3 107 15.5
22 4 101 63.0
23 4 104 55.0
24 4 103 53.5
25 4 102 37.0
26 4 106 33.0
27 4 105 26.0
28 4 107 9.5
29 5 101 68.0
30 5 104 59.0
31 5 103 56.5
32 5 102 42.5
33 5 106 34.5
34 5 105 32.0
35 5 107 11.5

rmr2使用提示：

1) rmr.options(backend = ‘hadoop’)

这里backend有两个值，hadoop,local。hadoop是默认值，使用hadoop环境运行程序。local是一个本地测试的设置，已经不建议再使用。我在开发时，试过local设置，运行速度非常快，模拟了hadoop的运行环境。但是，local模式下的代码，不能和hadoop模式下完全兼容，变动也比较大，因此不建议大家使用。

2) equijoin(…,outer=c(‘left’))

这里outer包括了4个值，c(“”, “left”, “right”, “full”)，非常像数据库中两个表的join操作

3) keyval(k,v)

mapReduce的操作，需要key和valve保存数据。如果直接输出，或者输出的未加key，会有一个警告Converting to.dfs argument to keyval with a NULL key。再上一篇文章中，rmr2的例子中就有类似的情况，请大家注意修改代码。

> to.dfs(1:10)

Warning message:
In to.dfs(1:10) : Converting to.dfs argument to keyval with a NULL key
代码部分：

#加载rmr2包
library(rmr2)

#输入数据文件
train<-read.csv(file="small.csv",header=FALSE)
names(train)<-c("user","item","pref") #使用rmr的hadoop格式，hadoop是默认设置。 rmr.options(backend = 'hadoop') #把数据集存入HDFS train.hdfs = to.dfs(keyval(train$user,train)) from.dfs(train.hdfs) > from.dfs(train.hdfs)

13/04/07 14:35:44 INFO util.NativeCodeLoader: Loaded the native-hadoop library
13/04/07 14:35:44 INFO zlib.ZlibFactory: Successfully loaded & initialized native-zlib library
13/04/07 14:35:44 INFO compress.CodecPool: Got brand-new decompressor
$key
[1] 1 1 1 2 2 2 2 3 3 3 3 4 4 4 4 5 5 5 5 5 5

$val
user item pref
1 1 101 5.0
2 1 102 3.0
3 1 103 2.5
4 2 101 2.0
5 2 102 2.5
6 2 103 5.0
7 2 104 2.0
8 3 101 2.0
9 3 104 4.0
10 3 105 4.5
11 3 107 5.0
12 4 101 5.0
13 4 103 3.0
14 4 104 4.5
15 4 106 4.0
16 5 101 4.0
17 5 102 3.0
18 5 103 2.0
19 5 104 4.0
20 5 105 3.5
21 5 106 4.0
#STEP 1, 建立物品的同现矩阵
# 1) 按用户分组，得到所有物品出现的组合列表。
train.mr<-mapreduce(
train.hdfs,
map = function(k, v) {
keyval(k,v$item)
}
,reduce=function(k,v){
m<-merge(v,v)
keyval(m$x,m$y)
}
)

from.dfs(train.mr)

$key
[1] 101 101 101 101 101 101 101 101 101 101 101 101 101 101 101 102 102 102 102
[20] 102 102 102 103 103 103 103 103 103 103 103 103 103 103 104 104 104 104 104
[39] 104 104 104 104 104 104 104 105 105 105 105 106 106 106 106 107 107 107 107
[58] 101 101 101 101 101 101 102 102 102 102 102 102 103 103 103 103 103 103 104
[77] 104 104 104 104 104 105 105 105 105 105 105 106 106 106 106 106 106

$val
[1] 101 102 103 101 102 103 104 101 104 105 107 101 103 104 106 101 102 103 101
[20] 102 103 104 101 102 103 101 102 103 104 101 103 104 106 101 102 103 104 101
[39] 104 105 107 101 103 104 106 101 104 105 107 101 103 104 106 101 104 105 107
[58] 101 102 103 104 105 106 101 102 103 104 105 106 101 102 103 104 105 106 101
[77] 102 103 104 105 106 101 102 103 104 105 106 101 102 103 104 105 106


# 2) 对物品组合列表进行计数，建立物品的同现矩阵
step2.mr<-mapreduce(
train.mr,
map = function(k, v) {
d<-data.frame(k,v)
d2<-ddply(d,.(k,v),count)

key<-d2$k
#val<-subset(d2,select=-k)
val0) val<-v[-which(is.na(v$user.r)),]
keyval(val$k.l,val)
}
,reduce=function(k,v){
val<-ddply(v,.(k.l,v.l,user.r),summarize,v=freq.l*pref.r)
keyval(val$k.l,val)
}
)
from.dfs(cal.mr)

$key
[1] 101 101 101 101 101 101 101 101 101 101 101 101 101 101 101 101 101 101
[19] 101 101 101 101 101 101 101 101 101 101 101 101 101 101 101 101 101 102
[37] 102 102 102 102 102 102 102 102 102 102 102 102 102 102 102 102 102 103
[55] 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103
[73] 103 103 103 103 103 104 104 104 104 104 104 104 104 104 104 104 104 104
[91] 104 104 104 104 104 104 104 104 104 104 104 104 104 104 104 105 105 105
[109] 105 105 105 105 105 105 105 105 105 105 105 106 106 106 106 106 106 106
[127] 106 106 106 106 106 107 107 107 107

$val
k.l v.l user.r v
1 101 101 1 25.0
2 101 101 2 10.0
3 101 101 3 10.0
4 101 101 4 25.0
5 101 101 5 20.0
6 101 102 1 15.0
7 101 102 2 6.0
8 101 102 3 6.0
9 101 102 4 15.0
10 101 102 5 12.0
11 101 103 1 20.0
12 101 103 2 8.0
13 101 103 3 8.0
14 101 103 4 20.0
15 101 103 5 16.0
16 101 104 1 20.0
17 101 104 2 8.0
18 101 104 3 8.0
19 101 104 4 20.0
20 101 104 5 16.0
21 101 105 1 10.0
22 101 105 2 4.0
23 101 105 3 4.0
24 101 105 4 10.0
25 101 105 5 8.0
26 101 106 1 10.0
27 101 106 2 4.0
28 101 106 3 4.0
29 101 106 4 10.0
30 101 106 5 8.0
31 101 107 1 5.0
32 101 107 2 2.0
33 101 107 3 2.0
34 101 107 4 5.0
35 101 107 5 4.0
36 102 101 1 9.0
37 102 101 2 7.5
38 102 101 5 9.0
39 102 102 1 9.0
40 102 102 2 7.5
41 102 102 5 9.0
42 102 103 1 9.0
43 102 103 2 7.5
44 102 103 5 9.0
45 102 104 1 6.0
46 102 104 2 5.0
47 102 104 5 6.0
48 102 105 1 3.0
49 102 105 2 2.5
50 102 105 5 3.0
51 102 106 1 3.0
52 102 106 2 2.5
53 102 106 5 3.0
54 103 101 1 10.0
55 103 101 2 20.0
56 103 101 4 12.0
57 103 101 5 8.0
58 103 102 1 7.5
59 103 102 2 15.0
60 103 102 4 9.0
61 103 102 5 6.0
62 103 103 1 10.0
63 103 103 2 20.0
64 103 103 4 12.0
65 103 103 5 8.0
66 103 104 1 7.5
67 103 104 2 15.0
68 103 104 4 9.0
69 103 104 5 6.0
70 103 105 1 2.5
71 103 105 2 5.0
72 103 105 4 3.0
73 103 105 5 2.0
74 103 106 1 5.0
75 103 106 2 10.0
76 103 106 4 6.0
77 103 106 5 4.0
78 104 101 2 8.0
79 104 101 3 16.0
80 104 101 4 18.0
81 104 101 5 16.0
82 104 102 2 4.0
83 104 102 3 8.0
84 104 102 4 9.0
85 104 102 5 8.0
86 104 103 2 6.0
87 104 103 3 12.0
88 104 103 4 13.5
89 104 103 5 12.0
90 104 104 2 8.0
91 104 104 3 16.0
92 104 104 4 18.0
93 104 104 5 16.0
94 104 105 2 4.0
95 104 105 3 8.0
96 104 105 4 9.0
97 104 105 5 8.0
98 104 106 2 4.0
99 104 106 3 8.0
100 104 106 4 9.0
101 104 106 5 8.0
102 104 107 2 2.0
103 104 107 3 4.0
104 104 107 4 4.5
105 104 107 5 4.0
106 105 101 3 9.0
107 105 101 5 7.0
108 105 102 3 4.5
109 105 102 5 3.5
110 105 103 3 4.5
111 105 103 5 3.5
112 105 104 3 9.0
113 105 104 5 7.0
114 105 105 3 9.0
115 105 105 5 7.0
116 105 106 3 4.5
117 105 106 5 3.5
118 105 107 3 4.5
119 105 107 5 3.5
120 106 101 4 8.0
121 106 101 5 8.0
122 106 102 4 4.0
123 106 102 5 4.0
124 106 103 4 8.0
125 106 103 5 8.0
126 106 104 4 8.0
127 106 104 5 8.0
128 106 105 4 4.0
129 106 105 5 4.0
130 106 106 4 8.0
131 106 106 5 8.0
132 107 101 3 5.0
133 107 104 3 5.0
134 107 105 3 5.0
135 107 107 3 5.0
#5. 按输入格式得到推荐评分列表
result.mr<-mapreduce(
input=cal.mr,
map=function(k,v){
keyval(v$user.r,v)
}
,reduce=function(k,v){
val<-ddply(v,.(user.r,v.l),summarize,v=sum(v))
val2<-val[order(val$v,decreasing=TRUE),]
names(val2)<-c("user","item","pref")
keyval(val2$user,val2)
}
)
from.dfs(result.mr)

$key
[1] 1 1 1 1 1 1 1 2 2 2 2 2 2 2 3 3 3 3 3 3 3 4 4 4 4 4 4 4 5 5 5 5 5 5 5

$val
user item pref
1 1 101 44.0
2 1 103 39.0
3 1 104 33.5
4 1 102 31.5
5 1 106 18.0
6 1 105 15.5
7 1 107 5.0
8 2 101 45.5
9 2 103 41.5
10 2 104 36.0
11 2 102 32.5
12 2 106 20.5
13 2 105 15.5
14 2 107 4.0
15 3 101 40.0
16 3 104 38.0
17 3 105 26.0
18 3 103 24.5
19 3 102 18.5
20 3 106 16.5
21 3 107 15.5
22 4 101 63.0
23 4 104 55.0
24 4 103 53.5
25 4 102 37.0
26 4 106 33.0
27 4 105 26.0
28 4 107 9.5
29 5 101 68.0
30 5 104 59.0
31 5 103 56.5
32 5 102 42.5
33 5 106 34.5
34 5 105 32.0
35 5 107 11.5

文章中提供了R用MapReduce方法，实现协同过滤算法的一种思路。

算法可能不是最优的，希望大家有时间写出更好的算法来！随着R语言及Hadoop的发展，相信会有越来越多的算法应用会使用这种方式！ 
如有问题请给我留言，我很高兴与大家讨论。

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