Installing/setting up
mahout and Building a Recommender System
Part 1: installing
mahout
Step 1:
Install m2eclipse from within eclipse using the link below:
Start eclipse > help > install new software > Add
> enter m2eclipe as name and paste the URL above into the URL field. Next
> install (this will take a while) > next > next > accept agreement
… > next > restart eclipse to complete installation
Part 2: Building a
User Recommender System
Step 1: create a
project in eclipse
Creating the project: File > new > others > maven
project > next > select eg quickstart > enter names eg:
group id: com.recommender
artifacts id: RecommenderApp
package: com.recommender1.RecommenderApp1
Click on Finish
The project will be created in eclipse and the source file
will be located under:
project-name/src/main/java
Issues you might encounter:
1.
The build path
error/warning:
log4j:WARN Please initialize the log4j
system properly.
log4j:WARN See
http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
To eliminate the build path warning in eclipse > right
click on project > properties > java build path > libraries > add
library > JRE System library > Alternative JRE > select JRE System library
1.5 > Remove
Edit pom.xm;l
To the Official
Release site: https://mahout.apache.org/general/downloads.html
In eclipse ecpand the project and fine the
file pom.xml > double click on it and it will show on the right side of the
workspace (underneath) >
Click on the pom.xml and it will open the
following:
BEFORE:
-----------------------------------------------------------------------------------------------------------------------
<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>com.cold-start-rsystem</groupId>
<artifactId>cold-start</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>cold-start</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>
--------------------------------------------------------------------------------
Add the below to the file:
<dependency>
<groupId>org.apache.mahout</groupId>
<artifactId>mahout-core</artifactId>
<version>${mahout.version}</version>
</dependency>
So once again: in eclipse > click on pom.xml on the
bottom of the page > paste it in just above the last entry as shown below:
AFTER:
---------------------------------------------------------------------------------------------------------------
<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>com.cold-start-rsystem</groupId>
<artifactId>cold-start</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>cold-start</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependency>
<groupId>org.apache.mahout</groupId>
<artifactId>mahout-core</artifactId>
<version>0.9</version>
</dependency>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>
Edit the version to
correspond with your version as shown above for version 0.9
1.
eg enter 0.9 like: <version>0.9</version>
2.
Select all (ctrl + A)
3.
Space it all nicely (ctrl + i)
4.
Save it (ctrl + s)
5.
Close > . This is the end of the quick
start outlined here: https://mahout.apache.org/users/basics/quickstart.html
Next step: Get the
dataset and add the dataset
1.
Get the dataset eg from movielens or from link
below: https://mahout.apache.org/users/recommender/userbased-5-minutes.html
2.
Copy the data
3.
Create folder in the project: right click on
project > new > folder > name it eg data
4.
Create file in the newly created folder: right
click on the folder > new file > name it eg dataset.csv > drag and
drop the file to the work-area of eclipse (it has to be an empty wordarea) >
paste the data into it > save it: ctrl +s > close it
5.
Now to the projectApp (RecommenderApp) >
src/main/java > com/App.java
Issues: error import cannot be
resolved ….
The import org.apache cannot be
resolved
Resolution: download and import maven libraries
1.
unzip to a directory
2.
from eclipse import the libraries: right click
on the project > build path > configure build path > libraries >
add external jar files > browse to the directory > click on
3.
mahout-core-0.9.jar > open
4.
mahout-core-0.9-job.jar > open
5.
mahout-integration-0.9.jar > open
6.
mahout-math-0.9.jar (if needed) > open
Issues and problem
encountered:
SLF4J: Failed to load class
"org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP)
logger implementation
SLF4J: See
http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
Resolution is:
1.
Create a folder called lib
2.
Download the file slf4j-nop-1.7.5 from (make
sure it is a trusted site): http://mvnrepository.com/artifact/org.slf4j/slf4j-nop/1.7.5
3.
drag the file to the lib folder created in the
project
4.
right click on the file – slf4j-nop-1.7.5 >
build path > add to build path > refresh project > run project and
issue should be resolved
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