Installing/setting up mahout and Building a Recommender System

Part 1: installing mahout

Step 1:

Install m2eclipse from within eclipse using the link below:

http://download.eclipse.org/technology/m2e/releases

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

Goto: https://mahout.apache.org/users/basics/quickstart.html

downloads.html

And copy: For Maven users please include the following snippet in your pom:

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">

<groupId>com.cold-start-rsystem</groupId>

<artifactId>cold-start</artifactId>

<version>0.0.1-SNAPSHOT</version>

<name>cold-start</name>

<url>http://maven.apache.org</url>

<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

</properties>

<groupId>junit</groupId>

<artifactId>junit</artifactId>

</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">

<groupId>com.cold-start-rsystem</groupId>

<artifactId>cold-start</artifactId>

<version>0.0.1-SNAPSHOT</version>

<name>cold-start</name>

<url>http://maven.apache.org</url>

<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

</properties>

<dependency>

<groupId>org.apache.mahout</groupId>

<artifactId>mahout-core</artifactId>

<version>0.9</version>

</dependency>

<groupId>junit</groupId>

<artifactId>junit</artifactId>

</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. Download your version from: http://www.whoishostingthis.com/mirrors/apache/mahout/

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

Data Analytics and Predictive Analytics, Inferential Statistics and CRISP-DM process model

Sunday, 21 June 2015

step to set up mahout and maven in eclipse

To the Official Release site: https://mahout.apache.org/general/downloads.html