org.apache.mahout.cf.taste.hadoop.als

Class ParallelALSFactorizationJob

java.lang.Object

org.apache.hadoop.conf.Configured

org.apache.mahout.common.AbstractJob

org.apache.mahout.cf.taste.hadoop.als.ParallelALSFactorizationJob

All Implemented Interfaces:

org.apache.hadoop.conf.Configurable, org.apache.hadoop.util.Tool

public class ParallelALSFactorizationJob
extends AbstractJob

MapReduce implementation of the two factorization algorithms described in

"Large-scale Parallel Collaborative Filtering for the Netflix Prize" available at http://www.hpl.hp.com/personal/Robert_Schreiber/papers/2008%20AAIM%20Netflix/netflix_aaim08(submitted).pdf.

"

Collaborative Filtering for Implicit Feedback Datasets" available at http://research.yahoo.com/pub/2433

Command line arguments specific to this class are:

1. --input (path): Directory containing one or more text files with the dataset
2. --output (path): path where output should go
3. --lambda (double): regularization parameter to avoid overfitting
4. --userFeatures (path): path to the user feature matrix
5. --itemFeatures (path): path to the item feature matrix
6. --numThreadsPerSolver (int): threads to use per solver mapper, (default: 1)

Field Summary

Fields inherited from class org.apache.mahout.common.AbstractJob

argMap, inputFile, inputPath, outputFile, outputPath, tempPath

Constructor Summary

Constructors

Constructor and Description
ParallelALSFactorizationJob()

Method Summary

Methods

Modifier and Type	Method and Description
static void	main(String[] args)
int	run(String[] args)

Methods inherited from class org.apache.mahout.common.AbstractJob

addFlag, addInputOption, addOption, addOption, addOption, addOption, addOutputOption, buildOption, buildOption, getAnalyzerClassFromOption, getCLIOption, getConf, getDimensions, getFloat, getFloat, getGroup, getInputFile, getInputPath, getInt, getInt, getOption, getOption, getOption, getOptions, getOutputFile, getOutputPath, getOutputPath, getTempPath, getTempPath, hasOption, keyFor, maybePut, parseArguments, parseArguments, parseDirectories, prepareJob, prepareJob, prepareJob, prepareJob, setConf, setS3SafeCombinedInputPath, shouldRunNextPhase

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ParallelALSFactorizationJob

public ParallelALSFactorizationJob()

Method Detail

main

public static void main(String[] args)
                 throws Exception

Throws:

Exception

run

public int run(String[] args)
        throws Exception

Throws:

Exception