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

java.lang.Object
  extended by org.apache.hadoop.conf.Configured
      extended by org.apache.mahout.common.AbstractJob
          extended by org.apache.mahout.cf.taste.hadoop.als.FactorizationEvaluator
All Implemented Interfaces:
org.apache.hadoop.conf.Configurable, org.apache.hadoop.util.Tool

public class FactorizationEvaluator
extends AbstractJob

Measures the root-mean-squared error of a rating matrix factorization against a test set.

Command line arguments specific to this class are:

  1. --output (path): path where output should go
  2. --pairs (path): path containing the test ratings, each line must be userID,itemID,rating
  3. --userFeatures (path): path to the user feature matrix
  4. --itemFeatures (path): path to the item feature matrix


Nested Class Summary
static class FactorizationEvaluator.PredictRatingsMapper
           
 
Field Summary
 
Fields inherited from class org.apache.mahout.common.AbstractJob
argMap, inputFile, inputPath, outputFile, outputPath, tempPath
 
Constructor Summary
FactorizationEvaluator()
           
 
Method Summary
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

FactorizationEvaluator

public FactorizationEvaluator()
Method Detail

main

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

run

public int run(String[] args)
        throws Exception
Throws:
Exception


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