org.apache.mahout.math.stats.entropy
Class InformationGain

java.lang.Object
  extended by org.apache.hadoop.conf.Configured
      extended by org.apache.mahout.common.AbstractJob
          extended by org.apache.mahout.math.stats.entropy.InformationGain
All Implemented Interfaces:
org.apache.hadoop.conf.Configurable, org.apache.hadoop.util.Tool

public final class InformationGain
extends AbstractJob

Calculates the information gain for a SequenceFile. Computes, how 'useful' are the keys when predicting the values.


Constructor Summary
InformationGain()
           
 
Method Summary
 double getConditionalEntropy()
           
 double getEntropy()
           
 double getInformationGain()
           
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, getAnalyzerClassFromOption, getCLIOption, getCombinedTempPath, getGroup, getInputPath, getOption, getOption, getOutputPath, getOutputPath, getTempPath, getTempPath, hasOption, keyFor, maybePut, parseArguments, parseDirectories, prepareJob, prepareJob, prepareJob, setS3SafeCombinedInputPath, shouldRunNextPhase
 
Methods inherited from class org.apache.hadoop.conf.Configured
getConf, setConf
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 
Methods inherited from interface org.apache.hadoop.conf.Configurable
getConf, setConf
 

Constructor Detail

InformationGain

public InformationGain()
Method Detail

main

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

run

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

getEntropy

public double getEntropy()

getConditionalEntropy

public double getConditionalEntropy()

getInformationGain

public double getInformationGain()


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