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

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.Entropy
All Implemented Interfaces:
org.apache.hadoop.conf.Configurable, org.apache.hadoop.util.Tool

public final class Entropy
extends AbstractJob

A Hadoop job to compute the entropy of keys or values in a SequenceFile. Format has to be Text for key or value.


Constructor Summary
Entropy()
           
 
Method Summary
 long getNumberItems()
          Returns the number of elements in the file.
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

Entropy

public Entropy()
Method Detail

main

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

getNumberItems

public long getNumberItems()
Returns the number of elements in the file. Only works after run.

Returns:
The number of processed items

run

public int run(String[] args)
        throws IOException,
               ClassNotFoundException,
               InterruptedException
Throws:
IOException
ClassNotFoundException
InterruptedException


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