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

java.lang.Object
  extended by org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.DoubleWritable,org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.DoubleWritable>
      extended by org.apache.mahout.math.stats.entropy.CalculateEntropyReducer

public final class CalculateEntropyReducer
extends org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.DoubleWritable,org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.DoubleWritable>

Subtracts the partial entropy.


Nested Class Summary
 
Nested classes/interfaces inherited from class org.apache.hadoop.mapreduce.Reducer
org.apache.hadoop.mapreduce.Reducer.Context
 
Constructor Summary
CalculateEntropyReducer()
           
 
Method Summary
protected  void reduce(org.apache.hadoop.io.NullWritable key, Iterable<org.apache.hadoop.io.DoubleWritable> values, org.apache.hadoop.mapreduce.Reducer.Context context)
           
protected  void setup(org.apache.hadoop.mapreduce.Reducer.Context context)
           
 
Methods inherited from class org.apache.hadoop.mapreduce.Reducer
cleanup, run
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

CalculateEntropyReducer

public CalculateEntropyReducer()
Method Detail

setup

protected void setup(org.apache.hadoop.mapreduce.Reducer.Context context)
              throws IOException,
                     InterruptedException
Overrides:
setup in class org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.DoubleWritable,org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.DoubleWritable>
Throws:
IOException
InterruptedException

reduce

protected void reduce(org.apache.hadoop.io.NullWritable key,
                      Iterable<org.apache.hadoop.io.DoubleWritable> values,
                      org.apache.hadoop.mapreduce.Reducer.Context context)
               throws IOException,
                      InterruptedException
Overrides:
reduce in class org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.DoubleWritable,org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.DoubleWritable>
Throws:
IOException
InterruptedException


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