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

java.lang.Object
  extended by org.apache.hadoop.mapreduce.Mapper<Object,org.apache.hadoop.io.Writable,org.apache.hadoop.io.Writable,VarIntWritable>
      extended by org.apache.mahout.math.stats.entropy.ValueCounterMapper

public final class ValueCounterMapper
extends org.apache.hadoop.mapreduce.Mapper<Object,org.apache.hadoop.io.Writable,org.apache.hadoop.io.Writable,VarIntWritable>

Emits the value and the count of 1 as VarIntWritable.


Nested Class Summary
 
Nested classes/interfaces inherited from class org.apache.hadoop.mapreduce.Mapper
org.apache.hadoop.mapreduce.Mapper.Context
 
Constructor Summary
ValueCounterMapper()
           
 
Method Summary
 void map(Object key, org.apache.hadoop.io.Writable value, org.apache.hadoop.mapreduce.Mapper.Context context)
           
 
Methods inherited from class org.apache.hadoop.mapreduce.Mapper
cleanup, run, setup
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

ValueCounterMapper

public ValueCounterMapper()
Method Detail

map

public void map(Object key,
                org.apache.hadoop.io.Writable value,
                org.apache.hadoop.mapreduce.Mapper.Context context)
         throws IOException,
                InterruptedException
Overrides:
map in class org.apache.hadoop.mapreduce.Mapper<Object,org.apache.hadoop.io.Writable,org.apache.hadoop.io.Writable,VarIntWritable>
Throws:
IOException
InterruptedException


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