org.apache.mahout.classifier.bayes.mapreduce.bayes
Class BayesThetaNormalizerMapper

java.lang.Object
  extended by org.apache.hadoop.mapred.MapReduceBase
      extended by org.apache.mahout.classifier.bayes.mapreduce.bayes.BayesThetaNormalizerMapper
All Implemented Interfaces:
Closeable, org.apache.hadoop.mapred.JobConfigurable, org.apache.hadoop.mapred.Mapper<StringTuple,org.apache.hadoop.io.DoubleWritable,StringTuple,org.apache.hadoop.io.DoubleWritable>

public class BayesThetaNormalizerMapper
extends org.apache.hadoop.mapred.MapReduceBase
implements org.apache.hadoop.mapred.Mapper<StringTuple,org.apache.hadoop.io.DoubleWritable,StringTuple,org.apache.hadoop.io.DoubleWritable>

Mapper for Calculating the ThetaNormalizer for a label in Naive Bayes Algorithm


Constructor Summary
BayesThetaNormalizerMapper()
           
 
Method Summary
 void configure(org.apache.hadoop.mapred.JobConf job)
           
 void map(StringTuple key, org.apache.hadoop.io.DoubleWritable value, org.apache.hadoop.mapred.OutputCollector<StringTuple,org.apache.hadoop.io.DoubleWritable> output, org.apache.hadoop.mapred.Reporter reporter)
          We need to calculate the thetaNormalization factor of each label
 
Methods inherited from class org.apache.hadoop.mapred.MapReduceBase
close
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 
Methods inherited from interface java.io.Closeable
close
 

Constructor Detail

BayesThetaNormalizerMapper

public BayesThetaNormalizerMapper()
Method Detail

map

public void map(StringTuple key,
                org.apache.hadoop.io.DoubleWritable value,
                org.apache.hadoop.mapred.OutputCollector<StringTuple,org.apache.hadoop.io.DoubleWritable> output,
                org.apache.hadoop.mapred.Reporter reporter)
         throws IOException
We need to calculate the thetaNormalization factor of each label

Specified by:
map in interface org.apache.hadoop.mapred.Mapper<StringTuple,org.apache.hadoop.io.DoubleWritable,StringTuple,org.apache.hadoop.io.DoubleWritable>
Parameters:
key - The label,feature pair
value - The tfIdf of the pair
Throws:
IOException

configure

public void configure(org.apache.hadoop.mapred.JobConf job)
Specified by:
configure in interface org.apache.hadoop.mapred.JobConfigurable
Overrides:
configure in class org.apache.hadoop.mapred.MapReduceBase


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