org.apache.mahout.vectorizer.term

Class TermDocumentCountReducer

java.lang.Object

org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.IntWritable,org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.IntWritable,org.apache.hadoop.io.LongWritable>

org.apache.mahout.vectorizer.term.TermDocumentCountReducer

public class TermDocumentCountReducer
extends org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.IntWritable,org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.IntWritable,org.apache.hadoop.io.LongWritable>

Can also be used as a local Combiner. This accumulates all the features and the weights and sums them up.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.mapreduce.Reducer

org.apache.hadoop.mapreduce.Reducer.Context

Constructor Summary

Constructors

Constructor and Description
TermDocumentCountReducer()

Method Summary

Modifier and Type	Method and Description
protected void	reduce(org.apache.hadoop.io.IntWritable key, Iterable<org.apache.hadoop.io.LongWritable> values, org.apache.hadoop.mapreduce.Reducer.Context context)

Methods inherited from class org.apache.hadoop.mapreduce.Reducer

cleanup, run, setup

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

TermDocumentCountReducer

public TermDocumentCountReducer()

Method Detail

reduce

protected void reduce(org.apache.hadoop.io.IntWritable key,
                      Iterable<org.apache.hadoop.io.LongWritable> values,
                      org.apache.hadoop.mapreduce.Reducer.Context context)
               throws IOException,
                      InterruptedException

Overrides:

reduce in class org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.IntWritable,org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.IntWritable,org.apache.hadoop.io.LongWritable>

Throws:

IOException

InterruptedException