de.jungblut.nlp.mr

Class TfIdfCalculatorJob.DocumentVectorizerReducer

java.lang.Object

org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.Text,TextIntIntIntWritable,org.apache.hadoop.io.Text,VectorWritable>

de.jungblut.nlp.mr.TfIdfCalculatorJob.DocumentVectorizerReducer

Enclosing class:

TfIdfCalculatorJob

public static class TfIdfCalculatorJob.DocumentVectorizerReducer
extends org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.Text,TextIntIntIntWritable,org.apache.hadoop.io.Text,VectorWritable>

Calculate the sparse vector with TF-IDF.

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
DocumentVectorizerReducer()

Method Summary

Modifier and Type	Method and Description
protected void	reduce(org.apache.hadoop.io.Text key, Iterable<TextIntIntIntWritable> values, org.apache.hadoop.mapreduce.Reducer.Context context) Input is the document ID with several (token, document frequency, term frequency, token index) pairs.
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

DocumentVectorizerReducer

public DocumentVectorizerReducer()

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.Text,TextIntIntIntWritable,org.apache.hadoop.io.Text,VectorWritable>

Throws:

IOException

InterruptedException

reduce

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

Input is the document ID with several (token, document frequency, term frequency, token index) pairs.

Overrides:

reduce in class org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.Text,TextIntIntIntWritable,org.apache.hadoop.io.Text,VectorWritable>

Throws:

IOException

InterruptedException