org.apache.mahout.clustering.spectral

Class AffinityMatrixInputMapper

java.lang.Object

org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.Text,org.apache.hadoop.io.IntWritable,DistributedRowMatrix.MatrixEntryWritable>

org.apache.mahout.clustering.spectral.AffinityMatrixInputMapper

public class AffinityMatrixInputMapper
extends org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.Text,org.apache.hadoop.io.IntWritable,DistributedRowMatrix.MatrixEntryWritable>

Handles reading the files representing the affinity matrix. Since the affinity matrix is representative of a graph, each line in all the files should take the form:

i,j,value

where i and j are the ith and j data points in the entire set, and value represents some measurement of their relative absolute magnitudes. This is, simply, a method for representing a graph textually.

Nested Class Summary

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

org.apache.hadoop.mapreduce.Mapper.Context

Constructor Summary

Constructors

Constructor and Description
AffinityMatrixInputMapper()

Method Summary

Modifier and Type	Method and Description
protected void	map(org.apache.hadoop.io.LongWritable key, org.apache.hadoop.io.Text 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

AffinityMatrixInputMapper

public AffinityMatrixInputMapper()

Method Detail

map

protected void map(org.apache.hadoop.io.LongWritable key,
                   org.apache.hadoop.io.Text value,
                   org.apache.hadoop.mapreduce.Mapper.Context context)
            throws IOException,
                   InterruptedException

Overrides:

map in class org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.Text,org.apache.hadoop.io.IntWritable,DistributedRowMatrix.MatrixEntryWritable>

Throws:

IOException

InterruptedException