org.apache.mahout.math.hadoop

Class TimesSquaredJob.TimesSquaredMapper<T extends org.apache.hadoop.io.WritableComparable>

java.lang.Object

org.apache.hadoop.mapreduce.Mapper<T,VectorWritable,org.apache.hadoop.io.NullWritable,VectorWritable>

org.apache.mahout.math.hadoop.TimesSquaredJob.TimesSquaredMapper<T>

Direct Known Subclasses:

TimesSquaredJob.TimesMapper

Enclosing class:

TimesSquaredJob

public static class TimesSquaredJob.TimesSquaredMapper<T extends org.apache.hadoop.io.WritableComparable>
extends org.apache.hadoop.mapreduce.Mapper<T,VectorWritable,org.apache.hadoop.io.NullWritable,VectorWritable>

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
TimesSquaredMapper()

Method Summary

Modifier and Type	Method and Description
protected void	cleanup(org.apache.hadoop.mapreduce.Mapper.Context ctx)
protected void	map(T key, VectorWritable v, org.apache.hadoop.mapreduce.Mapper.Context context)
protected double	scale(VectorWritable v)
protected void	setup(org.apache.hadoop.mapreduce.Mapper.Context ctx)

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

run

Methods inherited from class java.lang.Object

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

Constructor Detail

TimesSquaredMapper

public TimesSquaredMapper()

Method Detail

setup

protected void setup(org.apache.hadoop.mapreduce.Mapper.Context ctx)
              throws IOException,
                     InterruptedException

Overrides:

setup in class org.apache.hadoop.mapreduce.Mapper<T extends org.apache.hadoop.io.WritableComparable,VectorWritable,org.apache.hadoop.io.NullWritable,VectorWritable>

Throws:

IOException

InterruptedException

map

protected void map(T key,
                   VectorWritable v,
                   org.apache.hadoop.mapreduce.Mapper.Context context)
            throws IOException,
                   InterruptedException

Overrides:

map in class org.apache.hadoop.mapreduce.Mapper<T extends org.apache.hadoop.io.WritableComparable,VectorWritable,org.apache.hadoop.io.NullWritable,VectorWritable>

Throws:

IOException

InterruptedException

scale

protected double scale(VectorWritable v)

cleanup

protected void cleanup(org.apache.hadoop.mapreduce.Mapper.Context ctx)
                throws IOException,
                       InterruptedException

Overrides:

cleanup in class org.apache.hadoop.mapreduce.Mapper<T extends org.apache.hadoop.io.WritableComparable,VectorWritable,org.apache.hadoop.io.NullWritable,VectorWritable>

Throws:

IOException

InterruptedException