org.apache.mahout.math.hadoop.stats

Class StandardDeviationCalculatorMapper

java.lang.Object

org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.IntWritable,org.apache.hadoop.io.Writable,org.apache.hadoop.io.IntWritable,org.apache.hadoop.io.DoubleWritable>

org.apache.mahout.math.hadoop.stats.StandardDeviationCalculatorMapper

public class StandardDeviationCalculatorMapper
extends org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.IntWritable,org.apache.hadoop.io.Writable,org.apache.hadoop.io.IntWritable,org.apache.hadoop.io.DoubleWritable>

Nested Class Summary

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

org.apache.hadoop.mapreduce.Mapper.Context

Field Summary

Fields

Modifier and Type	Field and Description
static org.apache.hadoop.io.IntWritable	SUM
static org.apache.hadoop.io.IntWritable	SUM_OF_SQUARES
static org.apache.hadoop.io.IntWritable	TOTAL_COUNT

Constructor Summary

Constructors

Constructor and Description
StandardDeviationCalculatorMapper()

Method Summary

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

Field Detail

SUM_OF_SQUARES

public static final org.apache.hadoop.io.IntWritable SUM_OF_SQUARES

SUM

public static final org.apache.hadoop.io.IntWritable SUM

TOTAL_COUNT

public static final org.apache.hadoop.io.IntWritable TOTAL_COUNT

Constructor Detail

StandardDeviationCalculatorMapper

public StandardDeviationCalculatorMapper()

Method Detail

map

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

Overrides:

map in class org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.IntWritable,org.apache.hadoop.io.Writable,org.apache.hadoop.io.IntWritable,org.apache.hadoop.io.DoubleWritable>

Throws:

IOException

InterruptedException