org.apache.mahout.math.hadoop.stats

Class StandardDeviationCalculatorReducer

java.lang.Object

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

org.apache.mahout.math.hadoop.stats.StandardDeviationCalculatorReducer

public class StandardDeviationCalculatorReducer
extends org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.IntWritable,org.apache.hadoop.io.DoubleWritable,org.apache.hadoop.io.IntWritable,org.apache.hadoop.io.DoubleWritable>

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
StandardDeviationCalculatorReducer()

Method Summary

Methods

Modifier and Type	Method and Description
protected void	reduce(org.apache.hadoop.io.IntWritable key, Iterable<org.apache.hadoop.io.DoubleWritable> 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

StandardDeviationCalculatorReducer

public StandardDeviationCalculatorReducer()

Method Detail

reduce

protected void reduce(org.apache.hadoop.io.IntWritable key,
          Iterable<org.apache.hadoop.io.DoubleWritable> 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.DoubleWritable,org.apache.hadoop.io.IntWritable,org.apache.hadoop.io.DoubleWritable>

Throws:

IOException

InterruptedException