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

java.lang.Object
  extended by 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>
      extended by 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
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
StandardDeviationCalculatorMapper()
           
 
Method Summary
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


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