org.apache.mahout.fpm.pfpgrowth
Class ParallelFPGrowthReducer

java.lang.Object
  extended by org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.IntWritable,TransactionTree,org.apache.hadoop.io.Text,TopKStringPatterns>
      extended by org.apache.mahout.fpm.pfpgrowth.ParallelFPGrowthReducer

public final class ParallelFPGrowthReducer
extends org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.IntWritable,TransactionTree,org.apache.hadoop.io.Text,TopKStringPatterns>

takes each group of transactions and runs Vanilla FPGrowth on it and outputs the the Top K frequent Patterns for each group.


Nested Class Summary
 
Nested classes/interfaces inherited from class org.apache.hadoop.mapreduce.Reducer
org.apache.hadoop.mapreduce.Reducer.Context
 
Constructor Summary
ParallelFPGrowthReducer()
           
 
Method Summary
protected  void reduce(org.apache.hadoop.io.IntWritable key, Iterable<TransactionTree> values, org.apache.hadoop.mapreduce.Reducer.Context context)
           
protected  void setup(org.apache.hadoop.mapreduce.Reducer.Context context)
           
 
Methods inherited from class org.apache.hadoop.mapreduce.Reducer
cleanup, run
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

ParallelFPGrowthReducer

public ParallelFPGrowthReducer()
Method Detail

reduce

protected void reduce(org.apache.hadoop.io.IntWritable key,
                      Iterable<TransactionTree> values,
                      org.apache.hadoop.mapreduce.Reducer.Context context)
               throws IOException
Overrides:
reduce in class org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.IntWritable,TransactionTree,org.apache.hadoop.io.Text,TopKStringPatterns>
Throws:
IOException

setup

protected void setup(org.apache.hadoop.mapreduce.Reducer.Context context)
              throws IOException,
                     InterruptedException
Overrides:
setup in class org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.IntWritable,TransactionTree,org.apache.hadoop.io.Text,TopKStringPatterns>
Throws:
IOException
InterruptedException


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