org.apache.mahout.cf.taste.hadoop.cooccurence
Class ItemSimilarityEstimator.ItemItemReducer

java.lang.Object
  extended by org.apache.hadoop.mapred.MapReduceBase
      extended by org.apache.mahout.cf.taste.hadoop.cooccurence.ItemSimilarityEstimator.ItemItemReducer
All Implemented Interfaces:
java.io.Closeable, org.apache.hadoop.mapred.JobConfigurable, org.apache.hadoop.mapred.Reducer<Bigram,Bigram,Bigram,org.apache.hadoop.io.DoubleWritable>
Enclosing class:
ItemSimilarityEstimator

public static class ItemSimilarityEstimator.ItemItemReducer
extends org.apache.hadoop.mapred.MapReduceBase
implements org.apache.hadoop.mapred.Reducer<Bigram,Bigram,Bigram,org.apache.hadoop.io.DoubleWritable>

All sorted bigrams for item1 are recieved in reduce.

K -> (item1, item2), V -> (FREQ)


Constructor Summary
ItemSimilarityEstimator.ItemItemReducer()
           
 
Method Summary
 void configure(org.apache.hadoop.mapred.JobConf conf)
           
 void reduce(Bigram item, java.util.Iterator<Bigram> simItemItr, org.apache.hadoop.mapred.OutputCollector<Bigram,org.apache.hadoop.io.DoubleWritable> output, org.apache.hadoop.mapred.Reporter reporter)
           
 
Methods inherited from class org.apache.hadoop.mapred.MapReduceBase
close
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 
Methods inherited from interface java.io.Closeable
close
 

Constructor Detail

ItemSimilarityEstimator.ItemItemReducer

public ItemSimilarityEstimator.ItemItemReducer()
Method Detail

configure

public void configure(org.apache.hadoop.mapred.JobConf conf)
Specified by:
configure in interface org.apache.hadoop.mapred.JobConfigurable
Overrides:
configure in class org.apache.hadoop.mapred.MapReduceBase

reduce

public void reduce(Bigram item,
                   java.util.Iterator<Bigram> simItemItr,
                   org.apache.hadoop.mapred.OutputCollector<Bigram,org.apache.hadoop.io.DoubleWritable> output,
                   org.apache.hadoop.mapred.Reporter reporter)
            throws java.io.IOException
Specified by:
reduce in interface org.apache.hadoop.mapred.Reducer<Bigram,Bigram,Bigram,org.apache.hadoop.io.DoubleWritable>
Throws:
java.io.IOException


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