org.apache.mahout.cf.taste.hadoop.als
Class PredictionMapper

java.lang.Object
  extended by org.apache.hadoop.mapreduce.Mapper<K1,V1,K2,V2>
      extended by org.apache.mahout.cf.taste.hadoop.als.SharingMapper<org.apache.hadoop.io.IntWritable,VectorWritable,org.apache.hadoop.io.LongWritable,RecommendedItemsWritable,Pair<OpenIntObjectHashMap<Vector>,OpenIntObjectHashMap<Vector>>>
          extended by org.apache.mahout.cf.taste.hadoop.als.PredictionMapper

public class PredictionMapper
extends SharingMapper<org.apache.hadoop.io.IntWritable,VectorWritable,org.apache.hadoop.io.LongWritable,RecommendedItemsWritable,Pair<OpenIntObjectHashMap<Vector>,OpenIntObjectHashMap<Vector>>>

a multithreaded mapper that loads the feature matrices U and M into memory. Afterwards it computes recommendations from these. Can be executed by a MultithreadedSharingMapper.


Nested Class Summary
 
Nested classes/interfaces inherited from class org.apache.hadoop.mapreduce.Mapper
org.apache.hadoop.mapreduce.Mapper.Context
 
Constructor Summary
PredictionMapper()
           
 
Method Summary
protected  void map(org.apache.hadoop.io.IntWritable userIndexWritable, VectorWritable ratingsWritable, org.apache.hadoop.mapreduce.Mapper.Context ctx)
           
protected  void setup(org.apache.hadoop.mapreduce.Mapper.Context ctx)
           
 
Methods inherited from class org.apache.hadoop.mapreduce.Mapper
cleanup, run
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

PredictionMapper

public PredictionMapper()
Method Detail

setup

protected void setup(org.apache.hadoop.mapreduce.Mapper.Context ctx)
              throws IOException,
                     InterruptedException
Overrides:
setup in class org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.IntWritable,VectorWritable,org.apache.hadoop.io.LongWritable,RecommendedItemsWritable>
Throws:
IOException
InterruptedException

map

protected void map(org.apache.hadoop.io.IntWritable userIndexWritable,
                   VectorWritable ratingsWritable,
                   org.apache.hadoop.mapreduce.Mapper.Context ctx)
            throws IOException,
                   InterruptedException
Overrides:
map in class org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.IntWritable,VectorWritable,org.apache.hadoop.io.LongWritable,RecommendedItemsWritable>
Throws:
IOException
InterruptedException


Copyright © 2008–2014 The Apache Software Foundation. All rights reserved.