org.apache.mahout.cf.taste.hadoop.pseudo
Class RecommenderReducer
java.lang.Object
org.apache.hadoop.mapred.MapReduceBase
org.apache.mahout.cf.taste.hadoop.pseudo.RecommenderReducer
- All Implemented Interfaces:
- java.io.Closeable, org.apache.hadoop.mapred.JobConfigurable, org.apache.hadoop.mapred.Reducer<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.LongWritable,RecommendedItemsWritable>
public final class RecommenderReducer
- extends org.apache.hadoop.mapred.MapReduceBase
- implements org.apache.hadoop.mapred.Reducer<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.LongWritable,RecommendedItemsWritable>
The Reducer
which takes as input the user IDs parsed out by the map phase, and for each unique user
ID, computes recommendations with the configured Recommender
. The results are output as
RecommendedItemsWritable
.
- See Also:
RecommenderJob
Method Summary |
void |
configure(org.apache.hadoop.mapred.JobConf jobConf)
|
void |
reduce(org.apache.hadoop.io.LongWritable key,
java.util.Iterator<org.apache.hadoop.io.NullWritable> values,
org.apache.hadoop.mapred.OutputCollector<org.apache.hadoop.io.LongWritable,RecommendedItemsWritable> 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 |
RecommenderReducer
public RecommenderReducer()
configure
public void configure(org.apache.hadoop.mapred.JobConf jobConf)
- Specified by:
configure
in interface org.apache.hadoop.mapred.JobConfigurable
- Overrides:
configure
in class org.apache.hadoop.mapred.MapReduceBase
reduce
public void reduce(org.apache.hadoop.io.LongWritable key,
java.util.Iterator<org.apache.hadoop.io.NullWritable> values,
org.apache.hadoop.mapred.OutputCollector<org.apache.hadoop.io.LongWritable,RecommendedItemsWritable> output,
org.apache.hadoop.mapred.Reporter reporter)
throws java.io.IOException
- Specified by:
reduce
in interface org.apache.hadoop.mapred.Reducer<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.LongWritable,RecommendedItemsWritable>
- Throws:
java.io.IOException
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