org.apache.mahout.cf.taste.hadoop.als
Class PredictionMapper
java.lang.Object
org.apache.hadoop.mapreduce.Mapper<K1,V1,K2,V2>
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>>>
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 classes/interfaces inherited from class org.apache.hadoop.mapreduce.Mapper |
org.apache.hadoop.mapreduce.Mapper.Context |
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 |
PredictionMapper
public PredictionMapper()
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
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