org.apache.mahout.math.hadoop.stochasticsvd
Class BtJob.BtMapper

java.lang.Object
  extended by org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.Writable,VectorWritable,org.apache.hadoop.io.LongWritable,SparseRowBlockWritable>
      extended by org.apache.mahout.math.hadoop.stochasticsvd.BtJob.BtMapper
Enclosing class:
BtJob

public static class BtJob.BtMapper
extends org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.Writable,VectorWritable,org.apache.hadoop.io.LongWritable,SparseRowBlockWritable>


Nested Class Summary
 
Nested classes/interfaces inherited from class org.apache.hadoop.mapreduce.Mapper
org.apache.hadoop.mapreduce.Mapper.Context
 
Constructor Summary
BtJob.BtMapper()
           
 
Method Summary
protected  void cleanup(org.apache.hadoop.mapreduce.Mapper.Context context)
           
protected  void map(org.apache.hadoop.io.Writable key, VectorWritable value, org.apache.hadoop.mapreduce.Mapper.Context context)
          We maintain A and QtHat inputs partitioned the same way, so we essentially are performing map-side merge here of A and QtHats except QtHat is stored not row-wise but block-wise.
protected  void setup(org.apache.hadoop.mapreduce.Mapper.Context context)
           
 
Methods inherited from class org.apache.hadoop.mapreduce.Mapper
run
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

BtJob.BtMapper

public BtJob.BtMapper()
Method Detail

map

protected void map(org.apache.hadoop.io.Writable key,
                   VectorWritable value,
                   org.apache.hadoop.mapreduce.Mapper.Context context)
            throws IOException,
                   InterruptedException
We maintain A and QtHat inputs partitioned the same way, so we essentially are performing map-side merge here of A and QtHats except QtHat is stored not row-wise but block-wise.

Overrides:
map in class org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.Writable,VectorWritable,org.apache.hadoop.io.LongWritable,SparseRowBlockWritable>
Throws:
IOException
InterruptedException

setup

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

cleanup

protected void cleanup(org.apache.hadoop.mapreduce.Mapper.Context context)
                throws IOException,
                       InterruptedException
Overrides:
cleanup in class org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.Writable,VectorWritable,org.apache.hadoop.io.LongWritable,SparseRowBlockWritable>
Throws:
IOException
InterruptedException


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