org.apache.mahout.math.hadoop.stochasticsvd

Class BtJob.OuterProductCombiner

java.lang.Object

org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.Writable,SparseRowBlockWritable,org.apache.hadoop.io.Writable,SparseRowBlockWritable>

org.apache.mahout.math.hadoop.stochasticsvd.BtJob.OuterProductCombiner

Enclosing class:

BtJob

public static class BtJob.OuterProductCombiner
extends org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.Writable,SparseRowBlockWritable,org.apache.hadoop.io.Writable,SparseRowBlockWritable>

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.mapreduce.Reducer

org.apache.hadoop.mapreduce.Reducer.Context

Field Summary

Fields

Modifier and Type	Field and Description
protected SparseRowBlockWritable	accum
protected int	blockHeight
protected Deque<Closeable>	closeables

Constructor Summary

Constructors

Constructor and Description
OuterProductCombiner()

Method Summary

Modifier and Type	Method and Description
protected void	cleanup(org.apache.hadoop.mapreduce.Reducer.Context context)
protected void	reduce(org.apache.hadoop.io.Writable key, Iterable<SparseRowBlockWritable> values, org.apache.hadoop.mapreduce.Reducer.Context context)
protected void	setup(org.apache.hadoop.mapreduce.Reducer.Context context)

Methods inherited from class org.apache.hadoop.mapreduce.Reducer

run

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

accum

protected final SparseRowBlockWritable accum

closeables

protected final Deque<Closeable> closeables

blockHeight

protected int blockHeight

Constructor Detail

OuterProductCombiner

public OuterProductCombiner()

Method Detail

setup

protected void setup(org.apache.hadoop.mapreduce.Reducer.Context context)
              throws IOException,
                     InterruptedException

Overrides:

setup in class org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.Writable,SparseRowBlockWritable,org.apache.hadoop.io.Writable,SparseRowBlockWritable>

Throws:

IOException

InterruptedException

reduce

protected void reduce(org.apache.hadoop.io.Writable key,
                      Iterable<SparseRowBlockWritable> values,
                      org.apache.hadoop.mapreduce.Reducer.Context context)
               throws IOException,
                      InterruptedException

Overrides:

reduce in class org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.Writable,SparseRowBlockWritable,org.apache.hadoop.io.Writable,SparseRowBlockWritable>

Throws:

IOException

InterruptedException

cleanup

protected void cleanup(org.apache.hadoop.mapreduce.Reducer.Context context)
                throws IOException,
                       InterruptedException

Overrides:

cleanup in class org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.Writable,SparseRowBlockWritable,org.apache.hadoop.io.Writable,SparseRowBlockWritable>

Throws:

IOException

InterruptedException