org.apache.mahout.math.hadoop.stochasticsvd.qr

Class QRLastStep

java.lang.Object

org.apache.mahout.math.hadoop.stochasticsvd.qr.QRLastStep

All Implemented Interfaces:

Closeable, AutoCloseable, Iterator<Vector>

public class QRLastStep
extends Object
implements Closeable, Iterator<Vector>

Second/last step of QR iterations. Takes input of qtHats and rHats and provides iterator to pull ready rows of final Q.

Constructor Summary

Constructors

Constructor and Description
QRLastStep(Iterator<DenseBlockWritable> qHatInput, Iterator<VectorWritable> rHatInput, int blockNum)

Method Summary

Modifier and Type	Method and Description
void	close()
boolean	hasNext()
Vector	next()
void	remove()

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Iterator

forEachRemaining

Constructor Detail

QRLastStep

public QRLastStep(Iterator<DenseBlockWritable> qHatInput,
                  Iterator<VectorWritable> rHatInput,
                  int blockNum)

Parameters:

qHatInput - the Q-Hat input that was output in the first step

rHatInput - all RHat outputs int the group in order of groups

blockNum - our RHat number in the group

Method Detail

hasNext

public boolean hasNext()

Specified by:

hasNext in interface Iterator<Vector>

next

public Vector next()

Specified by:

next in interface Iterator<Vector>

remove

public void remove()

Specified by:

remove in interface Iterator<Vector>

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Throws:

IOException