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

Class QRFirstStep

java.lang.Object

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

All Implemented Interfaces:

Closeable, AutoCloseable, org.apache.hadoop.mapred.OutputCollector<org.apache.hadoop.io.Writable,Vector>

public class QRFirstStep
extends Object
implements Closeable, org.apache.hadoop.mapred.OutputCollector<org.apache.hadoop.io.Writable,Vector>

QR first step without MR abstractions and doing it just in terms of iterators and collectors. (although Collector is probably an outdated api).

Field Summary

Fields

Modifier and Type	Field and Description
static String	PROP_AROWBLOCK_SIZE
static String	PROP_K
static String	PROP_P

Constructor Summary

Constructors

Constructor and Description
QRFirstStep(org.apache.hadoop.conf.Configuration jobConf, org.apache.hadoop.mapred.OutputCollector<? super org.apache.hadoop.io.Writable,? super DenseBlockWritable> qtHatOut, org.apache.hadoop.mapred.OutputCollector<? super org.apache.hadoop.io.Writable,? super VectorWritable> rHatOut)

Method Summary

Modifier and Type	Method and Description
protected void	cleanup()
void	close()
void	collect(org.apache.hadoop.io.Writable key, Vector vw)
int	getKP()
protected void	map(Vector incomingYRow)
protected void	setup()

Methods inherited from class java.lang.Object

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

Field Detail

PROP_K

public static final String PROP_K

See Also:

Constant Field Values

PROP_P

public static final String PROP_P

See Also:

Constant Field Values

PROP_AROWBLOCK_SIZE

public static final String PROP_AROWBLOCK_SIZE

See Also:

Constant Field Values

Constructor Detail

QRFirstStep

public QRFirstStep(org.apache.hadoop.conf.Configuration jobConf,
                   org.apache.hadoop.mapred.OutputCollector<? super org.apache.hadoop.io.Writable,? super DenseBlockWritable> qtHatOut,
                   org.apache.hadoop.mapred.OutputCollector<? super org.apache.hadoop.io.Writable,? super VectorWritable> rHatOut)

Method Detail

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Throws:

IOException

getKP

public int getKP()

map

protected void map(Vector incomingYRow)
            throws IOException

Throws:

IOException

setup

protected void setup()

cleanup

protected void cleanup()
                throws IOException

Throws:

IOException

collect

public void collect(org.apache.hadoop.io.Writable key,
                    Vector vw)
             throws IOException

Specified by:

collect in interface org.apache.hadoop.mapred.OutputCollector<org.apache.hadoop.io.Writable,Vector>

Throws:

IOException