Package generic.lsh.vector

Class LSHCosineVector

java.lang.Object

generic.lsh.vector.LSHCosineVector

All Implemented Interfaces:

LSHVector

Direct Known Subclasses:

LSHCosineVectorAccum

public class LSHCosineVector
extends Object
implements LSHVector

Constructor Summary

Constructors

Constructor	Description
LSHCosineVector()
LSHCosineVector(int[] feature, WeightFactory wfactory, IDFLookup idflookup)	Install a set of features as an int[].

Method Summary

Modifier and Type	Method	Description
long	calcUniqueHash()
double	compare(LSHVector op2, VectorCompare data)
void	compareCounts(LSHVector op2, VectorCompare data)
double	compareDetail(LSHVector op2, StringBuilder buf)
boolean	equals(Object obj)	Eclipse-generated equals method.
HashEntry[]	getEntries()
HashEntry	getEntry(int i)
double	getLength()
int	hashCode()	Uses the existing calcUniqueHash() method to determine hash value.
int	numEntries()
void	restoreBase64(Reader input, char[] buffer, WeightFactory wfactory, IDFLookup idflookup, int[] decode)
void	restoreSQL(String sql, WeightFactory wfactory, IDFLookup idflookup)
void	restoreXml(XmlPullParser parser, WeightFactory wfactory, IDFLookup idflookup)
void	saveBase64(StringBuilder buffer, char[] encoder)
String	saveSQL()
void	saveXml(Writer fwrite)
void	setHashEntries(HashEntry[] entries)	Install hashes and weights directly.

Methods inherited from class java.lang.Object

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

Constructor Details

LSHCosineVector

public LSHCosineVector()

LSHCosineVector

public LSHCosineVector(int[] feature,
 WeightFactory wfactory,
 IDFLookup idflookup)

Install a set of features as an int[]. Each integer is a hash. The integers MUST already be sorted. The same integer can occur more than once in the array (term frequency (TF) > 1). Weights are determined by TF and Inverse Document Frequency (IDF) of individual features

Parameters:

feature - is the sorted array of integer hashes

wfactory - is the container of weighting information

idflookup - is the container of IDF information

Method Details

hashCode

public int hashCode()

Uses the existing calcUniqueHash() method to determine hash value.

Overrides:

hashCode in class Object

Returns:

equals

public boolean equals(Object obj)

Eclipse-generated equals method. Only the hash attribute is necessary.

Overrides:

equals in class Object

Parameters:

obj -

Returns:

setHashEntries

public void setHashEntries(HashEntry[] entries)

Install hashes and weights directly. Length is automatically calculated. The entries must already be sorted on the hash

Parameters:

entries -

numEntries

public int numEntries()

Specified by:

numEntries in interface LSHVector

getEntry

public HashEntry getEntry(int i)

Specified by:

getEntry in interface LSHVector

getEntries

public HashEntry[] getEntries()

Specified by:

getEntries in interface LSHVector

compare

public double compare(LSHVector op2,
 VectorCompare data)

Specified by:

compare in interface LSHVector

compareCounts

public void compareCounts(LSHVector op2,
 VectorCompare data)

Specified by:

compareCounts in interface LSHVector

compareDetail

public double compareDetail(LSHVector op2,
 StringBuilder buf)

Specified by:

compareDetail in interface LSHVector

getLength

public double getLength()

Specified by:

getLength in interface LSHVector

restoreXml

public void restoreXml(XmlPullParser parser,
 WeightFactory wfactory,
 IDFLookup idflookup)

Specified by:

restoreXml in interface LSHVector

restoreSQL

public void restoreSQL(String sql,
 WeightFactory wfactory,
 IDFLookup idflookup)
                throws IOException

Specified by:

restoreSQL in interface LSHVector

Throws:

IOException

restoreBase64

public void restoreBase64(Reader input,
 char[] buffer,
 WeightFactory wfactory,
 IDFLookup idflookup,
 int[] decode)
                   throws IOException

Specified by:

restoreBase64 in interface LSHVector

Throws:

IOException

saveXml

public void saveXml(Writer fwrite)
             throws IOException

Specified by:

saveXml in interface LSHVector

Throws:

IOException

saveSQL

public String saveSQL()

Specified by:

saveSQL in interface LSHVector

saveBase64

public void saveBase64(StringBuilder buffer,
 char[] encoder)

Specified by:

saveBase64 in interface LSHVector

calcUniqueHash

public long calcUniqueHash()

Specified by:

calcUniqueHash in interface LSHVector