de.jungblut.distance

Class VectorDocumentDistanceMeasurer<T>

java.lang.Object

de.jungblut.distance.VectorDocumentDistanceMeasurer<T>

Type Parameters:

T - the possible key type. On sparse vectors where inverted indices are used, this is the dimension where the value not equals 0.

All Implemented Interfaces:

InvertedIndex.DocumentDistanceMeasurer<de.jungblut.math.DoubleVector,T>

public final class VectorDocumentDistanceMeasurer<T>
extends Object
implements InvertedIndex.DocumentDistanceMeasurer<de.jungblut.math.DoubleVector,T>

Document distance measurer on vectors (basically a proxy to the real DistanceMeasurer).

Author:

thomas.jungblut

Method Summary

Modifier and Type	Method and Description
double	measure(de.jungblut.math.DoubleVector reference, Set<T> referenceKeys, de.jungblut.math.DoubleVector doc, Set<T> docKeys) Measures the distance (value between 0.0 and 1.0) between a reference document and a candidate document.
static <T> VectorDocumentDistanceMeasurer<T>	with(DistanceMeasurer measurer)

Methods inherited from class java.lang.Object

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

Method Detail

measure

public double measure(de.jungblut.math.DoubleVector reference,
                      Set<T> referenceKeys,
                      de.jungblut.math.DoubleVector doc,
                      Set<T> docKeys)

Description copied from interface: InvertedIndex.DocumentDistanceMeasurer

Measures the distance (value between 0.0 and 1.0) between a reference document and a candidate document.

Specified by:

measure in interface InvertedIndex.DocumentDistanceMeasurer<de.jungblut.math.DoubleVector,T>

Parameters:

reference - the reference document.

referenceKeys - the reference document key parts.

doc - the candidate document.

docKeys - the candidate document key parts.

Returns:

a value between 0d and 1d where 0d is most similar.

with

public static <T> VectorDocumentDistanceMeasurer<T> with(DistanceMeasurer measurer)

Returns:

a new vector document similarity measurer by a distance measure.