org.apache.mahout.math.hadoop.similarity.cooccurrence.measures

Interface VectorSimilarityMeasure

All Known Implementing Classes:

CityBlockSimilarity, CooccurrenceCountSimilarity, CosineSimilarity, CountbasedMeasure, EuclideanDistanceSimilarity, LoglikelihoodSimilarity, PearsonCorrelationSimilarity, TanimotoCoefficientSimilarity

public interface VectorSimilarityMeasure

Field Summary

Fields

Modifier and Type	Field and Description
static double	NO_NORM

Method Summary

Modifier and Type	Method and Description
double	aggregate(double nonZeroValueA, double nonZeroValueB)
boolean	consider(int numNonZeroEntriesA, int numNonZeroEntriesB, double maxValueA, double maxValueB, double threshold)
double	norm(Vector vector)
Vector	normalize(Vector vector)
double	similarity(double summedAggregations, double normA, double normB, int numberOfColumns)

Field Detail

NO_NORM

static final double NO_NORM

See Also:

Constant Field Values

Method Detail

normalize

Vector normalize(Vector vector)

norm

double norm(Vector vector)

aggregate

double aggregate(double nonZeroValueA,
                 double nonZeroValueB)

similarity

double similarity(double summedAggregations,
                  double normA,
                  double normB,
                  int numberOfColumns)

consider

boolean consider(int numNonZeroEntriesA,
                 int numNonZeroEntriesB,
                 double maxValueA,
                 double maxValueB,
                 double threshold)