org.apache.mahout.common.distance
Interfaces 
DistanceMeasure
Classes 
CosineDistanceMeasure
EuclideanDistanceMeasure
ManhattanDistanceMeasure
SquaredEuclideanDistanceMeasure
TanimotoDistanceMeasure
WeightedDistanceMeasure
WeightedEuclideanDistanceMeasure
WeightedManhattanDistanceMeasure