Unable to find KMeans Cluster class

[Abhinav M Kulkarni]

Hi,

I have following code snippet from the book 'Hadoop in Action':
Vector vec = vectors.get(i);
Cluster cluster = new Cluster(vec, i, new EuclideanDistanceMeasure());

I am unable to find Cluster class anywhere with constructor as above. In 
fact under package
org.apache.mahout.clustering Cluster is defined as an interface and not 
as a class.

Is there any version mismatch or something? Or I need to import Cluster 
class from some other package that I am not aware of?

Thanks,
Abhinav M Kulkarni