[jira] Created: (MAHOUT-596) Testing if the weight assigned to points when calling the observe method in AbstractCluster incorrectly affect the number of points in a cluster

[Yuval Merhav (JIRA)]

Testing if the weight assigned to points when calling the observe method in 
AbstractCluster incorrectly affect the number of points in a cluster 
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                 Key: MAHOUT-596
                 URL: https://issues.apache.org/jira/browse/MAHOUT-596
             Project: Mahout
          Issue Type: Test
          Components: Clustering
    Affects Versions: 0.5
            Reporter: Yuval Merhav
            Priority: Minor


See the observe method in AbstractCluster:

public void observe(Vector x, double weight) {
    s0 += weight;
    Vector weightedX = x.times(weight);
 ....
  }

And then the computeParameters method:
 
public void computeParameters() {
    ...
 numPoints = (int) s0;
    ...
}

So if someone changes the weight from the default value 1.0, it affects the 
number of points in the cluster. It does not
however affect the centroid (which I'm not sure if that's correct or not -- 
depends on what the author meant to use the weight for).

I attached a few simple test cases that fail. 


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