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https://issues.apache.org/jira/browse/MAHOUT-596?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen updated MAHOUT-596:
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Fix Version/s: 0.6
Assignee: Jeff Eastman
Yuval I'm reviewing old issues here: do you have a suggested patch, or more
elaboration on what should be changed here?
> Testing if the weight assigned to points when calling the observe method in
> AbstractCluster incorrectly affect the number of points in a cluster
> -------------------------------------------------------------------------------------------------------------------------------------------------
>
> 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
> Assignee: Jeff Eastman
> Priority: Minor
> Fix For: 0.6
>
> Attachments: TestAbstractCluster.java
>
>
> 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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