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https://issues.apache.org/jira/browse/HAMA-941?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15265326#comment-15265326
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Behroz Sikander commented on HAMA-941:
--------------------------------------
In the past few days, I went through the material on semi-clustering. I have
developed basic understanding of the algorithm but there is no real example
implementation available online.
Then I studied the code of semi-clustering implemented in Hama. I do not think
that semi-clustering algorithm is working properly. The score of a semi-cluster
remains 1.0 and it never changes (this 1.0 value is defined in the constructor
of SemiClusterDetails class). Further, the most strange thing is that the code
(semiClusterScoreCalcuation) to actually calculate the Score never fires !.
In the "compute" event of "SemiClusteringVertex" class, the following condition
is never satisfied and since the condition is never satisfied, the score is
never calculated.
if (!msg.contains(this.getVertexID())
&& msg.size() == semiClusterMaximumVertexCount) {
.....
msgNew.setScore(semiClusterScoreCalcuation(msgNew));
.....
}
How should we proceed ? I can look into the Giraph implementation of
Semi-Clustering and can try to find out what is the problem with
semi-clustering.
(https://github.com/grafos-ml/okapi/blob/master/src/main/java/ml/grafos/okapi/graphs/SemiClustering.java)
> Semiclustering Termination
> --------------------------
>
> Key: HAMA-941
> URL: https://issues.apache.org/jira/browse/HAMA-941
> Project: Hama
> Issue Type: Improvement
> Components: examples, graph
> Reporter: Edward J. Yoon
> Priority: Minor
>
> Currently Semiclustering example will be terminated when the number of
> iterations exceeded the predefined threshold max iteration.
> App should be stopped if there's no cluster changes (I guess). Please check
> and improve it.
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