Truncation issue in KMeansPlusPlusClusterer
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Key: MATH-546
URL: https://issues.apache.org/jira/browse/MATH-546
Project: Commons Math
Issue Type: Bug
Affects Versions: 3.0
Reporter: Nate Paymer
Priority: Minor
The for loop inside KMeansPlusPlusClusterer.chooseInitialClusters defines a
variable
int sum = 0;
This variable should have type double, rather than int. Using an int causes
the method to truncate the distances between points to (square roots of)
integers. It's especially bad when the distances between points are typically
less than 1.
As an aside, in version 2.2, this bug manifested itself by making the clusterer
return empty clusters. I wonder if the EmptyClusterStrategy would still be
necessary if this bug were fixed.
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