Dan Filimon created MAHOUT-1180:
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Summary: Multinomial<T> throws ConcurrentModificationException
when iterating and setting probabilities
Key: MAHOUT-1180
URL: https://issues.apache.org/jira/browse/MAHOUT-1180
Project: Mahout
Issue Type: Bug
Affects Versions: 0.8
Reporter: Dan Filimon
Priority: Minor
Here's [1] an example of the problem (from BallKMeans, lines 225-232, [2]).
When iterating through the elements in a Multinomial and updating the
probabilities, sometimes newWeight becomes 0 (because of using CosineDistances).
When setting a weight to 0 in Multinomial, the element is removed from the
items hash map while using the hash map for iteration.
This causes a ConcurrentModificationException.
[1] https://gist.github.com/dfilimon/5270234
[2]
https://github.com/dfilimon/mahout/blob/skm/core/src/main/java/org/apache/mahout/clustering/streaming/cluster/BallKMeans.java#L225
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