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From "Dan Filimon (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAHOUT-1180) Multinomial<T> throws ConcurrentModificationException when iterating and setting probabilities
Date Fri, 29 Mar 2013 11:21:14 GMT
Dan Filimon created MAHOUT-1180:
-----------------------------------

             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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