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https://issues.apache.org/jira/browse/MAHOUT-186?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12763145#action_12763145
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Robin Anil commented on MAHOUT-186:
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new List(priorityQueue) i believe doesnt keep the order of the priorityQueue as
the toArray and Iterator both returns data in random order. So you need to keep
polling the top of the heap isn't it?
> Classifier PriorityQueue returns erroneous results
> --------------------------------------------------
>
> Key: MAHOUT-186
> URL: https://issues.apache.org/jira/browse/MAHOUT-186
> Project: Mahout
> Issue Type: Bug
> Affects Versions: 0.1, 0.2
> Reporter: Robin Anil
> Assignee: Robin Anil
> Fix For: 0.2
>
> Attachments: MAHOUT-186.patch
>
>
> A simple test fails
> import org.apache.hadoop.util.PriorityQueue;
> PriorityQueue<ClassifierResult> queue = new ClassifierResultPriorityQueue(3);
> queue.insert(new ClassifierResult("label1", 5));
> queue.insert(new ClassifierResult("label2", 4));
> queue.insert(new ClassifierResult("label3", 3));
> queue.insert(new ClassifierResult("label4", 2));
> queue.insert(new ClassifierResult("label5", 1));
>
> assertEquals("Incorrect Size", 3, queue.size());
> log.info(queue.pop().toString());
> log.info(queue.pop().toString());
> log.info(queue.pop().toString());
> 09/10/07 16:58:39 INFO common.ClassifierResultPriorityQueueTest:
> ClassifierResult{category='label3', score=3.0}
> 09/10/07 16:58:39 INFO common.ClassifierResultPriorityQueueTest:
> ClassifierResult{category='label4', score=2.0}
> 09/10/07 16:58:39 INFO common.ClassifierResultPriorityQueueTest:
> ClassifierResult{category='label5', score=1.0}
> Expected label1 and label2 at the top
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