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Posted to dev@mahout.apache.org by "Sean Owen (JIRA)" <ji...@apache.org> on 2011/05/21 05:06:48 UTC
[jira] [Resolved] (MAHOUT-625) Some of generated patterns have
support higher than in reality
[ https://issues.apache.org/jira/browse/MAHOUT-625?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Sean Owen resolved MAHOUT-625.
------------------------------
Resolution: Fixed
Fix Version/s: 0.5
Assignee: Robin Anil
(It looks like this was actually resolved in the past, and is in 0.5?)
> Some of generated patterns have support higher than in reality
> --------------------------------------------------------------
>
> Key: MAHOUT-625
> URL: https://issues.apache.org/jira/browse/MAHOUT-625
> Project: Mahout
> Issue Type: Bug
> Components: Frequent Itemset/Association Rule Mining
> Affects Versions: 0.4
> Reporter: Jaroslaw Odzga
> Assignee: Robin Anil
> Priority: Critical
> Fix For: 0.5
>
> Attachments: MAHOUT-625-patch.txt, bugfix-patch.txt, dataset_ok.txt, final_patch_with_bug_fix_test_and_the_dataset.txt, mahout-test.zip
>
>
> It turnes out that some of generated patterns have incorrect support. The returned support is slightly higher than the true one.
> I attached the test, which proves that FPGrowth has a bug. Test is using data (retail) found here: http://fimi.ua.ac.be/data/
> The pattern (36, 39, 41) occurs in the transactions 572 times (this is also calculated in test), but the FPGrowth returns pattern (36, 39, 41) with support 573.
> Please note that mentioned pattern is not the only one with incorrect support - the test only point out one example to hace something to focus on. There is plenty more patterns with support higher than the real one. The biggest difference I noticed was support 8 higher than the real one for one of patterns.
> Please find attached failing unit test - it's actually a maven project, which contains test data and is ready to run.
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