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Posted to dev@mahout.apache.org by "Suneel Marthi (JIRA)" <ji...@apache.org> on 2013/07/25 14:33:48 UTC
[jira] [Updated] (MAHOUT-1130) Wrong logic in
org.apache.mahout.clustering.kmeans.RandomSeedGenerator
[ https://issues.apache.org/jira/browse/MAHOUT-1130?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Suneel Marthi updated MAHOUT-1130:
----------------------------------
Affects Version/s: 0.7
Fix Version/s: 0.8
> Wrong logic in org.apache.mahout.clustering.kmeans.RandomSeedGenerator
> ----------------------------------------------------------------------
>
> Key: MAHOUT-1130
> URL: https://issues.apache.org/jira/browse/MAHOUT-1130
> Project: Mahout
> Issue Type: Bug
> Affects Versions: 0.7
> Environment: mahout 0.7 from maven central
> Reporter: Andrey Davydov
> Assignee: Sebastian Schelter
> Fix For: 0.8
>
> Attachments: MAHOUT-1130.patch
>
>
> There is following code in line 101:
> } else if (random.nextInt(currentSize + 1) != 0) { // with chance 1/(currentSize+1) pick new element
> but it actually means pick new element with chance currentSize/(currentSize+1)
> so generator takes initial centers from the end of source data file.
> It seems that chance of replace vector in output set should decrease with number of processed input vectors
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