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Posted to dev@mahout.apache.org by "Paul Baclace (JIRA)" <ji...@apache.org> on 2011/05/11 01:39:48 UTC
[jira] [Created] (MAHOUT-692) OnlineSummarizer does not tolerate
fewer than 100 samples
OnlineSummarizer does not tolerate fewer than 100 samples
---------------------------------------------------------
Key: MAHOUT-692
URL: https://issues.apache.org/jira/browse/MAHOUT-692
Project: Mahout
Issue Type: Bug
Affects Versions: 0.4
Reporter: Paul Baclace
Priority: Minor
If fewer than 100 samples are add()ed to an instance of org.apache.mahout.math.stats.OnlineSummarizer an exception will be thrown during a sort when getQuartile() is called:
Caused by: java.lang.IndexOutOfBoundsException: from: 0, to: 99, size=89
at org.apache.mahout.math.list.AbstractList.checkRangeFromTo(AbstractList.java:87)
at org.apache.mahout.math.list.DoubleArrayList.sortFromTo(DoubleArrayList.java:573)
at org.apache.mahout.math.stats.OnlineSummarizer.sort(OnlineSummarizer.java:116)
at org.apache.mahout.math.stats.OnlineSummarizer.getQuartile(OnlineSummarizer.java:129)
The problem is that sort is on index range 0,99 but 0,n-1 should be used.
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[jira] [Resolved] (MAHOUT-692) OnlineSummarizer does not tolerate
fewer than 100 samples
Posted by "Sean Owen (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MAHOUT-692?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Sean Owen resolved MAHOUT-692.
------------------------------
Resolution: Fixed
Assignee: Ted Dunning
Looks like a very simple fix, to sort the whole "starter" array rather than sort potentially off the end. While I don't know the logic 100% I understand it enough at first glance to not see an obvious reason that would be wrong.
> OnlineSummarizer does not tolerate fewer than 100 samples
> ---------------------------------------------------------
>
> Key: MAHOUT-692
> URL: https://issues.apache.org/jira/browse/MAHOUT-692
> Project: Mahout
> Issue Type: Bug
> Affects Versions: 0.4
> Reporter: Paul Baclace
> Assignee: Ted Dunning
> Priority: Minor
> Fix For: 0.6
>
>
> If fewer than 100 samples are add()ed to an instance of org.apache.mahout.math.stats.OnlineSummarizer an exception will be thrown during a sort when getQuartile() is called:
> Caused by: java.lang.IndexOutOfBoundsException: from: 0, to: 99, size=89
> at org.apache.mahout.math.list.AbstractList.checkRangeFromTo(AbstractList.java:87)
> at org.apache.mahout.math.list.DoubleArrayList.sortFromTo(DoubleArrayList.java:573)
> at org.apache.mahout.math.stats.OnlineSummarizer.sort(OnlineSummarizer.java:116)
> at org.apache.mahout.math.stats.OnlineSummarizer.getQuartile(OnlineSummarizer.java:129)
> The problem is that sort is on index range 0,99 but 0,n-1 should be used.
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[jira] [Commented] (MAHOUT-692) OnlineSummarizer does not tolerate
fewer than 100 samples
Posted by "Ted Dunning (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MAHOUT-692?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13031553#comment-13031553 ]
Ted Dunning commented on MAHOUT-692:
------------------------------------
Harumph. this bug looks familiar.
Let me look to see if I have a fix on a dev branch.
> OnlineSummarizer does not tolerate fewer than 100 samples
> ---------------------------------------------------------
>
> Key: MAHOUT-692
> URL: https://issues.apache.org/jira/browse/MAHOUT-692
> Project: Mahout
> Issue Type: Bug
> Affects Versions: 0.4
> Reporter: Paul Baclace
> Priority: Minor
>
> If fewer than 100 samples are add()ed to an instance of org.apache.mahout.math.stats.OnlineSummarizer an exception will be thrown during a sort when getQuartile() is called:
> Caused by: java.lang.IndexOutOfBoundsException: from: 0, to: 99, size=89
> at org.apache.mahout.math.list.AbstractList.checkRangeFromTo(AbstractList.java:87)
> at org.apache.mahout.math.list.DoubleArrayList.sortFromTo(DoubleArrayList.java:573)
> at org.apache.mahout.math.stats.OnlineSummarizer.sort(OnlineSummarizer.java:116)
> at org.apache.mahout.math.stats.OnlineSummarizer.getQuartile(OnlineSummarizer.java:129)
> The problem is that sort is on index range 0,99 but 0,n-1 should be used.
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[jira] [Updated] (MAHOUT-692) OnlineSummarizer does not tolerate
fewer than 100 samples
Posted by "Ted Dunning (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MAHOUT-692?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Ted Dunning updated MAHOUT-692:
-------------------------------
Fix Version/s: 0.6
This definitely needs fixing.
> OnlineSummarizer does not tolerate fewer than 100 samples
> ---------------------------------------------------------
>
> Key: MAHOUT-692
> URL: https://issues.apache.org/jira/browse/MAHOUT-692
> Project: Mahout
> Issue Type: Bug
> Affects Versions: 0.4
> Reporter: Paul Baclace
> Priority: Minor
> Fix For: 0.6
>
>
> If fewer than 100 samples are add()ed to an instance of org.apache.mahout.math.stats.OnlineSummarizer an exception will be thrown during a sort when getQuartile() is called:
> Caused by: java.lang.IndexOutOfBoundsException: from: 0, to: 99, size=89
> at org.apache.mahout.math.list.AbstractList.checkRangeFromTo(AbstractList.java:87)
> at org.apache.mahout.math.list.DoubleArrayList.sortFromTo(DoubleArrayList.java:573)
> at org.apache.mahout.math.stats.OnlineSummarizer.sort(OnlineSummarizer.java:116)
> at org.apache.mahout.math.stats.OnlineSummarizer.getQuartile(OnlineSummarizer.java:129)
> The problem is that sort is on index range 0,99 but 0,n-1 should be used.
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