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Posted to dev@mahout.apache.org by "Paritosh Ranjan (JIRA)" <ji...@apache.org> on 2012/10/09 08:08:02 UTC

[jira] [Commented] (MAHOUT-1091) Bug in SequentialAccessSparseVector full iteration

    [ https://issues.apache.org/jira/browse/MAHOUT-1091?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13472167#comment-13472167 ] 

Paritosh Ranjan commented on MAHOUT-1091:
-----------------------------------------

The patch I submitted would fail if there are 0 non-zero elements. Still, it was interesting to look into it.
                
> Bug in SequentialAccessSparseVector full iteration
> --------------------------------------------------
>
>                 Key: MAHOUT-1091
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1091
>             Project: Mahout
>          Issue Type: Bug
>          Components: Math
>            Reporter: Ted Dunning
>             Fix For: 0.8
>
>         Attachments: 0001-MAHOUT-1091-Add-test-to-demonstrate-broken-iterator-.patch, 0001-MAHOUT-1091-Add-test-to-demonstrate-broken-iterator-.patch, MAHOUT-1091.patch
>
>
> The iterator for the SequentialAccessSparseVector doesn't return any items beyond the last non-zero.  This breaks some stuff pretty massively, but hopefully doesn't break much user code since iterating through all elements of a sparse vector is a relatively rare thing to do.

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