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https://issues.apache.org/jira/browse/MAHOUT-638?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13012230#comment-13012230
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Dmitriy Lyubimov edited comment on MAHOUT-638 at 3/28/11 9:23 PM:
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bq. I would drop most of the properties that specify versions. Defining a
symbol that is used in one place doesn't really even save much.
I take it this is MAHOUT-622 comment?
was (Author: dlyubimov):
.bq I would drop most of the properties that specify versions. Defining a
symbol that is used in one place doesn't really even save much.
I take it this is MAHOUT-622 comment?
> Stochastic svd's is not handling well all cases of sparse vectors
> ------------------------------------------------------------------
>
> Key: MAHOUT-638
> URL: https://issues.apache.org/jira/browse/MAHOUT-638
> Project: Mahout
> Issue Type: Bug
> Components: Math
> Affects Versions: 0.5
> Reporter: Dmitriy Lyubimov
> Assignee: Dmitriy Lyubimov
> Fix For: 0.5
>
> Attachments: MAHOUT-638.patch
>
>
> The Mahout patch of the algorithm is not handling all types of sparse input
> efficiently. BtJob doesn't handle SequentialSparseVector in a way to pick
> only non-zero elements from initial input and QJob doesn't iterate over
> RandomAccessSparseVector correctly. With extremely sparse inputs (0.05%
> non-zero elements) that leads to a terrible inefficiency in the
> aforementioned jobs (QJob, BtJob).
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