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https://issues.apache.org/jira/browse/MAHOUT-593?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dmitriy Lyubimov updated MAHOUT-593:
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Description:
Current Mahout-376 patch requries 'new' hadoop API. Certain elements of that
API (namely, multiple outputs) are not available in standard hadoop 0.20.2
release. As such, that may work only with either CDH or 0.21 distributions.
In order to bring it into sync with current Mahout dependencies, a backport of
the patch to 'old' API is needed.
Also, some work is needed to resolve math dependencies. Existing patch relies
on apache commons-math 2.1 for eigen decomposition of small matrices. This
dependency is not currently set up in the mahout core. So, certain snippets of
code are either required to go to mahout-math or use Colt eigen decompositon
(last time i tried, my results were mixed with that one. It seems to produce
results inconsistent with those from mahout-math eigensolver, at the very
least, it doesn't produce singular values in sorted order).
So this patch is mainly moing some Mahout-376 code around.
was:Current Mahout-376 patch requries 'new' hadoop API. In order to bring it
into sync with current Mahout dependencies, a backport of the patch to 'old'
API is needed.
> Backport of Stochastic SVD patch (Mahout-376) to hadoop 0.20 to ensure
> compatibility with current Mahout dependencies.
> ----------------------------------------------------------------------------------------------------------------------
>
> Key: MAHOUT-593
> URL: https://issues.apache.org/jira/browse/MAHOUT-593
> Project: Mahout
> Issue Type: New Feature
> Components: Math
> Affects Versions: 0.4
> Reporter: Dmitriy Lyubimov
> Fix For: 0.5
>
>
> Current Mahout-376 patch requries 'new' hadoop API. Certain elements of that
> API (namely, multiple outputs) are not available in standard hadoop 0.20.2
> release. As such, that may work only with either CDH or 0.21 distributions.
> In order to bring it into sync with current Mahout dependencies, a backport
> of the patch to 'old' API is needed.
> Also, some work is needed to resolve math dependencies. Existing patch relies
> on apache commons-math 2.1 for eigen decomposition of small matrices. This
> dependency is not currently set up in the mahout core. So, certain snippets
> of code are either required to go to mahout-math or use Colt eigen
> decompositon (last time i tried, my results were mixed with that one. It
> seems to produce results inconsistent with those from mahout-math
> eigensolver, at the very least, it doesn't produce singular values in sorted
> order).
> So this patch is mainly moing some Mahout-376 code around.
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