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https://issues.apache.org/jira/browse/MAHOUT-1193?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13642752#comment-13642752
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Gokhan Capan commented on MAHOUT-1193:
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Sorry I missed that.
I modified the SparseMatrix code to handle dense rows and I am happy with that.
The code is not patch-quality, but I can implement a flexible extension to the
current implementation if that is desired (I believe that might be a common use
case).
I personally liked the BlockSparseMatrix idea and its really flexible schema. I
did a quick implementation to make it work with configurable block size, in a
few days I can submit an additional diff to the reviewboard so we can discuss
on code. One thing to consider, I suspect my version's CPU usage is kind of
high.
I believe both versions are valuable and important, they have their own
benefits, particularly as an input to online learning algorithms.
> We may want a BlockSparseMatrix
> -------------------------------
>
> Key: MAHOUT-1193
> URL: https://issues.apache.org/jira/browse/MAHOUT-1193
> Project: Mahout
> Issue Type: Bug
> Reporter: Ted Dunning
> Attachments: MAHOUT-1193.patch
>
>
> Here is an implementation.
> Is it good enough to commit?
> Is it useful?
> Is it redundant?
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