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https://issues.apache.org/jira/browse/MAHOUT-1193?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13635447#comment-13635447
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Dmitriy Lyubimov commented on MAHOUT-1193:
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I think this is very useful.
I could use something like that for streaming QR solvers. Typically what
happens, there's a block of fixed height and width (usually dense or almost
dense) but it acts queue-like for rows (i.e. one can push one row from below
and remove one low from above).
The most efficient scheme that I used prevents object creation in that scenario
is that the memory that backs the pushed-out row can then be reused to push new
row from below. But I used just java 2d-array, i am sure there could be
something more clever and more general.
> 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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