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https://issues.apache.org/jira/browse/MAHOUT-206?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Grant Ingersoll reassigned MAHOUT-206:
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Assignee: Grant Ingersoll
> Separate and clearly label different SparseVector implementations
> -----------------------------------------------------------------
>
> Key: MAHOUT-206
> URL: https://issues.apache.org/jira/browse/MAHOUT-206
> Project: Mahout
> Issue Type: Improvement
> Components: Matrix
> Affects Versions: 0.2
> Environment: all
> Reporter: Jake Mannix
> Assignee: Grant Ingersoll
> Fix For: 0.3
>
> Attachments: MAHOUT-206.patch
>
>
> Shashi's last patch on MAHOUT-165 swapped out the int/double parallel array
> impl of SparseVector for an OpenIntDoubleMap (hash-based) one. We actually
> need both, as I think I've mentioned a gazillion times.
> There was a patch, long ago, on MAHOUT-165, in which Ted had
> OrderedIntDoubleVector, and OpenIntDoubleHashVector (or something to that
> effect), and neither of them are called SparseVector. I like this, because
> it forces people to choose what kind of SparseVector they want (and they
> should: sparse is an optimization, and the client should make a conscious
> decision what they're optimizing for).
> We could call them RandomAccessSparseVector and SequentialAccessSparseVector,
> to be really obvious.
> But really, the important part is we have both.
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