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https://issues.apache.org/jira/browse/MAHOUT-65?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12615869#action_12615869
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Jeff Eastman commented on MAHOUT-65:
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Whether or not we decide to split this issue or just rename it, the semantics
of "associate arbitrary metadata with" are a significant generalization of the
original "use labels to access". As a minimalist, my only concern is that we
have real, testable user stories that support such a generalization else we
risk premature abstraction complications down the road. In particular, do we
have a concrete ML algorithm under development for Mahout that requires this
capability or are we just imagining that we might encounter one down the road?
If we do have such user stories then it would be instructive to describe them
here. I'm not sure that the "use labels to access" feature even passes this
test, though I think the bar is lower. Finally, I think a wrapper
implementation would be just fine.
> Add Element Labels to Vectors and Matrices
> ------------------------------------------
>
> Key: MAHOUT-65
> URL: https://issues.apache.org/jira/browse/MAHOUT-65
> Project: Mahout
> Issue Type: New Feature
> Components: Matrix
> Reporter: Jeff Eastman
> Attachments: MAHOUT-65.patch
>
>
> Many applications can benefit by accessing elements in vectors and matrices
> using String labels in addition to numeric indices. Investigate adding such a
> capability.
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