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https://issues.apache.org/jira/browse/MAHOUT-65?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jeff Eastman updated MAHOUT-65:
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Attachment: MAHOUT-65.patch
This patch introduces four new operations on Vectors:
1. setLabelBindings(Map<String, Integer> bindings) - sets a map of bindings
between string labels and vector index values
2. getLabelBindings() - returns the map, creating an empty one if needed
3. set(String label, double value) throws UnboundLabelException, IndexException
- sets the labeled element of the vector to the given value
4. get(String label) throws UnboundLabelException, IndexException - returns the
value indexed by the given label
This patch required reworking of the serializing/deserializing code so that the
maps are included in the formatted value if present. Added some new unit tests
to verify it all works. All tests still run.
This is about as minimal a change as I could imagine, and I chose to just
expose the map rather than try to encapsulate all the operations that clients
might want to perform on it. Is this the kind of functionality that people will
find useful?
Jeff
> 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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