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From "Grant Ingersoll (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAHOUT-65) Add Element Labels to Vectors and Matrices
Date Wed, 17 Jun 2009 19:20:07 GMT

    [ https://issues.apache.org/jira/browse/MAHOUT-65?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12720838#action_12720838
] 

Grant Ingersoll commented on MAHOUT-65:
---------------------------------------

bq. The canopy clustering example has been broken by the changes to the internal representation
of Vector. The problem is that Canopy, Cluster and the example OutputMapper all rely on string
concatenation. Judging by the code, the string parsing work looks inefficient and has proved
fragile. (Personally speaking, I also find it hard to understand the code when the wire format
and object designs are quite different.)

Sounds like we need some better tests that prevent this from happening, too.  FWIW,, I like
the JSON for external representation, but I admit you guys know more about this than me.

> 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
>    Affects Versions: 0.1
>            Reporter: Jeff Eastman
>            Assignee: Jeff Eastman
>         Attachments: MAHOUT-65-name.patch, MAHOUT-65-name.patch, MAHOUT-65-name.patch,
MAHOUT-65.patch, MAHOUT-65b.patch, MAHOUT-65c.patch, MAHOUT-65d.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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