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From "Karl Wettin (JIRA)" <>
Subject [jira] Commented: (MAHOUT-61) Text problem matrix builder
Date Sat, 21 Jun 2008 15:02:45 GMT


Karl Wettin commented on MAHOUT-61:

It just hit me that this should of course be an MR-job. I suppose it would have to be divided
in two runs, one string feature extraction run and one string feature to matrix column index
run. Or?

> Text problem matrix builder 
> ----------------------------
>                 Key: MAHOUT-61
>                 URL:
>             Project: Mahout
>          Issue Type: New Feature
>            Reporter: Karl Wettin
>            Assignee: Karl Wettin
>            Priority: Minor
>         Attachments: MAHOUT-61.txt
> A set of classes that builds matrices from text.
> Currently the API consists of TokenMatrixBuilder and TokenInstanceBuilder. Should be
thread safe.
> PostReader imports 20news-bydate. This takes several GB heap. It would be nice to bounce
the data via JDBM or perhaps using the PersistentHashMap in MAHOUT-19.

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