[jira] Commented: (MAHOUT-61) Text problem matrix builder

["Karl Wettin (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAHOUT-61?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12606947#action_12606947 ] 

Karl Wettin commented on MAHOUT-61:
-----------------------------------

Tokenization is currently more of a classification problem than a clusterer problem solver. I wanted to add shingles but could not find the class in the lucene dists? Not even in a snapshot.

So far this code just creates a matrix. I needs to be written to file so it can be read by the algorithms that wants to use it. I have not really tested this, it is an early beta just to get some feedback.

> Text problem matrix builder 
> ----------------------------
>
>                 Key: MAHOUT-61
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-61
>             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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