[jira] [Resolved] (MAHOUT-1598) extend seq2sparse to handle multiple text blocks of same document

["Andrew Musselman (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAHOUT-1598?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrew Musselman resolved MAHOUT-1598.
--------------------------------------
    Resolution: Fixed

Fixed by PR #34.

> extend seq2sparse to handle multiple text blocks of same document
> -----------------------------------------------------------------
>
>                 Key: MAHOUT-1598
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1598
>             Project: Mahout
>          Issue Type: Improvement
>    Affects Versions: 0.9
>            Reporter: Wolfgang Buchner
>            Assignee: Andrew Musselman
>              Labels: legacy
>             Fix For: 0.10.0
>
>
> Currently the seq2sparse or in particular the org.apache.mahout.vectorizer.DictionaryVectorizer needs as input exactly one text block per document.
> I stumbled on this because i'm having an use case where one document represents a ticket which can have several text blocks in different languages. 
> So my idea was that the org.apache.mahout.vectorizer.DocumentProcessor shall tokenize each text block itself. So i can use language specific features in our Lucene Analyzer.
> Unfortunately the current implementation doesn't support this.
> But with just minor changes this can be made possible.
> The only thing which has to be changed would be the org.apache.mahout.vectorizer.term.TFPartialVectorReducer to handle all values of the iterable (not just the 1st one >.<)
> An Alternative would be to change this Reducer to a Mapper, i don't get why in the 1st place this is implemented as an reducer. Is there any benefit from this?
> I will provide a PR via github.
> Please have a look onto this and tell me if i am assuming anything wrong.



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