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https://issues.apache.org/jira/browse/SOLR-651?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12642157#action_12642157
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Grant Ingersoll commented on SOLR-651:
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{quote}
If the user has asked for tf=true&idf=true user implies give me both computation
so the output would be
<float name="display">1.0</float>
{quote}
Ah, so you are expecting Solr to do the computation tf*idf when you specify 
those two options, right?  My interpretations (and implmentation) is that it 
means return those two values in the response.  See 
http://wiki.apache.org/solr/TermVectorComponentExampleOptions

I suppose we could add something like &tf-idf=true in which case Solr does the 
computation.  Otherwise, I think it is useful to be able to deliver them 
separately, as I think it gives the most flexibility.  Would adding a tf-idf 
option suit your needs?  Such that, when it is true, Solr returns that 
computation?

> A SearchComponent for fetching TF-IDF values
> --------------------------------------------
>
>                 Key: SOLR-651
>                 URL: https://issues.apache.org/jira/browse/SOLR-651
>             Project: Solr
>          Issue Type: New Feature
>    Affects Versions: 1.3
>            Reporter: Noble Paul
>            Assignee: Grant Ingersoll
>            Priority: Minor
>             Fix For: 1.4
>
>         Attachments: SOLR-651.patch, SOLR-651.patch, SOLR-651.patch, 
> SOLR-651.patch, SOLR-651.patch
>
>
> A SearchComponent that can return TF-IDF vector for any given document in the 
> SOLR index
> Query : A Document Number / a query identifying a Document
> Response :  A Map of term vs.TF-IDF value of every term in the Selected
> Document
> Why ?
> Most of the Machine Learning Algorithms work on TFIDF representation of
> documents, hence adding a Request Handler proving the TFIDF representation
> will pave the way for incorporating Learning Paradigms to SOLR framework.

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