[jira] [Commented] (SPARK-5571) LDA should handle text as well

["Alok Singh (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-5571?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14605200#comment-14605200 ] 

Alok Singh commented on SPARK-5571:
-----------------------------------

Just wanted to get more clarification on this.
Does this jira , expect all the components i.e tokenizer -> stemmer -> stopword->runWithPrunedBagOfWords? or is it that we assume that  input is already tokenized, stemmed and stopword removed?



> LDA should handle text as well
> ------------------------------
>
>                 Key: SPARK-5571
>                 URL: https://issues.apache.org/jira/browse/SPARK-5571
>             Project: Spark
>          Issue Type: Improvement
>          Components: MLlib
>    Affects Versions: 1.3.0
>            Reporter: Joseph K. Bradley
>
> Latent Dirichlet Allocation (LDA) currently operates only on vectors of word counts.  It should also supporting training and prediction using text (Strings).
> This plan is sketched in the [original LDA design doc|https://docs.google.com/document/d/1kSsDqTeZMEB94Bs4GTd0mvdAmduvZSSkpoSfn-seAzo/edit?usp=sharing].
> There should be:
> * runWithText() method which takes an RDD with a collection of Strings (bags of words).  This will also index terms and compute a dictionary.
> * dictionary parameter for when LDA is run with word count vectors
> * prediction/feedback methods returning Strings (such as describeTopicsAsStrings, which is commented out in LDA currently)



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