is there exist lda classifier with trained probabilistic model?

[jun li <ju...@gmail.com>]

Hi, all

I found in lingpipe book, there is a ldaclassifer  which just load trained
model and symbol table ( id mapping to word string) and classify new
document?

can lda in mahout providing the same function or command ?

thanks.


-- 
Li Jun

Re: is there exist lda classifier with trained probabilistic model?

[Jake Mannix <ja...@gmail.com>]

We don't currently have inference on unseen documents as part of the
mahout shell script, but there is a method you can use with very little
modification:

LDADriver.computeDocumentTopicProbabilities()

It will take in a SequenceFile with any kind of keys, and values which
are VectorWritable, as long as the data set used the same dictionary
file as the original training corpus, this should work just fine.  It will
spit out a SequenceFile with the same keys as the input, and
values being VectorWritables which give the p(topic|document) across
all topics.

On Fri, Jul 22, 2011 at 2:41 PM, Ted Dunning <te...@gmail.com> wrote:

> Not in the same form for LDA.
>
> You can definitely use LDA to build feature vectors and then classifier
> using those features using OnlineLogisticRegression.



>
> On Fri, Jul 22, 2011 at 12:56 AM, jun li <ju...@gmail.com> wrote:
>
> >
> > I found in lingpipe book, there is a ldaclassifer  which just load
> trained
> > model and symbol table ( id mapping to word string) and classify new
> > document?
> >
> > can lda in mahout providing the same function or command ?
> >
> > thanks.
> >
> >
> > --
> > Li Jun
> >
>

Re: is there exist lda classifier with trained probabilistic model?

[Ted Dunning <te...@gmail.com>]

Not in the same form for LDA.

You can definitely use LDA to build feature vectors and then classifier
using those features using OnlineLogisticRegression.

On Fri, Jul 22, 2011 at 12:56 AM, jun li <ju...@gmail.com> wrote:

>
> I found in lingpipe book, there is a ldaclassifer  which just load trained
> model and symbol table ( id mapping to word string) and classify new
> document?
>
> can lda in mahout providing the same function or command ?
>
> thanks.
>
>
> --
> Li Jun
>