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https://issues.apache.org/jira/browse/MAHOUT-518?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12917268#action_12917268
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Ted Dunning commented on MAHOUT-518:
------------------------------------

Java Advanced Imaging can read PNM formatted images with includes PGM (and PBM 
and PPM) formatted images.

See 
http://java.sun.com/products/java-media/jai/iio.html
and
http://java.sun.com/javase/technologies/desktop/media/jai/project/index.html
and
https://jai-imageio.dev.java.net/

Sanselan also supports reading images in PGM format.  

I don't know how much we want to add a dependency just for a demo program for 
eigenCuts.


> Implement Affinity Preprocessing for Eigencuts and Spectral KMeans
> ------------------------------------------------------------------
>
>                 Key: MAHOUT-518
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-518
>             Project: Mahout
>          Issue Type: Improvement
>          Components: Clustering
>    Affects Versions: 0.4
>            Reporter: Jeff Eastman
>             Fix For: 0.5
>
>
> The input format for these clustering algorithms is currently affinity 
> tuples. It would be very nice to have this process automated. Marking for 0.5 
> as this will require some investigation.

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