After not much activity - took a brief look at the patch. Some comments (to be taken with a grain of salt after I didn't have the cycles to follow the project as closely as I would have liked in the past months):
You mentioned a forked git repo on github - is it still online?
So far looks like a rather isolated change. Would it make sense to integrate it with existing classification APIs e.g. org.apache.mahout.classifier.AbstractVectorClassifier?
Also some more documentation and a usage example for the un-initiated would be great: In addition to links to one or two publications the implementation is based on it's always great to have some information on the strengths and weaknesses of the implemented solution (yes, I know we are doing pretty badly along these lines with other bits and pieces we have - still would be nice to have).