Bug#805395: predict.gbm() using single.tree=TRUE does not return the correct predictions with multinomial distribution

[Andreas Tille]

Hello Harry,

On Tue, Mar 27, 2018 at 02:41:28PM +0100, Harry Southworth wrote:
> That post is about 2.5 years old and the version of gbm is 2.1.1.

That's correct.  The original maintainer seems to have lost interest and
I'm now trying to polish the list of bugs in any R package in Debian.

> The version on CRAN is now 2.1.3 but has status ORPHANED.

Thats the currently packaged version of gbm in Debian but I have no
sign that the issue has changed (bug reporter is in CC).
 
> Since then, gbm maintenance got moved around a couple more times. You
> can find it's current page here:
> https://github.com/gbm-developers
> 
> To address, the question: I don't understand it.

Puh, that's relaxing for me since I do not understanding it as well. ;-)

> However, I do recall
> that there were a number of known bugs in the multinomial
> functionality and that that functionality was dropped from gbm3 (a
> newer version, rewritten from the ground up, but whose development
> appears to have stalled).
> 
> I've posted in GitHub, but don't know how likely it is that you'll get
> a helpful response.

That's a very helpful response.  I subscribed issue #21 and will wait
for a better answer.
 
> Sorry not to be more helpful,

Thanks a lot for the quick response

      Andreas.

Control: forwarded -1 https://github.com/gbm-developers/gbm/issues/21
 
> On 27 March 2018 at 13:27, Andreas Tille <andreas at an3as.eu> wrote:
> > Hello Harry,
> >
> > the R packaging team is maintaining gbm in Debian.  A user has filed a
> > bug report against version 2.1.1 which I would like to bring to your
> > attention.  Please have a look here where the problem is explicitly
> > described:
> >
> >     https://bugs.debian.org/805395
> >
> > Could you please comment on this?  I admit I do not fully understand
> > what exactly is incorrect here and what to expect.  May be some test
> > case would help to confirm the integrity of the code.
> >
> > Kind regards
> >
> >        Andreas.
> >
> >
> > Control: tags -1 help
> > Control: forwarded -1 Harry Southworth <harry.southworth at gmail.com>
> >
> >
> > --
> > http://fam-tille.de
> 

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