[mlpack] MVU Bug Fix GSOC

[Ryan Curtin]

On Wed, Apr 04, 2018 at 10:01:11AM +0000, LI Xuran wrote:
> Hey Ryan,
>
> Sorry for the ambiguity. Basically what  I did was just a shortlist of
> the major past topics related to LRSDP on Github. I didn't realise
> that the sparse and dense constraint is already implemented, which is
> great.
>
> By "detail constraints" I basically want to say is that it would be
> helpful to have some dataset that is guaranteed to not have any saddle
> point, i.e. having only local and global minima so that we can check
> the convergence of the LRSDP on problems not involving saddle point.
> Maybe it shouldn't be implemented as  a constraint but just as
> something to keep in mind during the generation of the data.
>
> since sparse and dense constraints have already been implemented in
> MUV SDP then yeah I think a variadic template wouldn't be quite of
> help in this case. I haven't give much thought to this over the past
> few days as I was caught up with coursework and hackathon, but I will
> look further into the code base and give a detailed suggestion on
> whether it is possible to further constraint the question or pass on
> some useful information to the SDP class this week.

Hi Daniel,

I hope the hackathon was enjoyable.  Thanks for the clarifications here,
I think I understand better now.  I think it may be difficult to devise
an LRSDP problem that has no saddle points (and prove that it has no
saddle points).

Thanks,

Ryan

-- 
Ryan Curtin    | "Bye-bye, goofy woman.  I enjoyed repeatedly
ryan at ratml.org | throwing you to the ground." - Ben Jabituya