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  • May 14 01:33
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  • Jan 23 23:57
    adambaskerville commented #273
Jack Poulson
@poulson
see, e.g., elemental/Elemental@75c5f5a
Ryan H. Lewis
@rhl-
I mean why do you need a unique_ptr, it seems like you just need to move some grids around
Jack Poulson
@poulson
and elemental/Elemental@69b6eb8 for the El::Grid change
Ryan H. Lewis
@rhl-
Be back in a bit. On a plane :) taking off
Jack Poulson
@poulson
Comments welcome! elemental/Elemental#214
Jack Poulson
@poulson
the sparse-direct interface shouldn't be so laughably complicated anymore
Ryan H. Lewis
@rhl-
I'm without a laptop this week. Just have a phone
I can review but it would require Waiting until Jan 1
Jack Poulson
@poulson
no worries
the improvement in the interface is substantial enough that it will be worth merging once the dust settles (probably in several more days)
Jack Poulson
@poulson
It seems someone removed the links to Elemental on the Wikipedia pages for permissively licensed LP, QP, and SOCP solvers :-(
also, I am bundling in a Mathematical Programming Software (MPS) reader in the sparse-direct changeset
easily checking that one gets the same results as http://www.netlib.org/lp/data/minos is useful
Ryan H. Lewis
@rhl-
Why did they remove elemental ?
Jack Poulson
@poulson
they removed all open source links
Carlos Borges
@cecborges_twitter
Hi Jack, are there any plans to include GMRES or any other iterative solvers in Elemental?
Jack Poulson
@poulson
there is a GMRES in Elemental
it just isn't documented yet I think
it is heavily used within Elemental's Interior Point Methods
see include/El/solve/FGMRES.hpp for the flexible GMRES implementation
and include/El/solve/LGMRES.hpp for the left-preconditioned standard GMRES
with that said, the iterative solvers in the library have only existed to the point that they were needed for the more "direct" techniques like the IPMs
not that I am opposed to the iterative solvers improving
Jack Poulson
@poulson
Hmm, it seems that the Clang bug response time is not so impressive :-( https://llvm.org/bugs/show_bug.cgi?id=31249
Carlos Borges
@cecborges_twitter
Thanks for the response. I didn't see it in any of the available documentation. It is good to know. Best
Jack Poulson
@poulson
@cecborges_twitter The documentation is currently very behind due to many recent changes to the IPMs, sparse-direct solvers, etc.
Carlos Borges
@cecborges_twitter
@poulson Thanks for letting me. I noticed that you have LSQR implemented using matrices as input, do you have plans to implement it using functions as input?
Jack Poulson
@poulson
I don't recall committing LSQR
do you have a link?
Carlos Borges
@cecborges_twitter
isn't your least squares function implementing LSQR? I thought I read that somewhere. Maybe I am wrong.
Jack Poulson
@poulson
LeastSquares uses Flexible GMRES with the preconditioner being an iteratively-refined application of a sparse-direct solution to a nearby quasi-semidefinite problem
there is a note that Michael Saunders tends to use LSQR for this rather than FGMRES
I like GMRES(k) and FGMRES(k)
Carlos Borges
@cecborges_twitter
ah ok. my bad, I saw lsqr there and I thought that the implementation was using it. Sorry about that. But anyway, do you plan to implement LSQR using functions as input?
Jack Poulson
@poulson
it would be nice but isn't in my critical path right now
I'm in the middle of refactoring the IPMs
a contribution would be welcome
Carlos Borges
@cecborges_twitter
I might implement that for my project. Unfortunately, I can't generate matrices. I implemented a randomized QR that can be changed to become a randomized SVD very easily that takes functions as input. I can send to you in case you want to clean it eventually and include in the code.
Jack Poulson
@poulson
the best mechanism is to submit a Pull Request via GitHub and we can take it from there
I assume you are referring to randomized low-rank QR?
Carlos Borges
@cecborges_twitter
sure. I will talk with the boss here and see if it is ok to send.
I am
Jack Poulson
@poulson
I thought you were in academia? ;-)
Carlos Borges
@cecborges_twitter
I am
Jack Poulson
@poulson
you have to ask for permission to release open source?
Carlos Borges
@cecborges_twitter
I am at ICES. I worked with George
Jack Poulson
@poulson
fair enough
Carlos Borges
@cecborges_twitter
I don't know if he wants to release it. I think he wants it. But I would not release it before asking him
Jack Poulson
@poulson
ah, fair enough if it is existing project
I would worry more about whether Elemental is the right place to release rather than if it should be released though