[Coin-discuss] Open-source Modeling Languages

[Kipp Martin]

Hi JP:
> 
> I've done some preliminary work on linking ASCEND to IPOPT, but still
> have a some work to do. Adding new solvers is quite straightforward in
> general, but in the case of IPOPT I am having to do some work to provide
> a sparse Hessian matrix calculation routine, and that still remains to
> be done. And volunteers are very welcome, of course!

We have a COIN-OR open source project, Optimization Services (OS),

see

http://projects.coin-or.org/OS

that is designed, among other things, to hook modeling languages to 
solvers. They can be hooked using Web Services or locally on the same 
machine.

We have hooked to IPOPT and numerous other solvers. We provide the 
Algorithmic Differentiation through another COIN-OR project

http://projects.coin-or.org/CppAD.

Our OS library provides a sparse Hessian matrix calculation (through 
CppAD). We have also hooked to other nonlinear solvers such as LINDO and 
Knitro.

The bottom line is that if you could produce our OSiL (Optimization 
Services Instance Language) for representing problem instances, then 
hooking to Ipopt and numerous other solvers will be no problem.

OSiL is a very general XML representation for optimization instances.

See

https://www.coin-or.org/OS/publications/OSiL1.pdf

for a description of OSiL.

See http://www.optimizationservices.org/

Regards



-- 
Kipp Martin
Professor of Operations Research
and Computing Technology
Graduate School of Business
University of Chicago
5807 South Woodlawn Avenue
Chicago, IL 60637
773-702-7456
kipp.martin at chicagogsb.edu
http://gsbkip.chicagogsb.edu
http://www.coin-or.org