Helloooooooooooooooooooo !!! The Gurobi and CPLEX backends for MixedIntegerLinearProgram() are extremely > convenient. >
Glad to learn it :-) > Is there any prospect of solver_parameter() being implemented in the > Gurobi backend? > None from me ! I use CPLEX at the moment but I never mess with the solver parameters in the first place. I think I implemented #10785 for a friend who needed it :-) > At present, when I use MixedIntegerLinearProgram() with solver="Gurobi" > and try to set a Gurobi parameter using p.solver_parameter(), I get a > "not implemented" error. Yepyepyep ! The solver_parameter method forwards everything it is given to thebackend, and there is no solver_parameter in the Gurobi backend. I'm most interested in changing the tolerance for equality constraints for > an MIP. I'd also like to change the 'threads' parameter (to be polite to > colleagues with whom I share an 8 core machine). > Ahahahah. You could also use "nice" when you start Sage ! This way Gurobi will not eat all the ressources :-) I'd switch to solver="CPLEX", for which -- according to the documentation > -- the backend does implement > solver_parameter(), except that CPLEX is taking forever to solve MIPs that > Gurobi solves quickly. It could be a difference i the default parameter > settings. > Well... Would you be willing to write this patch yourself ? I can help a bit and I will most probably be the one to review your patch before it gets included into Sage, but I do not even have Gurobi installed on my machine right now... Their license procedure is a nightmare :-) Nathann -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
