GuanghuiLiu

Juniper (Julia/JuMP) has the difficulty in convergence during MIP FP iterations

5

I am using Juniper in Julia/JuMP to solve a feasibility problem, whose constraints are linear. The FP iterations seem to be going on forever, having the difficulty in convergence. I...

Using AmplNLWriter.Optimizer(Couenne_jll.amplexe)), both primal_status and termination_status show solutions are found. But both objective and decision variables are empty. Please refer to https://github.com/jump-dev/AmplNLWriter.jl/issues/160 and https://stackoverflow.com/questions/74225064/julia-jump-couenne-how-to-get-intermediate-or-best-feasible-solutions-when-ti?noredirect=1#comment131053475_74225064

Couenne - Another bug. For an infeasible problem, status shows locally solved.

1

using AmplNLWriter, Couenne_jll model = Model(() -> AmplNLWriter.Optimizer(Couenne_jll.amplexe)) ... optimize!(model) println("primal_status=", primal_status(model)) println("termination_status=", termination_status(model)) print("raw_status(model)=", raw_status(model)) The couenne.opt file is [couenne.opt1.txt](https://github.com/coin-or/Couenne/files/9905284/couenne.opt1.txt) The .lp file is [Couenne_model1.lp.txt](https://github.com/coin-or/Couenne/files/9905285/Couenne_model1.lp.txt) The .nl file is...