Unknown status returned by CPLEX

[Romain Montagné]

Hello,

I am running a LP with pulp and cplex, and get the following error : 

pulp.solvers.PulpSolverError: Unknown status returned by CPLEX: integer optimal solution

So I understand the status is not recognized by pulp. Have the cplex statuses evolved ? If so should it be added to pulp's list of statuses?

Or maybe the error comes from somewhere else. Any help is welcome. 

[Romain Montagné]

I checked the git repo and found these lines in the cplex api file :

     

   # TODO: check status for Integer Feasible
        cplexStatus = {
            "optimal": constants.LpStatusOptimal,
            }
        if statusString not in cplexStatus:
            raise PulpSolverError("Unknown status returned by CPLEX: "+statusString)

So I guess the status "integer optimal solution" is new and should be added to cplexStatus for checks.

[Franco Peschiera]

It's quite possible. If you can create a ticket with a reproducible example, that would be great. Also with the version of CPLEX you're using.

We have a dictionary of CPLEX codes that we may need to upgrade.

[Romain Montagné]

Sure, will do !