Overview of status codes per solver

[Marianne Hoogeveen]

I'm trying to report solver status codes and looking for an overview of status and meanings. I found one for the SAT solver, but now I'd like to find it for the linear solver as well.

This is what I have so far:

pywraplp.Solver.FEASIBLE = 1

pywraplp.Solver.INFEASIBLE = 2
pywraplp.Solver.UNBOUNDED = 3
pywraplp.Solver.ABNORMAL = 4

pywraplp.Solver.NOT_SOLVED = 6

So my questions are the following:

Which am I missing? (is there a number 5?)

Which scenarios are typical for the status to be abnormal or not solved?

[Marianne Hoogeveen]

Oops, forgot pywraplp.Solver.OPTIMAL = 0

[marianne....@gmail.com]

I now encountered a case where the pywraplp solver returns status code 5. No idea what this status means. Anyone?

[Sagar Pingale]

I'm too facing the same problem, did you get any solution regarding this?

[Laurent Perron]

https://github.com/google/or-tools/blob/stable/ortools/linear_solver/linear_solver.h#L442

Laurent Perron | Operations Research | lpe...@google.com | (33) 1 42 68 53 00

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[Marianne Hoogeveen]

@Sagar as Laurent's link seems to suggest, error code 5 means "model invalid". However, if I try pywraplp.Solver.MODEL_INVALID I get the following error:

AttributeError: type object 'Solver' has no attribute 'MODEL_INVALID'

For now, I just map solver status 5 to "model invalid" myself

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[Laurent Perron]

Yes. I suppose the python swig wrapping is not complete.

Laurent Perron | Operations Research | lpe...@google.com | (33) 1 42 68 53 00

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[Corentin "Mizux" Le Molgat]

https://or-tools.github.io/docs/cpp_linear/classoperations__research_1_1_m_p_solver.html#a9f55f5e7a62b45961982063ebc1e9945

https://or-tools.github.io/docs/cpp_linear/classoperations__research_1_1_m_p_solver.html#a573d479910e373f5d771d303e440587d

then python wrapper:

https://github.com/google/or-tools/blob/a4a3d4a786fae1d6b7f1fdbc97d4c4f363212ef1/ortools/linear_solver/python/linear_solver.i#L284-L291

errrrrrr !

On My way to create an issue to track it...
EDIT: https://github.com/google/or-tools/issues/3365