How to set optcr = 0 in GAMSpy to force optimal MIP solution?

GAMSPy
1

Description of the issue

Hi everyone,
I am working on a facility location problem using GAMSpy and trying to match the results with my original GAMS implementation.

In GAMS, I use the following line to force the solver to reach the proven optimal solution with zero gap:

option optcr = 0;

I would like to do the same in GAMSpy, to ensure that the model doesn't stop until an optimal solution is found (gap = 0.0). However, I could not find a clear way to apply optcr in GAMSpy.

Is there a recommended way to do this in the latest version of GAMSpy?

What I have tried so far:

model.setOption("optcr", 0) → returns 'Model' object has no attribute 'setOption'
model.options.optcr = 0 → 'Model' object has no attribute 'options'
m.setOption("optcr", 0) → 'Container' object has no attribute 'setOption'
Tried passing options={"optcr": 0} inside the Model(...) constructor → results in a TypeError
None of these worked. Is there a correct way to apply solver options like optcr in GAMSpy?

# Error message and stack trace

Error message and stack trace goes here.

# GAMSPy version
This information can be retrieved with:

gamspy -v

2

relative_optimality_gap from gamspy options does it for you.

An example on how to use these options can be found here.

Hope this helps.

Best, Atharv