ortools Debug

[Sonia Almodóvar]

Hello, 

I have two questions. I am using or-tools python library. 

- Is there any way to debug what happen when solver is executed? For example, which branches are visited, which one was failed a why?. ... 

- Could I add a constraint after an IntervalVar was performed? 

Thank you

[Driss Lahlou]

Hello Sonia,

- Is there any way to debug what happen when solver is executed? For example, which branches are visited, which one was failed a why?. ... 

There are several parameters that you can set to change the behavior of the solver, they are defined with Google Protobuf. In your case, I think trace_search is what you're looking for. You can also try trace_propagation to trace the propagation of constraints over variables.

To set these parameters, you can do like so :

search_parameters = pywrapcp.Solver.DefaultSolverParameters()
search_parameters.trace_search  = True
search_parameters.trace_propagation  = True
solver = pywrapcp.Solver("solver_name", search_parameters)

- Could I add a constraint after an IntervalVar was performed?

Yes you can.

I hope this helps.

Regards,

Driss

[Sonia Almodóvar]

- Could I add a constraint after an IntervalVar was performed?

Yes you can.

How can I do it? Could you give me an example? 

Thank you