Warm start for CBC?

[Luis de la Torre]

The pyomo documentation says that passing the option warmstart=True to solve() allows warm starts with some solvers.

The following:

opt = SolverFactory('cbc')

opt.solve(model, warmstart=True)

gives me the error

ValueError: ProblemWriter_cpxlp passed unrecognized io_options:

	warmstart = True

Is there a way to warm start CBC through Pyomo? I'm using CBC 2.8.8.

Thank you,

Luis de la Torre

[Gabe Hackebeil]

Currently there is no way, that I am aware of, to warmstart CBC through the Pyomo LP file interface.

Out of curiosity, are you aware of any CBC documentation that discusses how to provide warmstart information through its LP file interface? Solvers like CPLEX and Gurobi use an extra MST file. If you come across anything let us know.

Another thing to look into would be compiling CBC with support for the ASL interface (NL files). Starting points are automatically included in NL files written by Pyomo (no warmstart keyword is necessary), and it might be that CBC will use this information for a MIP warmstart.

Regards,

Gabe

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