How does the MPS writer of Gurobi work?
using JuMP, Gurobi model = Model(Gurobi.Optimizer) @variables(model, begin 0 <= x <= 5 0 <= y <= 10, Int z, Bin end) @objective(model, Max, x + 2y + 5z) @constraint(model, x + y + z <= 10) @constraint(model, x + 2y + z <= 15) Gurobi.write_model(model.moi_backend.optimizer.model.inner, "test.mps")
gives me an empty file:
NAME ROWS N OBJ COLUMNS RHS BOUNDS ENDATA
JuMP.write_to_file(model, "test_JuMP.mps") would work.
The reason seems to be that the
inner model is empty until
optimize! is called.
How do I transfer the model without a call of