Read .lp file into JuMP model in direct mode

Specific Domains Optimization (Mathematical)
1

Is it possible to read a .lp file into a JuMP optimization model in direct mode? I’m not sure how to combine direct_model and read_from_file to achieve this.

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2

What solver is in direct_model?

I guess you could do:

model = direct_model(Gurobi.Optimizer())
lp = read_from_file("model.lp")
MOI.copy_to(model, lp)
3

I’m planning to use Gurobi. That approach is raising the following error:

ERROR: copy_to is not supported by the solver Model. Did you mean to call optimize!(dest::AbstractOptimizer, src::ModelLike) instead?

4

I think that this will work, at least it worked in my computer locally with HiGHS.

model = direct_model(Gurobi.Optimizer())
lp = read_from_file("model.lp")
MOI.copy_to(backend(model), lp)
optimize!(model)

Other possibility is to call MOI.optimize! directly

model = direct_model(Gurobi.Optimizer())
lp = read_from_file("model.lp")
MOI.optimize!(backend(model), lp)
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