Adding Constraints and Penalties at the same time.

[dvnoble]

Hello!

I'd like to know how can I add a constraint and set its penalty at the same time. Which is the best way of doing that? Can I do it in batches (adding many constraints and their respective penalties in a single command)?

I haven't found an answer in the documentation, sorry if I missed something.

Thanks

[pedromxavier]

The way to define the penalty factor for a constraint is through the ToQUBO.Attributes.ConstraintEncodingPenaltyHint() atttribute, as in

julia> using JuMP, QUBO

julia> model = Model(ToQUBO.Optimizer)
A JuMP Model
├ solver: Virtual QUBO Model
├ objective_sense: FEASIBILITY_SENSE
├ num_variables: 0
├ num_constraints: 0
└ Names registered in the model: none

julia> @variable(model, 0 <= x[1:3] <= 10)
3-element Vector{VariableRef}:
 x[1]
 x[2]
 x[3]

julia> @constraint(model, c, x[1] + x[2] + x[3] <= 10)
c : x[1] + x[2] + x[3] ≤ 10

julia> set_attribute(c, ToQUBO.Attributes.ConstraintEncodingPenaltyHint(), 20.0)

julia> optimize!(model)

[bernalde]

@dvnoble thank you for creating the issue. Did this resolve it? Where in the documentation would you have expected this to appear? Although limited by hands, we would be happy to incorporate this into the docs and even happier to receive PRs!