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Fix PrimalStatus when multiple solutions are available in DUAL_INFEASIBLE #623

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Merged
merged 2 commits into from
Mar 14, 2025
Merged

Fix PrimalStatus when multiple solutions are available in DUAL_INFEASIBLE #623

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0ec248b
Fix PrimalStatus when multiple solutions are available in DUAL_INFEAS…
odow Mar 13, 2025
fa90e73
Update MOI_wrapper.jl
odow Mar 13, 2025
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6 changes: 1 addition & 5 deletions src/MOI_wrapper/MOI_wrapper.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -2923,12 +2923,8 @@ function MOI.get(model::Optimizer, attr::MOI.PrimalStatus)
_throw_if_optimize_in_progress(model, attr)
term = MOI.get(model, MOI.TerminationStatus())
if term == MOI.DUAL_INFEASIBLE || term == MOI.INFEASIBLE_OR_UNBOUNDED
if attr.result_index != 1
return MOI.NO_SOLUTION
elseif _has_primal_ray(model)
if attr.result_index == 1 && _has_primal_ray(model)
return MOI.INFEASIBILITY_CERTIFICATE
else
return MOI.NO_SOLUTION
end
end
# Check SolCount explicitly instead of ResultCount to avoid returning 1 when
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19 changes: 19 additions & 0 deletions test/MOI/MOI_wrapper.jl
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Expand Up @@ -1599,6 +1599,25 @@ function test_precompile()
return
end

function test_multiple_solutions_when_dual_infeasible()
if Gurobi._GUROBI_VERSION < v"11"
return
end
model = Gurobi.Optimizer(GRB_ENV)
MOI.set(model, MOI.Silent(), true)
x, _ = MOI.add_constrained_variable(model, MOI.Interval(0.0, 1.0))
y = MOI.add_variable(model)
MOI.set(model, MOI.ObjectiveSense(), MOI.MIN_SENSE)
f = 0.25 * y * y - 1.0 * x * y - 1.0 * y + 1.0
MOI.set(model, MOI.ObjectiveFunction{typeof(f)}(), f)
MOI.optimize!(model)
@test MOI.get(model, MOI.TerminationStatus()) == MOI.DUAL_INFEASIBLE
for i in MOI.get(model, MOI.ResultCount())
@test MOI.get(model, MOI.PrimalStatus()) == MOI.FEASIBLE_POINT
end
return
end

end # TestMOIWrapper

TestMOIWrapper.runtests()
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