How to specify barrier method to use?

Specific Domains Optimization (Mathematical)
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I don’t have Xpress installed so I can’t test this, but try:

model = Model(Xpress.Optimizer)
set_optimizer_attribute(model, "MOI_SOLVE_MODE", "b")

(This isn’t documented, so I opened an issue: Document MOI-specific parameters · Issue #168 · jump-dev/Xpress.jl · GitHub)

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