Gap Type
The basis against which a run's optimality gap was computed. Runs on problems with a reference solution record the reference's type; runs on problems without one are gapped against the best objective value found across all runs of that problem within the experiment.
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Gap against a known optimum (exact optimality gap).
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Gap against the best known solution for the problem.
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Gap against the best objective value found across all runs of the problem in this experiment (relative gap; the best run's gap is zero by construction).