We consider both facial and symmetry reduction techniques for semidefinite programming, SDP. We show that the two together fit surprisingly well in an alternating direction method of multipliers, ADMM, approach. The combination of facial and symmetry reduction leads to a significant improvement in both numerical stability and running time for both the ADMM and interior point approaches. We test our method on various doubly nonnegative, DNN, relaxations of hard combinatorial problems including quadratic assignment problems with sizes of more than $n=500$.
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View Facial Reduction for Symmetry Reduced Semidefinite Programs