On improving convex quadratic programming relaxation for the quadratic assignment problem
Relaxation techniques play a great role in solving the quadratic assignment problem, among which the convex quadratic programming bound (QPB) is competitive with existing bounds in the trade-off between cost and quality. In this article, we propose two new lower bounds based on QPB. The first dominates QPB at a high computational cost, which is shown equivalent to the recent second-order cone programming bound. The second is strictly tighter than QPB in most cases, while it is solved as easily as QPB.
quadratic programming quadratic assignment problem lower bound capacitated transportation problem 90c10 90c20 90c26