[Symphony-tickets] [SYMPHONY] #150: Possible bug, converges to very non-optimal solution

[SYMPHONY]

#150: Possible bug, converges to very non-optimal solution
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 Reporter:  partaniamit  |      Owner:  tkr
     Type:  defect       |     Status:  new
 Priority:  critical     |  Milestone:  5.2
Component:  Not Sure     |    Version:  5.6.13
 Keywords:               |
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 I am using symphony to solve some simple and some complex MILPs. For the
 attached problem (MPS) the lower bound and upper bound converge to a
 solution which is far away from optimum. All other solvers (CBC, CPLEX,
 Gurobi) give the right answer which is roughly 0.004, but Symphony gives
 0.5 as answer.

 Another possible bug is that sometime for very simple milps, preprocessing
 results infeasibility when I use callable library, but not in the
 interactive mode. When I set prep_level to -1 (no preprocessing) it gives
 the right answer. I am attaching the mps file.

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Ticket URL: <https://projects.coin-or.org/SYMPHONY/ticket/150>
SYMPHONY <http://projects.coin-or.org/SYMPHONY>
The SYMPHONY framework for parallel branch-and-cut algorithms.