Philip Taffet
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Recent activity by Philip Taffet
Astronomically low node throughput; major degeneracy?
AnsweredHi, I'm trying to diagnose a large MIP model that appears to hang. Unlike previous models that have seemed to hang because they get stuck trying cuts at the root node, this model seems to select a ...

Injecting Heuristic Solution with Callback is Very Slow
OngoingHi, I have a heuristic for a difficult MIP I am solving. I'm using two processes, similar to How do I inject a solution calculated in a separate process? â€“ Gurobi Support PortalÂ . Although my heuri...

Presolve or >4 threads makes feasible nonconvex model infeasible
OngoingI have a relatively small but nonconvex quadratic optimization model that exhibits some strange behavior. When I run it with more than 4 threads, Gurobi reports it is infeasible. When I run it wit...

Issues calling cbStopOneMultiObj
AnsweredI'm trying to run each step in a multiobjective optimization problem for the longer of 100s or 5 seconds after solving the root node. It seemed like the best way to implement that was with a callb...

Multiscenario returns infinity objective value for some feasible scenarios
AnsweredI'm trying to debug some very strange behavior on a model with thousands of scenarios (each scenario corresponds to a subproblem in a DantzigWolfelike decomposition). All scenarios are minimizati...

grbtune should take baseline parameters
AnsweredWhen tuning performance on a model, I sometimes have some idea of parameters that seem to work well, either from a previous related model, trialanderror, or some understanding I have of the model...

Tuning amount of time spent with warm starts
AnsweredI'm trying to solve a difficult MIP using warm starts based on a model with extra constraints. Basically, I have an idea what some sums of variables in the full model may be. With these additional ...