Philip Taffet
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Posts
Votes on 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 ...
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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? – Gurobi Support Portal . Although my heuri...
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Presolve or >4 threads makes feasible non-convex model infeasible
OngoingI have a relatively small but non-convex 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...
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Issues calling cbStopOneMultiObj
AnsweredI'm trying to run each step in a multi-objective 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...
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Multi-scenario 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 Dantzig-Wolfe-like decomposition). All scenarios are minimizati...
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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, trial-and-error, or some understanding I have of the model...
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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 ...