Algorithms – Gurobi Support Portal

How optimization algorithms work & improving their performance

Adding a few variables and constraints makes the model nearly unsolvable Awaiting user input
- Fikri Kucuksayacigil
- October 25, 2021 16:57
0 votes 1 comment
Dual values for maximization problem with and without variable upper bound Awaiting user input
- Grzegorz Siekaniec
- October 24, 2021 13:48
0 votes 1 comment
Optimal solution found early but long time to close gap Ongoing
- Marta Vanin
- October 22, 2021 15:40
0 votes 2 comments
insert heuristic into CallBack Answered
- Murilo Machado
- October 19, 2021 20:46
0 votes 4 comments
pre-solve algorithm Answered
- Zohar Levi
- October 12, 2021 23:16
0 votes 1 comment
User Cuts cut off too much (done after one cut) - Problem with Presolver Ongoing
- Sebastian Kreuz
- October 11, 2021 06:42
0 votes 2 comments
Callback cut count and cut count in the MIP log are not equal Answered
- Jihye Jung
- October 11, 2021 11:54
- Edited
0 votes 3 comments
Can we add user cuts on root node only? Answered
- Cheng-Lung Chen
- October 09, 2021 20:16
0 votes 2 comments
Lazy Constraints with Presolve Answered
- Veronika Eisgruber
- October 08, 2021 10:42
0 votes 1 comment
Branch-and-cut performance and PreCrush Answered
- Cheng-Lung Chen
- October 04, 2021 16:42
0 votes 2 comments
warm start LP solver in Gurobi Answered
- yunzhuang shen
- October 04, 2021 05:46
0 votes 2 comments
L1 minimization Answered
- L1fe
- September 30, 2021 17:20
- Edited
0 votes 7 comments
Custom heuristic implementation for MIQCP Answered
- Shuvomoy Das Gupta
- September 30, 2021 15:56
0 votes 4 comments
User cuts are not counted in the MIP log Ongoing
- Jihye Jung
- September 30, 2021 04:36
0 votes 3 comments
pre-solve is buggy Ongoing
- Zohar Levi
- September 16, 2021 09:36
0 votes 5 comments
How do I specify the algorithm used to solve my model in pyomo? Answered
- Amanda Farnsworth
- September 08, 2021 17:19
1 vote 1 comment
Branch-and-Bound integer/float Answered
- Tessa Meyer
- September 06, 2021 15:49
0 votes 1 comment
Crossover Takes Long Answered
- Wenbo Ma
- September 06, 2021 02:50
- Edited
0 votes 1 comment
Stop callbacks Answered
- Juan Calle
- September 03, 2021 05:56
0 votes 1 comment
Bug with "presolve" Answered
- Haochen Sun
- September 02, 2021 11:39
- Edited
0 votes 1 comment
Unable to find sub-optimal solution Answered
- Mohit Kumar
- August 31, 2021 07:11
1 vote 3 comments
Some questions about what I do to deal with the slow decline of gap value. Answered
- Yanbo Fan
- August 29, 2021 16:12
0 votes 6 comments
Bug report: Different settings of MIPFocus result in different number of solutions Answered
- Kai Hu
- August 26, 2021 11:57
0 votes 6 comments
Barrier algorithm and Unboundedness detection
- Abdulkerim Benli
- August 25, 2021 17:09
0 votes 0 comments
About the MIPgap Answered
- jiaze ma
- August 25, 2021 02:42
0 votes 3 comments
Numeric stability with SOC Answered
- Leonard Göke
- August 24, 2021 16:32
- Edited
0 votes 2 comments
What happens after root relaxation has been solved? Long time before exploring further nodes according to log Answered
- Hendrik Weber
- August 24, 2021 12:51
- Edited
1 vote 2 comments
Presolve information Answered
- Alejandro Arenas
- August 23, 2021 21:17
0 votes 1 comment
Solver is Frozen Answered
- Wenbo Ma
- August 22, 2021 20:31
0 votes 1 comment
Beaten by a naive method solving MILP Ongoing
- Zohar Levi
- August 19, 2021 23:34
0 votes 4 comments

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