Marika Karbstein
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Activity overview
Latest activity by Marika Karbstein-
Marika Karbstein commented,
When you do matrix multiplication, the dimensions need to match. You need to use MVar.transpose().Respecting the dimension of matrix I, the line should be m.addConstr(A.transpose() @ A == I)
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Marika Karbstein commented,
Hi Runqiu, No, the difference is that your callback does not do anything during presolve. Because you have if where == GRB.Callback.MIP: Hence, presolve is completed and not interrupted because of ...
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Marika Karbstein commented,
Hi Runqiu, As long as you set a time limit that is smaller or equal to 7200 before calling self.m.optimize(callback=stop_at_feasible) your callback function is useless. When setting the time limit...
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Marika Karbstein commented,
How many variables have a non-zero coefficient in one constraint (on average)?Could you reduce the problem so that you can write an MPS file? Then, compare the memory consumption when building the ...
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Marika Karbstein commented,
Hi Nikola, If I understand correctly, out-of-memory occurs when model building. Then, using the Gurobi cloud will not help.I think there is no other way than trying to identify what exactly causes ...
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Marika Karbstein commented,
I have the same experience. And I did not find any solution for this.For me, the only option is to set termination parameters in the code when running Gurobi in Jupyter notebook, i.e., set TimeLimi...
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Marika Karbstein commented,
Hi Matteo, With Gurobi 10, the memory requirements for the barrier were massively overestimated in some cases. Setting the BarOrder parameter helped here to not run in this overestimation. This iss...
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Marika Karbstein commented,
Please have a look at our Tutorial: Preparing a Minimal Reproducible Example.
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Marika Karbstein commented,
Please check the answers in this post.
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Marika Karbstein commented,
Hi Ludwig, In your code, you have modeled if "finish"=1 then "beet_flow"=0,This relation does not restrict "beet_flow" in case "finish" has the value 0. So, you can have both 0.You probably want to...