Riley Clement
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Activity overview
Latest activity by Riley Clement-
Riley Clement commented,
MIPFocus is a meta-parameter which is used to influence other parameters. I expect it is setting making the presolve routine aggressive, which can introduce numerical issues. Please refer to Solv...
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Riley Clement commented,
Hi Marilena, Unfortunately barrier is not an feasible approach here. When your subproblem is infeasible you need to access the farkas dual and that requires InfUnbdInfo to be set to 1. The docs f...
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Riley Clement commented,
Hi Abbas, Unfortunately this problem does not have a good solution. The MPS format is not 100% standardized among solvers and frameworks, and particularly so when it comes to more exotic features ...
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Riley Clement commented,
Hi V, Take a look at our section on Most Important Parameters in our documentation. I would start there, with parameters like MIPFocus and Presolve. From your log we can see there is lots of branc...
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Riley Clement commented,
Hi Yilu, I think a similar question was asked here last year. Please take a look at the following post: https://support.gurobi.com/hc/en-us/community/posts/27095292925969/comments/27140622551825 -...
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Riley Clement commented,
Hi Abbas, By way of example, the lazy constraints in our tsp.py example are used to eliminate potential solutions that violate subtour constraints, because they do not correspond to valid tours. ...
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Riley Clement commented,
Hi Abbas, If I write a problem as an LP format ... may this lead to the different model fingerprint? No it shouldn't. You can test this with toy models: import gurobipy as gpm1 = gp.Model()x = m...
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Riley Clement commented,
Hi Zengyu, First, note that variables in Gurobi have a default lower bound of 0 unless specified otherwise. This is a common source of unexpected infeasibility. The upper bound of eps_2 is 0.418 a...
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Riley Clement commented,
Hi Muhammed, It sounds like you are mixing Pyomo code with gurobipy code (we don't have a ConcreteModel object in gurobipy) which will not work. - Riley
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Riley Clement commented,
Hi Henry, "Benders cuts" are actually "lazy constraints" using Gurobi terminology (see What is the difference between user cuts and lazy constraints?). You will need to add them using Model.cbLazy...