Yingkai Song
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Activity overview
Latest activity by Yingkai Song-
Yingkai Song created a post,
Questions about Gurobipy Versioning and License Compatibility
AnsweredHi there,I’ve installed Gurobi on my computer using the official installer from the Gurobi website, and I’ve also installed gurobipy via Python. I have a few questions regarding versioning and lice...
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Yingkai Song created a post,
Statistics for Gurobi's piecewise linear approximation
AnsweredDear Sir or Madam, I am using Gurobi's piecewise linear approximation for the so-called function constraints. I set the following parameters: model.Params.FuncNonlinear = 0 model.Params.FuncPiec...
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Yingkai Song commented,
Hi Riley, Thanks for your reply! Even though I could not find the source again, several days ago, I found a post from Gurobi saying that to use nonlinear term such as sin in Gurobi, I have to us...
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Yingkai Song created a post,
Nonlinear global optimization in pyomo (calling gurobi)
AnsweredHi there, I am trying to solve a global optimization problem (with nonlinearities sin() and cos()) using Gurobi v11 in Pyomo. I have follows the v11 manual to create a factor representation for thi...
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Yingkai Song commented,
Hi Jaromil, Many thanks for your reply and happy new year! If I am understanding correctly, the v11 handles nonlinear functions such as log() and exp() by dynamic outer approximation in a branch-an...
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Yingkai Song created a post,
Will Gurobi solve general nonconvex models to global optimality in future?
AnsweredHi there, Not sure if this is the correct place to post this question. From my experience, Gurobi solves MIQCPs significantly faster than other general global optimization solvers. However, I am w...
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Yingkai Song commented,
Hi Jaromil, Sorry, since the code contains some of our unpublished work, I may not be able to share it with this community. This situation may change soon and I will let you know. Thanks again for...
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Yingkai Song commented,
Hi Jaromil, Many thanks for your thorough and detailed reply! 1 and 2: I should have recalled that the dual values in principle make sense when the fixed model is convex. However, my fixed MIQCP m...
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Yingkai Song created a post,
Issue when getting dual optimal solution for an MIQCP model
AnsweredDear Sir or Madam, I am solving multi-time-period pooling problems (nonconvex MIQCP with binaries) using GUROBI. While GUROBI can quickly find a primal optimal solution within the predefined tolera...