Arezoo Jafari

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Latest activity by Arezoo Jafari
  • Arezoo Jafari commented,

    Hi Maliheh,   I appreciate your help.  What do you mean by using the solution of the subproblem and solving the master problem? It is unclear because the decision variables in the subproblem differ...

  • Arezoo Jafari commented,

    Hi Maliheh, Thank you so much for your response. It was super helpful.  When I use the variable attribute Start to fix a subset of variables to starting values, I get the same objective value.  I n...

  • Arezoo Jafari commented,

    Thanks for your response. It seems that you read all decision variables from "MP.sol" and add them to the first iteration in the Master problem. But I force the model to get similar values only f...

  • Arezoo Jafari created a post,

    Should I get the same optimal solution when the initial point is different?

    Answered

    Hi everyone, I designed a two-stage stochastic programming model and solved it using Benders Decomposition. When I forced the model to have a different initial point, the optimal solution and objec...

  • Arezoo Jafari commented,

    Hi sorry for that. I accepted it.Please let me know if you have any trouble accessing that. 

  • Arezoo Jafari commented,

    Hi Malileh,  Thanks for your help. I created a folder on GoogleDrive. The link is here: https://drive.google.com/drive/folders/1UfyCL62lALr4di1Y8St14Uwmyu_SkQMk?usp=sharing  Thank you!

  • Arezoo Jafari commented,

    Hi Greg, I noticed your post regarding "Is Gurobi Optimizer deterministic" and you mentioned that  --> "if you change any inputs, including small changes like: Parameter values Rounding of coeffic...

  • Arezoo Jafari commented,

    Thank you for your help. I really appreciate that. Yes, the presolve fixes the variables X and continues finding the optimal values for the other decision variables. I also used model.write("soluti...

  • Arezoo Jafari commented,

    Hi Maliheh, Thank you so much for your response. Yes, I solved the model twice with the exact same input and parameters but the objective function is not the same. As you advised, I kept the defaul...

  • Arezoo Jafari commented,

    As I have a two-stage model, it is divided into primal model (master problem) and dual problem (dual sub problem). I just added model.Params.OptimalityTol = 1e-03 and model.Params.Method = 0 to the...