Jacob Jin
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Recent activity by Jacob Jin-
Hi, I have fixed the error and retrieved the extreme ray. The extreme ray is a 0-vector. It is abnormal. Why gurobi fail to give a valid extreme ray? Thank you so much.
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Thanks!
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Hi Jaromil, How could I reset the coefficient of a specific variable in a specific objective function when I deal with a multi-objectives problem in Gurobi? Thank you so much!
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I find the point! from numpy import *import numpy as npimport pandas as pdimport gurobipy as gbfrom gurobipy import *from gurobipy import GRBfrom itertools import permutationsimport timeimport warn...
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Hi Jaromi, I have tried your suggestion but it didn't work. The thing I can ensure is that I didn't let the sub_dual problem be preresolved when I defined the objective function in the callback fun...
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Hi, Jaromił As for the difficulty we talked about, I realized that when I just set the sub_dual problem's presolve parameter as -1 in the callback function, the log result showed that the solver di...
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Sorry for that. Here is the c202.txt. https://drive.google.com/file/d/1sG4W6F2tGwZ7rTs-TVZOdHh-7FOweXYm/view?usp=sharing Thank you!
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Sorry, I didn't get your meaning about Could you please also incorporate this model change after the first iteration into your snippet to reproduce the issue? My core code: https://drive.google....
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Hi, I tried your suggestion. I feed a data which can be solved by reset method. In the first model, the sub dual problem has been solved for 231 times(6.3411 s in total) to get the final result, wh...
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To be more specific, I use the reset method in the callback function m_sub.reset(1)# m_sub.Params.Presolve = -1start = time.time()m_sub.optimize()end = time.time()print(m_sub.Runtime)print(m_sub.o...