Jiangfei DUAN
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Latest activity by Jiangfei DUAN
Jiangfei DUAN commented,
Hi, Thanks for your reply. I set a partial solution, but it solves the partial solution quickly, and here is my log. The log without setting initial solution Academic license  for noncommercial ...

Jiangfei DUAN commented,
Hi, Jaromił, Thanks a lot. You can work with gurobipy and its objects the same way as with other Python modules. This means that you can use other modules such as, e.g., numpy, and the algorithm i...

Jiangfei DUAN created a post,
gurobi set initial solution slow down the solver
OngoingHi, gurobi community, I am trying to use an initial solution to speed up the solver (MILP model). But in my case, the initial solution sometimes slow down the solving speed. Here are my two result...

Jiangfei DUAN commented,
Hi, Sorry for my late reply. With the algorithm, I only need to keep K+2 nodes at most at the same time, which can reduce most of the nodes. I think, this can reduce memory (I am not sure if my und...

Jiangfei DUAN created a post,
Gurobi MILP branchandcut algorithm
AnsweredHi, gurobi community, I am trying yo solve a MILP problem with gurobipy. But my model is too large with millions vars and constraints. When solving the problem, I notified that the memory is runn...

Jiangfei DUAN commented,
Hi, Matthias, Thanks a lot, I am trying to follow your advices. But I find, maybe the best way to speed up is to reformulate my model with linear constraints only... Besides, I have a question. I t...

Jiangfei DUAN created a post,
How to determine the speed bottleneck of my Model?
AnsweredHi, I am new to Linear Programming. To solve my problem, I modeling a complex model, and it takes too long to get a result. I want to speed up it, but I cannot point out the bottleneck. 1. I wonder...

Jiangfei DUAN commented,
Thanks a lot. I got it.

Jiangfei DUAN created a post,
How to model the problem of cutting a polyhedron into parts
AnsweredHi, I met a problem in my modeling. Here I abstract a minimal question of my problem. Suppose I have a polyhedron (Rectangle, cube for example). For simplify, I use a rectangle as an example. The h...

Jiangfei DUAN commented,
Hi Matthias, Thanks for your reply. 1. \(d_i\) represents the dimension bound of the ith dim, for example, a 3dim array (2, 3, 4), \(d_0 = 2, d_1 = 3, d_2 = 4\), the array has 2*3*4 elements. ...