Questions tagged [scip]
SCIP is a source-open solver for (among others) MILPs, MINLPs, ... ask questions about usage, bugs, interfaces, behavior.
7
questions
19
votes
3answers
2k views
Using Neural Networks For Solving Optimization Problems
Recently, I came across the below paper and found it very interesting.
Solving Mixed Integer Programs Using Neural Networks; https://arxiv.org/abs/2012.13349
The idea is to use (train with neural ...
1
vote
1answer
57 views
Importing data into SCIP solver
Is it possible to import data into SCIP from Excel (and then export results to Excel)? If yes, how can I do it?
1
vote
0answers
143 views
Doesn't Pyscipopt handle nonlinear objective functions?
I am trying to solve a large-scale nonlinear problem. Below is the objective function coded for pyscipopt. I have some loops over a list of tuples (r,p,s) in the list RouteTimeStop, and the only ...
7
votes
2answers
962 views
Can I use 'SCIP' solver for PYOMO?
I have an MINLP problem to solve where I was initially using 'ipopt' solver but the solution was not sticking to 'binary/boolean/integer' domain type for a variable. I am not sure which free solver ...
1
vote
1answer
145 views
Branch-and-Price: return gap using SCIP
I implemented a branch-and-price tree in python.
I would like to stop the process after 5 hours and return the gap in % between the best integer solution found so far and the optimal solution.
How ...
9
votes
2answers
622 views
Warm-start SCIP with a solution
I am trying to solve a MIP using SCIP. I let my solver run for some initial time-bound - let's say 10min. After 10min, I check if the problem is solved to optimality or 1% gap. If not, then I would ...
18
votes
3answers
633 views
Column generation stabilisation
Has anyone performed a benchmark of the various stabilisation techniques in column generation? Which ones perform better for set pack/partition/cover problems like VRP? And are there theoretical ...
