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Questions tagged [pyscipopt]

Used for all problems and questions regarding PySCIPOpt, the Python interface to the SCIP Optimization Suite.

PySCIPOpt is the Python interface to the SCIP Optimization Suite for modeling and solving MINLP problems.

Installation via PyPI or conda:

  • pip install pyscipopt
  • conda install pyscipopt
37 questions
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How to get pyscipopt running on macOS

I am trying to install pyscipopt from the SCIP Optimization Suite in order to use SCIP solver in Python. I already downloaded SCIP Optimization Suite from the SCIP Website. Unfortunately, my mac terminal returns an error when trying: "pip install…
LukPau
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How to Specify the Programming Type in SCIP

I am solving an optimization problem using PYSCIPOPT in Python. I know that I don't need to specify the problem type, that it will automatically detect for me. But I have a special situation where it may be useful. My original problem is MINLP, but…
Tony Mathew
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ImportError: DLL load failed while importing scip: No module found

I'm trying test example: from pyscipopt import Model model = Model("Example") # model name is optional x = model.addVar("x") y = model.addVar("y", vtype="INTEGER") model.setObjective(x + y) model.addCons(2*x - y*y >= 0) model.optimize() sol =…
Man
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induction for SCIPopt's setppc

Regarding SCIP's "constraint handler for the set partitioning / packing / covering": Is it smart enough to deduce all forms that it supports without me having to call the setppc functions directly? Can it handle/detect forms of sum(x) == y where x…
Brannon
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custom propagator via pyscipopt

I'm trying to write a custom value propagator for SCIP. I have some complex logic that can detect additional values that can also be fixed whenever one or several are fixed (via the branching mechanism). I have the code below that apparently makes…
Brannon
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How to import pyscipopt to Google Colab (in the Jupyter Notebook file)?

I usually use SCIP (call PyScipOpt) with Jupyter Notebook (installed via Anaconda) on my Mac, and when I write "from pyscipopt import Model" there is no error (when running it on my machine) but for the large-scale problems I decided to import my…
Lidiia S
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Piecewise Linear Function as Constraint

I'm trying to use pyscipopt to solve a linear programming problem, but am unable to fit the piecewise linear function as a constraint. The constraint is expressed as follows: I've tried to write it as the following: cfm = quicksum(…
Winsor-Mavis
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Implementing multiple branching rules in the same branch and bound tree in PySCIPOpt

I would like to implement a custom branching rule initially (for a few nodes in the top of the tree), and then use Scip's implementation of vanilla full strong branching rule (or some other rule like pseudocost). Is this possible to do using/by…
optimal-br
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Could not build wheels for pyscipopt, which is required to install pyproject.toml-based projects

when installing a module for python, pyscipopt throws an error: Collecting pyscipopt Using cached PySCIPOpt-4.3.0.tar.gz (665 kB) Installing build dependencies ... done Getting requirements to build wheel ... done Installing backend dependencies ...…
Руслан Ашурбеков
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Finding the Simplex tableau information

I am trying to find the simplex tableau information by PySCIPopt wrapper. I called some methods to get the related information like scip.getLPColsData() and scip.getLPRowsData(). However, as the problem cannot throw any issue, it seems the function…
A.Omidi
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OSerror in using psycipopt in python

I wanted to use pyscipopt and I keep getting this error: OSError: [WinError 123] The filename, directory name, or volume label syntax is incorrect: 'C:\Program Files\SCIPOptSuite 8.0.3;D:\softwares\scip-8.0.3\bin' ` import pyscipopt model =…
sahraoui khaoula
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What does BESTSOLFOUND mean in SCIP's callback?

I would like to understand the meaning of BESTSOLFOUND in the SCIP_EVENTTYPE_BESTSOLFOUND. I have tried to write a callback to execute this event handler that can be found here. By referring to the related document it mentioned that: a new best…
A.Omidi
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How do I get all the optimal solutions from my linear programming with pyscipopt?

How do I get all the optimal solutions from my linear programming with pyscipopt? I just want to display them(using print()). I see that my Linear Programming has several optimal feasible solutions. However, I can only view one. The function…
user22146991
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how do I convert constraints to standard form in pySCIPopt?

I'm loading MPS files into SCIP via pyscipopt. I would like to convert the constraints to standard form so that I can get a consistent tableau (via getLPBInvRow). I'm unsure on how to negate existing constraints. I was picturing something like…
Brannon
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How to copy a model when designing primal heuristics with pyscipopt?

I'm trying to design my own heuristics with pyscipopt. In my heuristics, a sub-mip is needed, so I try to copy the current model in this way: from pyscipopt import Model, Heur, SCIP_RESULT, SCIP_PARAMSETTING, SCIP_HEURTIMING class MyHeur(Heur): …
KlayHierarch
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