PYOMO：如何使用 glpk 创建求解器

Question

I try to create a solver for a MILP-problem using PYOMO and glpk. I try

import pyomo.environ as pyo

opt = pyo.SolverFactory('glpk')

just as described in the PYOMO documentation .

However, this just gets me a warning:

WARNING: Failed to create solver with name 'glpk': Command
    '['C:\\Users\\andre\\anaconda3\\Library\\bin\\glpsol.exe', '--version']'
    timed out after 1 seconds

I have both PYOMO and glpk installed using conda install

And I can call glpsol from the command line - which should indicate everything is alright (see here ).

Versions :

glpk: 5.0

pyomo: 6.0.1

python: 3.8.5

windows: windows 10 pro 21H1

Any ideas how to solve this?

Answer 1

SOLUTION:

I have found something similar in the pyomo github issue 2102 . I have adopted the mentioned monkey-patch approach and it actually worked:

import subprocess

def patched_subprocess_run(*args, **kwargs):
    if kwargs.get("timeout") is not None:
        kwargs["timeout"] = 5
    return orig_subprocess_run(*args, **kwargs)

orig_subprocess_run = subprocess.run
subprocess.run = patched_subprocess_run

# Your Pyomo call here.

So setting the timeout to 5 seconds works for me.