You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
36 lines
1.2 KiB
36 lines
1.2 KiB
# MIPLearn: Extensible Framework for Learning-Enhanced Mixed-Integer Optimization
|
|
# Copyright (C) 2020, UChicago Argonne, LLC. All rights reserved.
|
|
# Released under the modified BSD license. See COPYING.md for more details.
|
|
|
|
from inspect import isclass
|
|
from miplearn import BasePyomoSolver, GurobiSolver, GurobiPyomoSolver
|
|
from miplearn.problems.knapsack import KnapsackInstance, GurobiKnapsackInstance
|
|
from miplearn.solvers.pyomo.xpress import XpressPyomoSolver
|
|
|
|
|
|
def _get_instance(solver):
|
|
def _is_subclass_or_instance(solver, parentClass):
|
|
return isinstance(solver, parentClass) or (
|
|
isclass(solver) and issubclass(solver, parentClass)
|
|
)
|
|
|
|
if _is_subclass_or_instance(solver, BasePyomoSolver):
|
|
return KnapsackInstance(
|
|
weights=[23.0, 26.0, 20.0, 18.0],
|
|
prices=[505.0, 352.0, 458.0, 220.0],
|
|
capacity=67.0,
|
|
)
|
|
|
|
if _is_subclass_or_instance(solver, GurobiSolver):
|
|
return GurobiKnapsackInstance(
|
|
weights=[23.0, 26.0, 20.0, 18.0],
|
|
prices=[505.0, 352.0, 458.0, 220.0],
|
|
capacity=67.0,
|
|
)
|
|
|
|
assert False
|
|
|
|
|
|
def _get_internal_solvers():
|
|
return [GurobiPyomoSolver, GurobiSolver, XpressPyomoSolver]
|