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.
83 lines
2.4 KiB
83 lines
2.4 KiB
# MIPLearn: Extensible Framework for Learning-Enhanced Mixed-Integer Optimization
|
|
# Copyright (C) 2020-2021, UChicago Argonne, LLC. All rights reserved.
|
|
# Released under the modified BSD license. See COPYING.md for more details.
|
|
|
|
from miplearn.features import (
|
|
FeaturesExtractor,
|
|
InstanceFeatures,
|
|
Variable,
|
|
Constraint,
|
|
)
|
|
from miplearn.solvers.gurobi import GurobiSolver
|
|
from miplearn.solvers.tests import assert_equals
|
|
|
|
|
|
def test_knapsack() -> None:
|
|
solver = GurobiSolver()
|
|
instance = solver.build_test_instance_knapsack()
|
|
model = instance.to_model()
|
|
solver.set_instance(instance, model)
|
|
FeaturesExtractor(solver).extract(instance)
|
|
assert_equals(
|
|
instance.features.variables,
|
|
{
|
|
"x[0]": Variable(
|
|
category="default",
|
|
lower_bound=0.0,
|
|
obj_coeff=505.0,
|
|
type="B",
|
|
upper_bound=1.0,
|
|
user_features=[23.0, 505.0],
|
|
),
|
|
"x[1]": Variable(
|
|
category="default",
|
|
lower_bound=0.0,
|
|
obj_coeff=352.0,
|
|
type="B",
|
|
upper_bound=1.0,
|
|
user_features=[26.0, 352.0],
|
|
),
|
|
"x[2]": Variable(
|
|
category="default",
|
|
lower_bound=0.0,
|
|
obj_coeff=458.0,
|
|
type="B",
|
|
upper_bound=1.0,
|
|
user_features=[20.0, 458.0],
|
|
),
|
|
"x[3]": Variable(
|
|
category="default",
|
|
lower_bound=0.0,
|
|
obj_coeff=220.0,
|
|
type="B",
|
|
upper_bound=1.0,
|
|
user_features=[18.0, 220.0],
|
|
),
|
|
},
|
|
)
|
|
assert_equals(
|
|
instance.features.constraints,
|
|
{
|
|
"eq_capacity": Constraint(
|
|
lhs={
|
|
"x[0]": 23.0,
|
|
"x[1]": 26.0,
|
|
"x[2]": 20.0,
|
|
"x[3]": 18.0,
|
|
},
|
|
sense="<",
|
|
rhs=67.0,
|
|
lazy=False,
|
|
category="eq_capacity",
|
|
user_features=[0.0],
|
|
)
|
|
},
|
|
)
|
|
assert_equals(
|
|
instance.features.instance,
|
|
InstanceFeatures(
|
|
user_features=[67.0, 21.75],
|
|
lazy_constraint_count=0,
|
|
),
|
|
)
|