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35 lines
1.1 KiB
35 lines
1.1 KiB
# MIPLearn: Extensible Framework for Learning-Enhanced Mixed-Integer Optimization
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# Copyright (C) 2020, UChicago Argonne, LLC. All rights reserved.
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# Released under the modified BSD license. See COPYING.md for more details.
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from inspect import isclass
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from miplearn import BasePyomoSolver, GurobiSolver, GurobiPyomoSolver
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from miplearn.problems.knapsack import KnapsackInstance, GurobiKnapsackInstance
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def _get_instance(solver):
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def _is_subclass_or_instance(solver, parentClass):
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return isinstance(solver, parentClass) or (
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isclass(solver) and issubclass(solver, parentClass)
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)
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if _is_subclass_or_instance(solver, BasePyomoSolver):
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return KnapsackInstance(
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weights=[23.0, 26.0, 20.0, 18.0],
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prices=[505.0, 352.0, 458.0, 220.0],
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capacity=67.0,
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)
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if _is_subclass_or_instance(solver, GurobiSolver):
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return GurobiKnapsackInstance(
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weights=[23.0, 26.0, 20.0, 18.0],
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prices=[505.0, 352.0, 458.0, 220.0],
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capacity=67.0,
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)
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assert False
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def _get_internal_solvers():
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return [GurobiPyomoSolver, GurobiSolver]
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