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27 lines
903 B
27 lines
903 B
# 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 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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if issubclass(solver, BasePyomoSolver):
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return KnapsackInstance(
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weights=[23., 26., 20., 18.],
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prices=[505., 352., 458., 220.],
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capacity=67.,
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)
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if issubclass(solver, GurobiSolver):
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return GurobiKnapsackInstance(
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weights=[23., 26., 20., 18.],
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prices=[505., 352., 458., 220.],
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capacity=67.,
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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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