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30 lines
736 B
30 lines
736 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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import logging
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from miplearn import Component
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logger = logging.getLogger(__name__)
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class RelaxIntegralityStep(Component):
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"""
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Component that relaxes all integrality constraints before the problem is solved.
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"""
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def before_solve(self, solver, instance, _):
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logger.info("Relaxing integrality...")
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solver.internal_solver.relax()
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def after_solve(
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self,
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solver,
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instance,
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model,
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stats,
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training_data,
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):
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return
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