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Implement iteration_cb for LearningSolver; reactivate TSP

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Alinson S. Xavier
2020-09-23 17:46:18 -05:00
parent 5390a5b656
commit e527e75481
8 changed files with 91 additions and 60 deletions
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12
miplearn/components/lazy_dynamic.py
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@@ -38,6 +38,18 @@ class DynamicLazyConstraintsComponent(Component):
cut = instance.build_lazy_constraint(model, v)
solver.internal_solver.add_constraint(cut)
def after_iteration(self, solver, instance, model):
logger.debug("Finding violated (dynamic) lazy constraints...")
violations = instance.find_violated_lazy_constraints(model)
if len(violations) == 0:
return False
instance.found_violated_lazy_constraints += violations
logger.debug(" %d violations found" % len(violations))
for v in violations:
cut = instance.build_lazy_constraint(model, v)
solver.internal_solver.add_constraint(cut)
return True
def after_solve(self, solver, instance, model, results):
pass