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Fix outer/inner bound assignment for maximization in amalgamator #837

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Merged
DLWoodruff merged 1 commit into from
Aug 18, 2026
Merged

Fix outer/inner bound assignment for maximization in amalgamator #837

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6 changes: 4 additions & 2 deletions mpisppy/utils/amalgamator.py
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Original file line number Diff line number Diff line change
Expand Up @@ -328,12 +328,14 @@ def run(self):

self.is_minimizing = objs[0].is_minimizing
#TBD : Write a function doing this
# The solver's Lower and Upper bounds bracket the optimal value, so
# which one is the outer (relaxation) bound depends on the sense.
if self.is_minimizing:
self.best_outer_bound = results.Problem[0]['Lower bound']
self.best_inner_bound = results.Problem[0]['Upper bound']
else:
self.best_inner_bound = results.Problem[0]['Upper bound']
self.best_outer_bound = results.Problem[0]['Lower bound']
self.best_outer_bound = results.Problem[0]['Upper bound']
self.best_inner_bound = results.Problem[0]['Lower bound']
self.ef = ef

if 'write_solution' in self.cfg:
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