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Add testcases to force big values for dual/slack

This commit is contained in:
Joris van Rantwijk 2024-07-26 19:41:57 +02:00
parent c731c32473
commit 4670cf1dca
1 changed files with 54 additions and 0 deletions
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54
python/tests/test_algorithm.py
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@ -574,6 +574,60 @@ class TestVerificationFail(unittest.TestCase):
verify_optimum(ctx) verify_optimum(ctx)
class TestValueRange(unittest.TestCase):
"""Test graphs that force big values for dual variables or edge slack."""
def test_big_blossom_dual(self):
"""Force modified blossom dual close to 2*maxweight."""
#
# [3]
# / \
# W-4/ \W
# 7 / \
# [1]-----[2]-----[4]
# | W-4
# 5|
# | 1
# [5]-----[6]
#
w = 100000
pairs = mwm([(1,2,7), (2,3,w-4), (2,4,w-4), (2,5,5), (3,4,w), (5,6,1)])
self.assertEqual(pairs, [(1,2), (3,4), (5,6)])
def test_negative_blossom_dual(self):
"""Force modified blossom dual close to -maxweight."""
#
# [3]
# / \
# 5/ \7
# 1 / \
# [1]-----[2]-----[4]
# | 5
# 1|
# | W
# [5]-----[6]
#
w = 100000
pairs = mwm([(1,2,1), (2,3,5), (2,4,5), (2,5,1), (3,4,7), (5,6,w)])
self.assertEqual(pairs, [(1,2), (3,4), (5,6)])
def test_big_edge_slack(self):
"""Force modified edge slack close to 3*maxweight."""
#
# 6 W W-2 5
# [1]-----[2]-----[3]-----[4]-----[5]
# | |
# |1 |1
# | |
# [6]-----[7]-----[8]-----[9]-----[10]
# 6 W W-2 5
#
w = 100000
pairs = mwm([(1,2,6), (1,6,1), (2,3,w), (3,4,w-2), (3,8,1), (4,5,5),
(6,7,6), (7,8,w), (8,9,w-2), (9,10,5)])
self.assertEqual(pairs, [(1,6), (2,3), (4,5), (7,8), (9,10)])
if __name__ == "__main__": if __name__ == "__main__":
unittest.main() unittest.main()