#18946: unweighted matroid intersection using blocking flow approach
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Reporter: chaoxu | Owner:
Type: enhancement | Status: positive_review
Priority: minor | Milestone: sage-6.9
Component: matroid theory | Resolution:
Keywords: | Merged in:
Authors: Chao Xu | Reviewers: Stefan van Zwam
Report Upstream: N/A | Work issues:
Branch: u/chaoxu/faster- | Commit:
abstract-matroid-intersection | 195feb847638db2c2b1763a1283c9ef31a81fa25
Dependencies: | Stopgaps:
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Changes (by {'newvalue': u'Chao Xu', 'oldvalue': ''}):
* status: needs_review => positive_review
* reviewer: => Stefan van Zwam
* author: => Chao Xu
Comment:
I did a bunch of tests, and the output was always correct. Also, timing
tests now show a consistent speedup. It's good to go in as far as I'm
concerned!
{{{
sage: def test():
for i in xrange(1000):
M1 = Matroid(MatrixSpace(GF(7), 50, 2000).random_element())
M2 = Matroid(MatrixSpace(GF(3), 50, 2000).random_element())
X = M1.intersection(M2)
....:
sage: %time test()
CPU times: user 21min 49s, sys: 25.8 s, total: 22min 15s
Wall time: 22min 17s
sage: def test2():
for i in xrange(1000):
M1 = Matroid(MatrixSpace(GF(7), 50, 2000).random_element())
M2 = Matroid(MatrixSpace(GF(3), 50, 2000).random_element())
X = M1._intersection_unweighted(M2)
....:
sage: %time test2()
CPU times: user 11min 43s, sys: 936 ms, total: 11min 44s
Wall time: 11min 44s
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/18946#comment:9>
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