#6102: cohomology ring of simplicial complexes
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Reporter: bantieau | Owner: bantieau
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.4
Component: algebraic | Resolution:
topology | Merged in:
Keywords: | Reviewers:
Authors: John Palmieri | Work issues:
Report Upstream: N/A | Commit:
Branch: u/jhpalmieri/AT- | e7f83d09ccd5aea84741886c905a541398a9405c
model | Stopgaps:
Dependencies: #19179 |
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Comment (by jhpalmieri):
My current plan is indeed to use both methods. By using your `%lprun`
analysis (and mine, too), I have managed to speed up both the old and new
methods. Over finite fields, the ''old'' method is now about 20 times
faster than it used to be: on one machine, computing
`algebraic_topological_model(RP3, GF(2))` used to take over 400 ms, and
now takes about 20 ms, and similarly over other prime fields. Over the
rationals, it used to take about 700 ms, and now takes just under 300. The
new method is now faster than it used to be, but slower over all fields
(about 200 ms over `GF(2)`, 1500 ms over `QQ`).
So the plan is to include both and use the old one for cubical and
simplicial complexes, the new one only for Delta complexes. I want to
figure out if I can actually implement the cup product for Delta complexes
without rewriting the whole class of complexes, providing an actual class
for its cells. I will try to update the branch soon in any case.
--
Ticket URL: <http://trac.sagemath.org/ticket/6102#comment:28>
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