#19178: Make Coxeter3 a new-style spkg
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Reporter: tscrim | Owner: tscrim
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.9
Component: packages: | Resolution:
optional | Merged in:
Keywords: | Reviewers:
Authors: Travis Scrimshaw | Work issues:
Report Upstream: N/A | Commit:
Branch: | 5bdccbfb4a9ad50de7e467a9f3b5c7eb2a4f3532
u/tscrim/coxeter3_new_style_spkg-19178| Stopgaps:
Dependencies: |
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Comment (by tscrim):
I couldn't resist going in and making some other improvements to the code:
{{{
sage: C = CoxeterGroup(['B', 5], implementation='coxeter3')
sage: %timeit L = [C.kazhdan_lusztig_polynomial(C.one(),w) for w in C]
1 loops, best of 3: 387 ms per loop
sage: %timeit L = [C.kazhdan_lusztig_polynomial(C.one(),w,False) for w in
C]
1 loops, best of 3: 467 ms per loop
}}}
versus previously
{{{
sage: %timeit L = [C.kazhdan_lusztig_polynomial(C.one(),w) for w in C]
1 loops, best of 3: 772 ms per loop
sage: %timeit L = [C.kazhdan_lusztig_polynomial(C.one(),w,False) for w in
C]
1 loops, best of 3: 857 ms per loop
}}}
In summary, I got a ~2x speedup from not converting to a string as an
intermediate object (but I'm probably taking advantage of recent upgrades
in cython to do so). I also avoiding creating things in the fraction field
for the non-constant coefficient KL polynomials. There were some other
micro-optimizations and things I changed for better practices.
--
Ticket URL: <http://trac.sagemath.org/ticket/19178#comment:11>
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