#11559: Speed up Posets and toric Chow group
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Reporter: vbraun | Owner:
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-5.13
Component: algebraic geometry | Resolution:
Keywords: toric, sd40.5 | Merged in:
Authors: Volker Braun | Reviewers: Andrey
Report Upstream: N/A | Novoseltsev
Branch: | Work issues:
Dependencies: #11558, #10998, #13023 | Commit:
| Stopgaps:
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Old description:
> To my surprise, computing the Chow group spends most of the time
> comparing cones instead of doing linear algebra. 3/4 of the time is spent
> in `PosetElement.__eq__()`:
> {{{
> return self.parent() == other.parent() \
> and self.element == other.element \
> and self.vertex == other.vertex
> }}}
> Reordering this to first compare `self.vertex == other.vertex` speeds it
> up dramatically.
>
> Patch has some other fixes. Changes the chow group to use sparse
> matrices.
>
> Apply:
>
> - [attachment:trac_11559_fix_Chow_group.2.patch]
> - [attachment:trac_11559_hasattr_vertex_fc.patch]
New description:
To my surprise, computing the Chow group spends most of the time comparing
cones instead of doing linear algebra. 3/4 of the time is spent in
`PosetElement.__eq__()`:
{{{
return self.parent() == other.parent() \
and self.element == other.element \
and self.vertex == other.vertex
}}}
Reordering this to first compare `self.vertex == other.vertex` speeds it
up dramatically.
Patch has some other fixes. Changes the chow group to use sparse matrices.
Apply:
- [attachment:trac_11559_fix_Chow_group.2.patch]
- [attachment:trac_11559_fixdoctest.patch]
- [attachment:trac_11559_hasattr_vertex_fc.patch]
--
Comment (by chapoton):
here a patch correcting the failing doctests
Apply trac_11559_fix_Chow_group.2.patch trac_11559_fixdoctest.patch
trac_11559_hasattr_vertex_fc.patch
--
Ticket URL: <http://trac.sagemath.org/ticket/11559#comment:18>
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