#14711: Weak references in the coercion graph
-------------------------------------+-------------------------------------
Reporter: jpflori | Owner: davidloeffler
Type: defect | Status: needs_work
Priority: critical | Milestone: sage-6.0
Component: number fields | Resolution:
Keywords: memleak, number | Merged in:
field, QuadraticField | Reviewers:
Authors: Simon King | Work issues: Fix doctests errors
Report Upstream: N/A | after merging master
Branch: | Commit:
u/SimonKing/ticket/14711 | d68c5df4618cc4fcf8ef215ee6b2f475be028209
Dependencies: | Stopgaps:
-------------------------------------+-------------------------------------
Changes (by SimonKing):
* status: needs_review => needs_work
Comment:
The new commit fixes some trivial errors (some people were still using
`._domain` and were still not copying coerce maps when exposing them to
the outside world).
However, this will be a tough one:
{{{
sage -t src/sage/schemes/projective/projective_morphism.py
**********************************************************************
File "src/sage/schemes/projective/projective_morphism.py", line 1326, in
sage.schemes.projective.projective_morphism.SchemeMorphism_polynomial_projective_space.canonical_height
Failed example:
f.canonical_height(Q,badprimes=[2])
Expected:
0.0013538030870311431824555314882
Got:
verbose 0 (3533: multi_polynomial_ideal.py, groebner_basis) Warning:
falling back to very slow toy implementation.
verbose 0 (3533: multi_polynomial_ideal.py, groebner_basis) Warning:
falling back to very slow toy implementation.
0.0013538030870311431824555314882
**********************************************************************
1 item had failures:
1 of 16 in
sage.schemes.projective.projective_morphism.SchemeMorphism_polynomial_projective_space.canonical_height
[481 tests, 1 failure, 8.63 s]
----------------------------------------------------------------------
sage -t src/sage/schemes/projective/projective_morphism.py # 1 doctest
failed
----------------------------------------------------------------------
Total time for all tests: 8.9 seconds
cpu time: 7.7 seconds
cumulative wall time: 8.6 seconds
}}}
Somehow, the use of a weakened coerce map makes the Gröbner machinery use
a slow toy implementation `:-/`
--
Ticket URL: <http://trac.sagemath.org/ticket/14711#comment:147>
Sage <http://www.sagemath.org>
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