#15104: Special case modn_dense matrix operations to improve performance
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Reporter: nbruin | Owner:
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-6.2
Component: linear algebra | Resolution:
Keywords: | Merged in:
Authors: Nils Bruin, Simon | Reviewers:
King | Work issues: regression in
Report Upstream: N/A | right_kernel_matrix
Branch: | Commit:
u/SimonKing/ticket/15104 | 0f008f9266e3ed6fbd67e7f3d357474825bdb160
Dependencies: | Stopgaps:
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Comment (by nthiery):
Hmm interesting; fixing a speed regression by going too much in one
direction is triggering another speed regression!
Would it make sense as a short term fix to implement now the
alternative option mentioned in the documentation of
MatrixSpace.full_category_initialisation? After all, having an object
whose category is not completely initialized is prone to issues, and
it's not unreasonable to have to ask explicitly for it when needed,
rather than the converse.
{{{
.. todo::
Add instead an optional argument to :func:`MatrixSpace` to
temporarily disable the category initialization in those
special cases where speed is critical::
sage: MS = MatrixSpace(QQ,7, init_category=False) # todo:
not implemented
sage: TestSuite(MS).run() # todo:
not implemented
Traceback (most recent call last):
...
AssertionError: category of self improperly initialized
until someone recreates explicitly the same matrix space
without that optional argument::
sage: MS = MatrixSpace(QQ,7) # todo:
not implemented
sage: TestSuite(MS).run() # todo:
not implemented
}}}
Then, for the long run, would the proper fix be to aim at using
Algebra(Fields()) (which is yet to be implemented) instead of
Algebras(K) as category?
Cheers,
Nicolas
--
Ticket URL: <http://trac.sagemath.org/ticket/15104#comment:31>
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