#14214: Cythoned homsets
----------------------------------------------+-----------------------------
Reporter: SimonKing | Owner: tbd
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-5.10
Component: performance | Resolution:
Keywords: Hom, cython, cached method | Work issues: How to store
domain and codomain?
Report Upstream: N/A | Reviewers:
Authors: Simon King | Merged in:
Dependencies: #14159, #12951, #13184 | Stopgaps:
----------------------------------------------+-----------------------------
Comment (by nbruin):
A very rough implementation:
{{{
from sage.misc.lazy_attribute import lazy_attribute
cdef class LazyAttribute:
cdef public f
cdef public str __name__
def __init__(self,f):
self.f=f
self.__name__=f.__name__
def __get__(self,instance,cls):
if instance is None:
return lazy_attribute(self.f)
v=self.f(instance)
setattr(instance,self.__name__,v)
return v
}}}
Note I'm just reusing the old `lazy_attribute` here to deal with
documentation issues.
{{{
sage: class T(object):
... @LazyAttribute
... def t(self):
... """docstring of f"""
... return 1000
... @lazy_attribute
... def s(self):
... """docstring of f"""
... return 1000
sage: timeit("T().t",repeat=10,number=10000)
10000 loops, best of 10: 374 ns per loop
sage: timeit("T().s",repeat=10,number=10000)
10000 loops, best of 10: 2.93 µs per loop
}}}
If I just copy over the `__get__` method from the original
`lazy_attribute` the difference is a little less pronounced, because that
code does a lot more. After changing `self.f.__name__` to `self.__name__`
I'm getting `1.2 µs`, so that still more than twice as fast.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14214#comment:50>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
--
You received this message because you are subscribed to the Google Groups
"sage-trac" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
Visit this group at http://groups.google.com/group/sage-trac?hl=en.
For more options, visit https://groups.google.com/groups/opt_out.
