#13730: Speed up some graph iterations
--------------------------------+-------------------------------------------
Reporter: dcoudert | Owner: jason, ncohen, rlm
Type: enhancement | Status: needs_info
Priority: major | Milestone: sage-5.8
Component: graph theory | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: | Merged in:
Dependencies: | Stopgaps:
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Comment (by slani):
Hello.
I tried to implement what azi did. I add hash tabel and update some
methods. I didn't make other tests.
I'm new in SAGE development and I would like to work on this problem.
Please help me and tell me if this patch are going in right direction.
Best regards,
slani
{{{
new
==========================================================
sage: G = graphs.RandomBarabasiAlbert(100,2)
sage: %timeit E = [(u,v) for u in G for v in G.neighbor_iterator(u)]
625 loops, best of 3: 479 µs per loop
sage: ggnx = G.networkx_graph()
sage: %timeit EE = [(u,v) for u in ggnx for v in ggnx.neighbors_iter(u)]
625 loops, best of 3: 171 µs per loopsage: %timeit EE = [(u,v) for u in
ggnx for v in ggnx[u]]
625 loops, best of 3: 159 µs per loop
sage: %timeit G.neighbors(3)
625 loops, best of 3: 5.35 µs per loop
===========================================================
old
===========================================================
sage: G = graphs.RandomBarabasiAlbert(100,2)
sage: %timeit E = [(u,v) for u in G for v in G.neighbor_iterator(u)]
125 loops, best of 3: 2.03 ms per loop
sage: ggnx = G.networkx_graph()
sage: %timeit EE = [(u,v) for u in ggnx for v in ggnx.neighbors_iter(u)]
625 loops, best of 3: 177 µs per loop
sage: %timeit EE = [(u,v) for u in ggnx for v in ggnx[u]]
625 loops, best of 3: 159 µs per loop
%timeit G.neighbors(3)
625 loops, best of 3: 91.1 µs per loop
============================================================
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13730#comment:8>
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