#10549: Improvements in canonical_form, is_isomorphic, and
graph_isom_equivalent_non_edge_labeled_graph
-------------------------------+--------------------------------------------
Reporter: stumpc5 | Owner: jason, ncohen, rlm
Type: enhancement | Status: needs_work
Priority: major | Milestone:
Component: graph theory | Keywords: graph, canonical form,
isomorphism
Author: Christian Stump | Upstream: N/A
Reviewer: Robert Miller | Merged:
Work_issues: |
-------------------------------+--------------------------------------------
Changes (by ncohen):
* status: needs_review => needs_work
Comment:
Hellooooooo !!
Only two errors in a -testall -long :
{{{
#!python
sage -t -long sage-bug/sage/graphs/generic_graph.py
**********************************************************************
File "/home/ncohen/sage/devel/sage-bug/sage/graphs/generic_graph.py", line
14686:
sage: G.is_isomorphic(H, edge_labels=True)
Expected:
True
Got:
False
**********************************************************************
File "/home/ncohen/sage/devel/sage-bug/sage/graphs/generic_graph.py", line
14688:
sage: G.is_isomorphic(H, edge_labels=True, certify=True)
Expected:
{0: 1, 1: 2, 2: 3, 3: 4, 4: 0}
Got:
(False, None)
**********************************************************************
}}}
(I'm running the latest alpha1)
By the way : would you know of a "cheap/elegant" way to deal with this :
{{{
#!python
sage: g = graphs.KneserGraph(8,2)
sage: h = g.copy()
sage: %timeit g.is_isomorphic(h)
125 loops, best of 3: 6.27 ms per loop
sage: h.relabel()
sage: %timeit g.is_isomorphic(h)
125 loops, best of 3: 4.72 ms per loop
sage: g.relabel()
sage: %timeit g.is_isomorphic(h)
125 loops, best of 3: 3.13 ms per loop
}}}
Or is it just because of the way labels are handled ?
Nathann
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10549#comment:6>
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