#12607: ChainComplex reports zero homology groups (depending on ChomP)
-------------------------------------+-------------------------------------
Reporter: vbraun | Owner: jhpalmieri
Type: defect | Status: needs_review
Priority: major | Milestone: sage-6.9
Component: algebraic | Resolution:
topology | Merged in:
Keywords: chomp | Reviewers:
Authors: Frédéric Chapoton | Work issues:
Report Upstream: N/A | Commit:
Branch: u/chapoton/12607 | 5b75dfe33aa8ed5c723492ac6761422332da9560
Dependencies: | Stopgaps:
-------------------------------------+-------------------------------------
Comment (by jhpalmieri):
If I install CHomP, I get one doctest failure:
{{{
sage -t --long --warn-long 51.8 src/sage/homology/delta_complex.py
**********************************************************************
File "src/sage/homology/delta_complex.py", line 605, in
sage.homology.delta_complex.DeltaComplex.chain_complex
Failed example:
T.homology(subcomplex=T)
Exception raised:
Traceback (most recent call last):
File
"/Users/palmieri/Desktop/Sage_stuff/sage_builds/CHOMP/sage-6.8/local/lib/python2.7
/site-packages/sage/doctest/forker.py", line 496, in _run
self.compile_and_execute(example, compiler, test.globs)
File
"/Users/palmieri/Desktop/Sage_stuff/sage_builds/CHOMP/sage-6.8/local/lib/python2.7
/site-packages/sage/doctest/forker.py", line 858, in compile_and_execute
exec(compiled, globs)
File "<doctest
sage.homology.delta_complex.DeltaComplex.chain_complex[8]>", line 1, in
<module>
T.homology(subcomplex=T)
File
"/Users/palmieri/Desktop/Sage_stuff/sage_builds/CHOMP/sage-6.8/local/lib/python2.7
/site-packages/sage/homology/cell_complex.py", line 541, in homology
answer = C.homology(**kwds)
File
"/Users/palmieri/Desktop/Sage_stuff/sage_builds/CHOMP/sage-6.8/local/lib/python2.7
/site-packages/sage/misc/decorators.py", line 705, in wrapper
return func(*args, **kwds)
File
"/Users/palmieri/Desktop/Sage_stuff/sage_builds/CHOMP/sage-6.8/local/lib/python2.7
/site-packages/sage/homology/chain_complex.py", line 1213, in homology
return self._homology_chomp(deg, base_ring, verbose, generators)
File
"/Users/palmieri/Desktop/Sage_stuff/sage_builds/CHOMP/sage-6.8/local/lib/python2.7
/site-packages/sage/homology/chain_complex.py", line 1054, in
_homology_chomp
generators=generators)
File
"/Users/palmieri/Desktop/Sage_stuff/sage_builds/CHOMP/sage-6.8/local/lib/python2.7
/site-packages/sage/interfaces/chomp.py", line 590, in homchain
return CHomP()('homchain', complex, **kwds)
File
"/Users/palmieri/Desktop/Sage_stuff/sage_builds/CHOMP/sage-6.8/local/lib/python2.7
/site-packages/sage/interfaces/chomp.py", line 263, in __call__
raise RuntimeError('error inside CHomP')
RuntimeError: error inside CHomP
**********************************************************************
1 item had failures:
1 of 13 in sage.homology.delta_complex.DeltaComplex.chain_complex
[145 tests, 1 failure, 1.31 s]
}}}
If I then run tests with `--optional=sage,chomp`, I get a few more errors:
{{{
sage -t --long --warn-long 51.8 src/sage/homology/tests.py
**********************************************************************
File "src/sage/homology/tests.py", line 10, in sage.homology.tests
Failed example:
test_random_chain_complex(trials=20) # optional - CHomP
Expected nothing
Got:
Random testing has revealed a problem in test_random_chain_complex
Please report this bug! You may be the first
person in the world to have seen this problem.
Please include this random seed in your bug report:
Random seed: 159304674290093254409624536430227373862
RuntimeError('error inside CHomP',)
**********************************************************************
File "src/sage/homology/tests.py", line 11, in sage.homology.tests
Failed example:
test_random_chain_complex(level=2, trials=20) # optional - CHomP
Expected nothing
Got:
Random testing has revealed a problem in test_random_chain_complex
Please report this bug! You may be the first
person in the world to have seen this problem.
Please include this random seed in your bug report:
Random seed: 130448957777511520486902617862493201212
RuntimeError('error inside CHomP',)
**********************************************************************
File "src/sage/homology/tests.py", line 12, in sage.homology.tests
Failed example:
test_random_chain_complex(level=3, trials=20) # long time # optional
- CHomP
Expected nothing
Got:
Random testing has revealed a problem in test_random_chain_complex
Please report this bug! You may be the first
person in the world to have seen this problem.
Please include this random seed in your bug report:
Random seed: 337572972161276702442755420588198438138
RuntimeError('error inside CHomP',)
**********************************************************************
File "src/sage/homology/tests.py", line 72, in
sage.homology.tests.test_random_chain_complex
Failed example:
test_random_chain_complex(trials=2) # optional - CHomP
Expected nothing
Got:
Random testing has revealed a problem in test_random_chain_complex
Please report this bug! You may be the first
person in the world to have seen this problem.
Please include this random seed in your bug report:
Random seed: 190504759948336957776305453124739057674
RuntimeError('error inside CHomP',)
**********************************************************************
2 items had failures:
3 of 9 in sage.homology.tests
1 of 3 in sage.homology.tests.test_random_chain_complex
[20 tests, 4 failures, 2.40 s]
}}}
We need to fix the failures in `delta_complex.py`. It would be nice to fix
the ones in `tests.py`, but that could be done on another ticket. (This is
on OS X, for what that's worth.)
--
Ticket URL: <http://trac.sagemath.org/ticket/12607#comment:13>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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