Opened 9 years ago
Closed 8 years ago
#13281 closed defect (duplicate)
gurobi backend has no copy(), and creates named constraints since v5
Reported by: | dimpase | Owned by: | ncohen |
---|---|---|---|
Priority: | major | Milestone: | sage-duplicate/invalid/wontfix |
Component: | linear programming | Keywords: | |
Cc: | ncohen | Merged in: | |
Authors: | Reviewers: | Volker Braun | |
Report Upstream: | N/A | Work issues: | |
Branch: | Commit: | ||
Dependencies: | Stopgaps: |
Description
installing Gurobi
switches the default LP solver to Gurobi
, leading to doctest failure in mip.pyx
File "/usr/local/src/sage/sage-5.2.rc0/devel/sage-main/sage/numerical/mip.pyx", line 298: sage: q = copy(p) Exception raised: Traceback (most recent call last): File "/usr/local/src/sage/sage-5.2.rc0/local/bin/ncadoctest.py", line 1231, in run_one_test self.run_one_example(test, example, filename, compileflags) File "/usr/local/src/sage/sage-5.2.rc0/local/bin/sagedoctest.py", line 38, in run_one_example OrigDocTestRunner.run_one_example(self, test, example, filename, compileflags) File "/usr/local/src/sage/sage-5.2.rc0/local/bin/ncadoctest.py", line 1172, in run_one_example compileflags, 1) in test.globs File "<doctest __main__.example_4[4]>", line 1, in <module> q = copy(p)###line 298: sage: q = copy(p) File "/usr/local/src/sage/sage-5.2.rc0/local/lib/python2.7/copy.py", line 80, in copy return copier(x) File "mip.pyx", line 320, in sage.numerical.mip.MixedIntegerLinearProgram.__copy__ (sage/numerical/mip.c:2352) p._backend = (<GenericBackend> self._backend).copy() AttributeError: 'sage.numerical.backends.gurobi_backend.GurobiBacke' object has no attribute 'copy'
And indeed, there is no copy() in gurobi backend.
Another bunch of tests that fail in a similar fashion, due to Gurobi (version 5) automatically naming constraints, and so one gets
File "/usr/local/src/sage/sage-5.2.rc0/devel/sage-main/sage/numerical/mip.pyx", line 1132: sage: p.show() Expected: Maximization: <BLANKLINE> Constraints: x_0 + x_1 <= 10.0 x_0 - x_1 <= 0.0 x_0 <= 4.0 ... Got: Maximization: <BLANKLINE> Constraints: R0: x_0 + x_1 <= 10.0 R1: x_0 - x_1 <= 0.0 R2: x_0 <= 4.0 Variables: x_0 is a continuous variable (min=0.0, max=+oo) x_1 is a continuous variable (min=0.0, max=+oo)
and other similar failures from show()
.
One particular way to fix this would be to set the solver to be GLPK
in all these tests, and create similar
optional tests for Gurobi
.
And, lastly, Gurobi version 5 on OSX 10.6 outputs [-0.0, 3.0]
rather than [0.0, 3.0]
in a doctest in gurobi_backend.pyx
.
Change History (3)
comment:1 Changed 8 years ago by
- Milestone changed from sage-5.10 to sage-duplicate/invalid/wontfix
- Status changed from new to needs_review
comment:2 Changed 8 years ago by
- Status changed from needs_review to positive_review
comment:3 Changed 8 years ago by
- Resolution set to duplicate
- Reviewers set to Volker Braun
- Status changed from positive_review to closed
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Duplicate of #12973