You signed in with another tab or window. Reload to refresh your session.You signed out in another tab or window. Reload to refresh your session.You switched accounts on another tab or window. Reload to refresh your session.Dismiss alert
fromcylp.cyimportCyClpSimplexfromcylp.py.pivotsimportDantzigPivot# Get the path to a sample mps filef="cylp_/input/p0033.mps"s=CyClpSimplex()
s.readMps(f) # Returns 0 if OKpivot=DantzigPivot(s) # comment this line and s.setPivotMethod(pivot) # this line, it will be OK.s.primal()
round(s.objectiveValue, 5)
But it gives the log
Coin0001I At line 15 NAME P0033
Coin0001I At line 16 ROWS
Coin0001I At line 34 COLUMNS
Coin0001I At line 109 RHS
Coin0001I At line 118 BOUNDS
Coin0001I At line 152 ENDATA
Coin0002I Problem P0033 has 16 rows, 33 columns and 98 elements
Clp0027I Model was imported from cylp_/input/p0033.mps in 0.000132 seconds
Clp0006I 0 Obj 0 Primal inf 18.492499 (10) Dual inf 5.5987499e+11 (32)
Process finished with exit code 139 (interrupted by signal 11: SIGSEGV)
However, if I comment the code which changes pivoting rules, the result is fine.
I have tried to change my python version in 3.7-3.9 and Cylp 0.91.4-0.91.5 and all other pivoting rules, but all of them gives the same result.
You might take a look at #105 . I spent a good amount of time trying to run this down. The bug was introduced when trying to fix a memory leak and undoing that fix makes this bug go away, but that is not a long-term fix. It's not clear to me what the right fix is, but you can have a look at the situation. I assume this is what you're running into.
I'm trying to run the example
But it gives the log
However, if I comment the code which changes pivoting rules, the result is fine.
I have tried to change my python version in
3.7-3.9
and Cylp0.91.4-0.91.5
and all other pivoting rules, but all of them gives the same result.Here is my environment:
# Name Version Build Channel _libgcc_mutex 0.1 conda_forge conda-forge _openmp_mutex 4.5 2_gnu conda-forge bzip2 1.0.8 h7f98852_4 conda-forge ca-certificates 2022.12.7 ha878542_0 conda-forge coin-or-cbc 2.10.8 h3786ebc_0 conda-forge coin-or-cgl 0.60.6 h6f57e76_2 conda-forge coin-or-clp 1.17.7 hc56784d_2 conda-forge coin-or-osi 0.108.7 h2720bb7_2 conda-forge coin-or-utils 2.11.6 h202d8b1_2 conda-forge cylp 0.91.5 pypi_0 pypi cython 0.29.32 py37hd23a5d3_0 conda-forge ld_impl_linux-64 2.40 h41732ed_0 conda-forge libblas 3.9.0 16_linux64_openblas conda-forge libcblas 3.9.0 16_linux64_openblas conda-forge libffi 3.4.2 h7f98852_5 conda-forge libgcc-ng 12.2.0 h65d4601_19 conda-forge libgfortran-ng 12.2.0 h69a702a_19 conda-forge libgfortran5 12.2.0 h337968e_19 conda-forge libgomp 12.2.0 h65d4601_19 conda-forge liblapack 3.9.0 16_linux64_openblas conda-forge liblapacke 3.9.0 16_linux64_openblas conda-forge libnsl 2.0.0 h7f98852_0 conda-forge libopenblas 0.3.21 pthreads_h78a6416_3 conda-forge libsqlite 3.40.0 h753d276_0 conda-forge libstdcxx-ng 12.2.0 h46fd767_19 conda-forge libzlib 1.2.13 h166bdaf_4 conda-forge ncurses 6.3 h27087fc_1 conda-forge numpy 1.21.6 py37h976b520_0 conda-forge openssl 3.1.0 h0b41bf4_0 conda-forge pip 23.0.1 pyhd8ed1ab_0 conda-forge pkg-config 0.29.2 h36c2ea0_1008 conda-forge python 3.7.12 hf930737_100_cpython conda-forge python_abi 3.7 3_cp37m conda-forge readline 8.2 h8228510_1 conda-forge scipy 1.7.3 py37hf2a6cf1_0 conda-forge setuptools 67.6.1 pyhd8ed1ab_0 conda-forge sqlite 3.40.0 h4ff8645_0 conda-forge tk 8.6.12 h27826a3_0 conda-forge wheel 0.40.0 pyhd8ed1ab_0 conda-forge xz 5.2.6 h166bdaf_0 conda-forge
My OS is:
Ubuntu 22.04.2 LTS
The text was updated successfully, but these errors were encountered: