I want to use the CyLP package (https://github.com/coin-or/CyLP).
My OS is macOS Big Sur 11.5.1. I am using Python 3.8.8 via anaconda3.
Following the instructions in the README, I first installed cbc via homebrew. As it did not function with brew install coin-or-tools/coinor/cbc I installed it using brew install cbc. Then I installed CyLP itself via pip install cylp.
The installation succeeded. CyLP is installed in the directory /opt/homebrew/anaconda3/lib/python3.8/site-packages/cylp. However, now if I try the unittests python -m unittest discover in the CyLP directory, it gives me the error attached below.
The mentioned files are in the directory, so I do not know how to fix that. Can anybody help me?
ERROR: cy (unittest.loader._FailedTest)
----------------------------------------------------------------------
ImportError: Failed to import test module: cy
Traceback (most recent call last):
File "/opt/homebrew/anaconda3/lib/python3.8/unittest/loader.py", line 470, in _find_test_path
package = self._get_module_from_name(name)
File "/opt/homebrew/anaconda3/lib/python3.8/unittest/loader.py", line 377, in _get_module_from_name
__import__(name)
File "/opt/homebrew/anaconda3/lib/python3.8/site-packages/cylp/cy/__init__.py", line 1, in <module>
from .CyCoinIndexedVector import CyCoinIndexedVector
ImportError: dlopen(/opt/homebrew/anaconda3/lib/python3.8/site-packages/cylp/cy/CyCoinIndexedVector.cpython-38-darwin.so, 2): Symbol not found: __ZN9CoinError12printErrors_E
Referenced from: /opt/homebrew/anaconda3/lib/python3.8/site-packages/cylp/cy/CyCoinIndexedVector.cpython-38-darwin.so
Expected in: flat namespace
in /opt/homebrew/anaconda3/lib/python3.8/site-packages/cylp/cy/CyCoinIndexedVector.cpython-38-darwin.so
======================================================================
ERROR: py (unittest.loader._FailedTest)
----------------------------------------------------------------------
ImportError: Failed to import test module: py
Traceback (most recent call last):
File "/opt/homebrew/anaconda3/lib/python3.8/unittest/loader.py", line 470, in _find_test_path
package = self._get_module_from_name(name)
File "/opt/homebrew/anaconda3/lib/python3.8/unittest/loader.py", line 377, in _get_module_from_name
__import__(name)
File "/opt/homebrew/anaconda3/lib/python3.8/site-packages/cylp/py/__init__.py", line 1, in <module>
from . import pivots
File "/opt/homebrew/anaconda3/lib/python3.8/site-packages/cylp/py/pivots/__init__.py", line 3, in <module>
from .PositiveEdgePivot import PositiveEdgePivot
File "/opt/homebrew/anaconda3/lib/python3.8/site-packages/cylp/py/pivots/PositiveEdgePivot.py", line 9, in <module>
from cylp.cy import CyCoinIndexedVector
File "/opt/homebrew/anaconda3/lib/python3.8/site-packages/cylp/cy/__init__.py", line 1, in <module>
from .CyCoinIndexedVector import CyCoinIndexedVector
ImportError: dlopen(/opt/homebrew/anaconda3/lib/python3.8/site-packages/cylp/cy/CyCoinIndexedVector.cpython-38-darwin.so, 2): Symbol not found: __ZN9CoinError12printErrors_E
Referenced from: /opt/homebrew/anaconda3/lib/python3.8/site-packages/cylp/cy/CyCoinIndexedVector.cpython-38-darwin.so
Expected in: flat namespace
in /opt/homebrew/anaconda3/lib/python3.8/site-packages/cylp/cy/CyCoinIndexedVector.cpython-38-darwin.so
----------------------------------------------------------------------
Ran 2 tests in 0.000s
UPDATE 12.09.21 It still does not work, but I made progress.
First, I tried to install CBC correctly. I recognized the issue, so I installed CBC and all its dependencies from source. When I finished, I still could not install cylp with pip install cylp. Even after setting COIN_INSTALL_DIR to my installation directory, it showed error related to my architecture, what was there x86. I realized I had been trying everything on anaconda 3.8, so I changed to python 3.9. Next, I cloned the repository of cylp and install it manually with pip3 install.
Now it displayed my architecture and did not ignore .dylib files anymore.
But now I get this error:
cylp/cpp/ICbcModel.cpp:35:9: error: no matching function for call to 'CbcMain0'
CbcMain0(*this);
^~~~~~~~
/Users/usr1/dist/include/coin/CbcSolver.hpp:310:6: note: candidate function not viable: requires 2 arguments, but 1 was provided
void CbcMain0(CbcModel &babSolver, CbcSolverUsefulData &solverData);
^
cylp/cpp/ICbcModel.cpp:37:16: error: no matching function for call to 'CbcMain1'
return CbcMain1(3, argv, *this);
^~~~~~~~
/Users/usr1/dist/include/coin/CbcSolver.hpp:314:5: note: candidate function not viable: requires 4 arguments, but 3 were provided
int CbcMain1(int argc, const char *argv[], CbcModel &babSolver,
^
/Users/usr1/dist/include/coin/CbcSolver.hpp:312:5: note: candidate function not viable: requires 5 arguments, but 3 were provided
int CbcMain1(int argc, const char *argv[], CbcModel &babSolver, int(CbcModel *currentSolver, int whereFrom), CbcSolverUsefulData &solverData);
^
2 errors generated.
error: command '/usr/bin/clang' failed with exit code 1
----------------------------------------
ERROR: Failed building wheel for cylp........
2nd UPDATE 12.09.21
I think I solved the issue.
I still get this error:
m.addConstraint(A * x == b)
EEClp6001E Unable to open file /opt/homebrew/lib/python3.9/site-packages/cylp/py/modeling/../../input/p0033.mps for reading
Clp3002W Empty problem - 0 rows, 3 columns and 0 elements
Clp0000I Optimal - objective value 0
E.Clp6001E Unable to open file /opt/homebrew/lib/python3.9/site-packages/cylp/py/../input/netlib/adlittle.mps for reading
zsh: segmentation fault python3 -m unittest discover
But the first one is probably ignorable, and the second one is just a product of the non-existence of two files in the GitHub Repository.
So I tried to write a own example code, and it worked all fine so far.
In the last step to fix the errors occurring I inserted in ICbcModel.cpp an instance of CbcSolverUsefulData to give to CbcMain0 and CbcMain1.
I hope that if somebody has the same problem, this post will help them.