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我想使用 CyLP 包（https://github.com/coin-or/CyLP）。我的操作系统是 macOS Big Sur 11.5.1。我正在通过 anaconda3 使用 Python 3.8.8。按照自述文件中的说明，我首先通过自制软件安装了 cbc。由于它无法与brew install coin-or-tools/coinor/cbc我使用brew install cbc. 然后我通过pip install cylp.

安装成功。CyLP 安装在目录中/opt/homebrew/anaconda3/lib/python3.8/site-packages/cylp。但是，现在如果我尝试python -m unittest discoverCyLP 目录中的单元测试，它会给我下面附加的错误。

提到的文件在目录中，所以我不知道如何解决这个问题。有谁能够帮我？

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

更新 12.09.21 它仍然不起作用，但我取得了进展。

首先，我尝试正确安装 CBC。我认识到了这个问题，所以我从源代码安装了 CBC 及其所有依赖项。完成后，我仍然无法使用pip install cylp. 即使设置COIN_INSTALL_DIR到我的安装目录后，它也显示与我的架构相关的错误，x86 是什么。我意识到我一直在尝试 anaconda 3.8 上的所有内容，所以我改用 python 3.9。接下来，我克隆了 cylp 的存储库并使用pip3 install.

现在它显示了我的架构并且不再忽略.dylib文件。但现在我得到这个错误：

  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........

第二次更新 12.09.21

我想我解决了这个问题。

我仍然收到此错误：

  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

但是第一个可能是可以忽略的，第二个只是GitHub Repository中不存在两个文件的产物。

所以我尝试编写自己的示例代码，到目前为止一切正常。

在修复发生的错误的最后一步中，我插入ICbcModel.cpp了CbcSolverUsefulDatato give toCbcMain0和CbcMain1.

我希望如果有人有同样的问题，这篇文章会帮助他们。

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