在Mac上安装PySCIPOpt时出错

Question

在OS上安装SCIP优化套件后，通过编译源代码并安装Cython，

make
make install INSTALLDIR="/usr/local/"
make SHARED=true GMP=false READLINE=false scipoptlib
pip install Cython

尝试安装PySCIPOpt

git clone https://github.com/SCIP-Interfaces/PySCIPOpt.git
cd PySCIPOpt
$ SCIPOPTDIR=./ python setup.py install

但这产生了一个错误。有什么建议吗？

Traceback (most recent call last):
File "setup.py", line 29, in <module>
scipsrcdir = sorted(scipsrcdir)[-1]  # use the latest version
IndexError: list index out of range

问题导入库

成功安装pyscipopt之后，当使用

from pyscipopt.scip import Model

我得到了Library not loaded错误

  File "test.py", line 1, in <module>
    from pyscipopt import Model
  File "/Users/test/anaconda/envs/test/lib/python2.7/site-packages/pyscipopt/__init__.py", line 3, in <module>
    from pyscipopt.scip      import Model
ImportError: dlopen(/Users/test/anaconda/envs/test/lib/python2.7/site-packages/pyscipopt/scip.so, 2): Library not loaded: lib/libscipopt-3.2.1.darwin.x86_64.gnu.opt.so
  Referenced from: /Users/test/anaconda/envs/test/lib/python2.7/site-packages/pyscipopt/scip.so
  Reason: image not found

经过一番搜索，我尝试了某人的解决方案：

export DYLD_LIBRARY_PATH=/path/to/scipoptsuite-3.2.1/lib 

但是，再次运行Python会产生不同的错误Symbol not found: _history_length。

Traceback (most recent call last):
  File "test.py", line 1, in <module>
    from pyscipopt import Model
  File "/Users/test/anaconda/envs/test/lib/python2.7/site-packages/pyscipopt/__init__.py", line 3, in <module>
    from pyscipopt.scip      import Model
ImportError: dlopen(/Users/test/anaconda/envs/test/lib/python2.7/site-packages/pyscipopt/scip.so, 2): Symbol not found: _history_length
  Referenced from: /Users/test/Desktop/scipoptsuite-3.2.1/lib/libscipopt-3.2.1.darwin.x86_64.gnu.opt.so
  Expected in: flat namespace
 in /Users/test/Desktop/scipoptsuite-3.2.1/lib/libscipopt-3.2.1.darwin.x86_64.gnu.opt.so

Answer 1

设置SCIPOPTDIR环境变量时，它将查找表单${SCIPOPTDIR}/scip-*/src的目录。

您会得到该错误，因为在刚克隆的PySCIPopt.git签出中没有任何与该格式匹配的目录。您需要将该环境变量设置为安装"SCIP优化套件“的目录。

Answer 2

您需要先安装SCIP。精确地说，SCIP优化套件的共享库。然后，必须将环境变量SCIPOPTDIR设置为其根目录，而不是Python接口的目录。请仔细遵循安装文件中的说明：https://github.com/SCIP-Interfaces/PySCIPOpt/blob/master/INSTALL.md