CPLEX 中的 Bender 分解示例 Python

Question

[![在此处输入图像描述][1]][1]我运行宁 "bendersatsp.py" 来自 CPLEX 通过 eclips 提出的示例。我只在定义 "filename=" 的主子句中添加了 atsp.dat 的路径。在运行ning 之后，它似乎只对 len(sys.argv)=1 执行并给了我以下结果。你知道问题是什么吗？为什么不完全运行？

  Usage:     bendersatsp.py {0|1} [filename]
  0:        Benders' cuts only used as lazy constraints,
            to separate integer infeasible solutions.
  1:        Benders' cuts also used as user cuts,
            to separate fractional infeasible solutions.
  filename: ATSP instance file name.
       File C:\Program Files (x86)\IBM\ILOG\CPLEX_Studio1261\cplex\examples/data/atsp.dat used if no name is provided.

Answer 1

0|1 参数是必需的。例如，您需要运行脚本，如下所示：

python bendersatsp.py 0 "C:\Program Files (x86)\IBM\ILOG\CPLEX_Studio1261\cplex\examples/data/atsp.dat"

或者，假设您更改了默认 filename 路径：

python bendersatsp.py 0

我已经在解析下面的命令行参数的代码中添加了一些注释，以尝试阐明这一点：

if __name__ == "__main__":
    # If there are not 1 or 2 arguments then exit (recall that 
    # sys.argv[0] is the program name itself (i.e., "bendersatsp.py")
    if len(sys.argv) != 2 and len(sys.argv) != 3:
        usage()
        sys.exit(-1)
    # If the first argument is not "0" or "1" then exit.
    if sys.argv[1] not in  ["0", "1"]:
        usage()
        sys.exit(-1)
    # Store the second argument in filename if there is one.
    if len(sys.argv) == 3:
        filename = sys.argv[2]
    else:
        # Otherwise, use the following default.
        filename = "../../../examples/data/atsp.dat"
    # Pass the arguments into the bendersATSP function.
    bendersATSP(sys.argv[1][0], filename)

CPLEX 中的 Bender 分解示例 Python

Bender's decomposition example in CPLEX's Python

python

cplex

decomposition