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I want to solve a problem with docplex.cp (module for Constraint Programming optimizer CPLEX for Python), and the problem is available in .lp or .mps formats. But I did not find the attribute for reading a file in it.

For the CPLEX itself, utilizing the cplex module it can be done as following:

import cplex

Model = cplex.Cplex("MyProblem.lp")
Model.solve()

But for the docplex module I tried to use import_model as following:

from docplex.cp.model import CpoModel

m = CpoModel()
Model = CpoModel.import_model(m,"MyProblem.lp")
Model.solve()

But it is not working as import_model only supports .cpo and .fzn formats.

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    $\begingroup$ have you tried using other functions from docplex? Like the docplex.mp? Maybe this helps: ibmdecisionoptimization.github.io/docplex-doc/mp/… $\endgroup$
    – JakobS
    Commented Aug 1, 2019 at 10:18
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    $\begingroup$ And in the "next topic" section of the link above that @JakobS shared you can find model_reader module $\endgroup$
    – EhsanK ♦
    Commented Aug 1, 2019 at 12:23
  • $\begingroup$ Thanks for suggestions. I need to solve with the Constraint Programming optimizer, so I guess "docplex.cp" is the right module. Am I right that "docplex.mp" is equivalent to using "cplex" module? $\endgroup$
    – Mostafa
    Commented Aug 1, 2019 at 13:41
  • $\begingroup$ That is right you need to use "DOcplex.cp" but more information can be found in the link: "ibmdecisionoptimization.github.io/docplex-doc/cp/index.html" $\endgroup$
    – Oguz Toragay
    Commented Aug 1, 2019 at 14:03
  • $\begingroup$ @OguzToragay Yeah, and there is no function to read .lp or .mps files. $\endgroup$
    – Mostafa
    Commented Aug 12, 2019 at 5:44

1 Answer 1

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Thank you for using docplex. Currently, docplex.cp can import only .cpo and .mzn files. Maybe this could be extended in the next future.

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