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there is an inbuilt preprocessing in CBC solver , which affects the optimality of my solution , I get the optimal output by turning this off in command prompt . How do I turn this off using pulp ?

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  • $\begingroup$ See my comment on anjikum's answer $\endgroup$
    – Milind R
    Sep 22 at 18:47

1 Answer 1

Reset to default
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You can use presolve parameter and can pass it to solver(CBC) using following statement (model is your problem object)

model.solve(pulp.PULP_CBC_CMD(presolve=False))
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    $\begingroup$ coin-or.github.io/pulp/technical/solvers.html $\endgroup$
    – Kuifje
    Apr 22, 2022 at 11:43
  • $\begingroup$ This did not work for me. The presolve is still being conducted, and it led my LP to be 'infeasible.' $\endgroup$
    – ghjk
    Jul 11 at 20:36
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    $\begingroup$ @ghjk Use presolve=off $\endgroup$
    – Milind R
    Sep 22 at 18:47

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