How to specify which method you use in PuLP python?

Question

I'm new to optimisation and python so sorry if answer to my question is obvious.

I wanted to use Revised Simplex Method in PuLP and i read in the documentation that there is an option to specify which method the solver uses but i could not find how to do it.

link to the documentation : https://pythonhosted.org/PuLP/main/optimisation_concepts.html

Answer 1

Using the solver COIN-CBC, you can do:

 prob.solve(pulp.COIN_CMD(msg=1, options=['primalSimplex']))

or

 prob.solve(pulp.COIN_CMD(msg=1, options=['dualSimplex']))

Notes:

• You should observe somewhat different iteration counts.
• Dual simplex is the default.
• I assume you mean by "revised simplex" the primal simplex method (CBC has no full-tableau simplex so in that sense all Simplex methods in CBC are "revised").
• The interior point method can be selected with options=['barrier'] .
• For large LPs it may make sense to try out these three methods. I am not sure what these options do for MIP models (it is probably better to trust LP defaults in this case)