PuLP Interface

[zepedropaulos]

Having some issues defining the gapRel/mip_abs_gap option with the PuLP integration. The PuLP documentation states that HiGHS_CMD implementation should have the gapRel parameter, but the HiGHS_CMD function does not accept it. HiGHS documentation states that it can be configured via options and mip_abs_gap parameter. However, I'm not able to add this option in my code. Alread tried:

milp.setSolver(HiGHS_CMD(msg=True, timeLimit=100, options=['mip_abs_gap=0.001'], path=highs_path))
milp.setSolver(HiGHS_CMD(msg=True, timeLimit=100, options='mip_abs_gap=0.001', path=highs_path))
milp.setSolver(HiGHS_CMD(msg=True, timeLimit=100, mip_abs_gap=0.001, path=highs_path))
milp.setSolver(HiGHS_CMD(msg=True, timeLimit=100, gapRel=0.001, path=highs_path))

But everything returns an error. How am I supposed to enter the options?

[jajhall]

Sorry, I don't know, as this is a PuLP issue, not a HiGHS issue. I say this because PuLP parses the options and then sets corresponding options for a particular solver. For example, timeLimit isn't a HiGHS option: we have time_limit.

Note that HiGHS has both mip_abs_gap and mip_rel_gap.