liu heng

Thanks a lot! Can I just assume that when I call p = m.presolve(), then p and m are independent, modifications on either model will not affect the other?

This is much faster, thanks a lot!

Thank you Riley, I have tried this but there is still some issues: replace_fixings(m) spent much more time than m.presolve() (in fact my model has much more than 100 variables), I wonder if there i...

Thank you Michel, but if call reduced_model=model.presolve(), the solution of 'reduced_model' cannot be mapped back to the solution of 'model'

Because I need to try many kinds of fixations and solve the sub-MIP, but i wish to presolve the original model m only once (to save time). In fact i don't need the mapping itself, i just need the s...