Julian Hall
This is related to #1857 raised by @thell Hello! Consider the following options being passed to HiGHS: "mip_improving_solution_save=on", "mip_improving_solution_file=highs_improved_solution_{max_cost}_c.sol", I can see that they are being accepted because a highs_improved_solution...
> Hello again. This issue is fairly scary in that I, and assumably everyone else, expects that the Best Bounds are going to always be truthful. It's a reasonable assumption,...
> Ok on the closure, but it literally took 8.7 seconds to see the error in the log so I don't think the time to investigate is either tied to...
This is a relative difference of 0.03, so well outside anything that could be explained by the relative MIP gap tolerance in HiGHS.
You've generated a remarkable number of issues recently. What proportion of your instances do they represent?
Probably the same issue. What do you think, @fwesselm?
Interesting: perhaps it's not properly centred. @filikat added proper centring to IPX a while ago, so maybe we should try that for this instance. The proper centring code should always...
Presolve won't be used for the centring calculation. Indeed, we should ensure that any setting of presolve=choose/off is circumvented internally, as an analytic centre for the original bounds and constraints...
This is a duplicate of #2174
Fixed by #2203