[SCIP] Separators statistic

[Wang, Tony Congqian]

Dear abbas omidi,

You might want to take a look at https://scip.zib.de/doc/html/scip__solvingstats_8c_source.php#l02821.

The total number of applied can be found in general statistics or in the solving output.

Regarding the Seprators statistic table: Calls keeps track of how often a Separator has been called, Cutoffs keeps track of how often a node has been proved to be infeasible or to be having a lower dual bound than the current primal bound by a Separator, DomReds are essentially the number of singleton cuts found.

Now what is weird though, is that Cuts is supposed to be the number of Cuts found by a Separator and Applied keeps track of how many Cuts, found by a Separator have been applied. Now as it can be seen in this picture, sometimes Applied for a given Separator is positive, although Cuts is zero.

This is something I was also wondering about and I would be interested in knowing the reason for this behavior. Is there simply some bug, or is there some intention, that I missed?

Regards,
Tony

________________________________
Von: Scip <scip-bounces at zib.de> im Auftrag von abbas omidi <abb.omidi at gmail.com>
Gesendet: Samstag, 10. August 2019 00:19
An: scip at zib.de
Betreff: [SCIP] Separators statistic

Dear community team,

I'm trying to solve a MIP just using separating options. I turn off Emphasis settings for presolving and heuristics. When I solve the model, I get some results in the following:

[Separators.jpg]
 I was wondering if,
a) what do "separating columns" mean? (calls, cutoffs, ...)
b) how can I find the number of Cutting Planes which be applied in the model?
c) what is the difference between calls, cuts and applied columns?

Regards
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