[SCIP] QCP local Search and RENS

[Stefan Vigerske]

Hi,

On 01/13/2016 10:01 AM, Jakob Witzig wrote:
> Hi Ahmed,
>
> which QCP local search heuristic do you mean exactly?

I think what is now called the subNLP primal heuristic was denoted as 
"QCP local search heuristic" in some papers.

Stefan

> The heuristic RENS works also for MIQCPs. There are two parameters you
> have to take care of:
> 1) rens/startsol: You can decide whether you want to use the LP or NLP
> solution to fix variables. Per default RENS uses the LP relaxation,
> which is also fine for MIQCPs. If you want to use the NLP solution you
> should ensure that an NLP solver is included in SCIP.
> 2) rens/uselprows: If this parameter is TRUE, RENS uses the LP rows to
> create the subproblem. Otherwise RENS copies the CIP. In your case this
> should be FALSE (which is the default).
>
> Best
> Jakob
>
> Am 12.01.2016 um 23:04 schrieb Ahmed Ibrahim:
>> Hi SCIP community,
>>
>> I was wondering if the QCP (Quadratic Constrained Program) local search
>> heuristic is available in SCIP 3.2.0? If so can u tell me where can I
>> access its relevant files? I can't see it in
>> 'http://scip.zib.de/doc/html/group__PRIMALHEURISTICS.php'.
>>
>> Also, I'm wondering whether the current RENS is extended for MIQCPs?
>>
>> Regards,
>> Ahmed
>>
>>
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>>
>
>


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