[Couenne] Rounding NLP heuristic

[Akshay Gupte]

Pietro,
Thanks for the info. Is there any estimate on when FP will become available, atleast in the trunk version ?

Regards,
Akshay Gupte
PhD student, Operations Research
Georgia Institute of Technology
akshayg at gatech.edu






On Mar 28, 2011, at 8:21 PM, Pietro Belotti wrote:

> Akshay,
> 
> just to add to what Giacomo said: FP is still under development and not usable at all.
> 
> Pietro
> 
> --
> Pietro Belotti
> Dept. of Mathematical Sciences
> Clemson University
> email: pbelott at clemson.edu
> phone: 864-656-6765
> web:   myweb.clemson.edu/~pbelott
> 
> On Mon, 28 Mar 2011, Giacomo Nannicini wrote:
> 
>> Both FP and IR are in Couenne trunk. I do not know if they are
>> released in stable yet.
>> IR is working in trunk, but it is *highly* recommended to compile with
>> Cplex if you want to use it.
>> 
>> Giacomo
>> 
>> On Mon, Mar 28, 2011 at 5:32 PM, Akshay Gupte <akshayg at gatech.edu> wrote:
>>> Giacomo,
>>> Thanks for the tip. I will try the branching idea.
>>> 
>>> Are FP and IR codes publicly available within Couenne or otherwise ?
>>> 
>>> Regards,
>>> Akshay Gupte
>>> PhD student, Operations Research
>>> Georgia Institute of Technology
>>> akshayg at gatech.edu
>>> 
>>> 
>>> 
>>> 
>>> 
>>> 
>>> On Mar 28, 2011, at 5:29 PM, Giacomo Nannicini wrote:
>>> 
>>>> Akshay,
>>>> typically what I do when I am only interested in heuristics, is to set
>>>> the maximum number of nodes to 0 (the option is: node_limit 0).
>>>> However, as far as I know the default heuristic Couenne Rounding NLP
>>>> needs candidate points discovered during Branch-and-Bound as input. If
>>>> you stop at the root node, you will not have many candidates. Try to
>>>> branch for a large enough number of nodes with a fast branching
>>>> strategy, to get many candidate points.
>>>> 
>>>> You should also consider using some of the other available heuristics
>>>> (FeasibilityPump and IterativeRounding). Those can do a lot of work
>>>> just at the root node.
>>>> 
>>>> Giacomo
>>>> 
>>>> On Mon, Mar 28, 2011 at 5:09 PM, Akshay Gupte <akshayg at gatech.edu> wrote:
>>>>> Hi all,
>>>>> Is there an option to run only the rounding heuristic within Couenne for a specified amount of time ? I am particularly interested in finding feasible solutions to my model.
>>>>> 
>>>>> Regards,
>>>>> Akshay Gupte
>>>>> 
>>>>> 
>>>>> 
>>>>> 
>>>>> 
>>>>> 
>>>>> 
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>>>>> 
>>> 
>>> 
>> 
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