[Cbc] Using CBC as a primal heuristic solver

[John Forrest]

Fei,

You should be able to pass an integer solution to Cbc e.g. by mipstart 
and then do RINS.

If you don't want to do cuts etc in Cbc then set maxnodes to -1.

I don't think you can use a partial solution for the feasibility pump - 
an interesting idea though.

John Forrest
On 28/01/14 19:25, Fei Peng wrote:
> Hi,
>
> I'm new to using CBC, and what I'm trying to do might be a little
> different from most:
>
> I have a branch-and-price solver that I coded up for my mip problem,
> from which I'll get various fractional and integer solutions at
> different nodes. I'd like to use Cbc and its general purpose primal
> heuristics (e.g. feasibility pump and RINS) to try and find feasible
> integer solutions to my problem, but I don't want to use Cbc to solve
> the full problem for me (b/c its too big and slow and that's the
> reason I'm solving it with B&P).
>
> I can give the full problem to cbc, invoke it and run a number of
> heuristics at the root node (and maybe a number of additional nodes),
> however, is there  a way to pass a fractional/integer solution to cbc,
> and have it run some heuristics just with that solution (e.g. feaspump
> for fractional and RINS for integer)? I'm not sure if
> sethotstart/setbestsolution already does that (the reference page is
> rather vague) but my guess is that a feasible integer sol passed to
> cbc is used as a new upper bound but not anything else? Please advise
>
> Thanks much!
> Fei
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