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mlubin avatar mlubin commented on August 18, 2024

Agreed it should be a separate function. The input could be a single flat
vector with NaN entries for unspecified values. This is the format we use
in MathProgBase.
On Jun 14, 2016 03:12, "Robert Schwarz" [email protected] wrote:

To give an initial solution, the user might want to give values for (a
subset of) the variables.
These should be checked at the beginning of the solve.

I prefer to not change the signature of CSIPaddVar and instead provide a
new function CSIPsetInitialValues, analogous to the bounds.

Also, I'm not sure whether SCIP already supports "partial" solutions, but
I believe it's still WIP. In that case, I don't want to implement anything
on the CSIP side now, but just try to pass the (0-filled?) values as a full
solution candidate.

See also the discussion about heuristic callbacks in #3
#3.


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rschwarz avatar rschwarz commented on August 18, 2024

So there will be a heuristic plugin in the next SCIP release (or now, on the master branch) that supports "partial solutions". We would then be able to call SCIPcreatePartialSol and the subtree below the fixations will be searched with some limits.

In the current release, only full solutions are supported.

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mlubin avatar mlubin commented on August 18, 2024

Can you call SCIPcreatePartialSol during the solve also?

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rschwarz avatar rschwarz commented on August 18, 2024

No, according to the docs, it's only possible in the PROBLEM stage.

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