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Model.cbUseSolution()
cbUseSolution ( )
Once you have imported solution values using
cbSetSolution,
you can optionally call cbUseSolution in a GRB.Callback.MIPNODE
callback to immediately use these values to try to compute a heuristic solution.
Alternatively, you can call cbUseSolution in a GRB.Callback.MIP
or GRB.Callback.MIPSOL callback, which will store the solution until
it can be processed internally.
Return value:
The objective value for the solution obtained from your solution values. It equals GRB.INFINITY if no improved solution is found or the method has been called from a callback other than GRB.Callback.MIPNODE as, in these contexts, the solution is stored instead of being processed immediately.
Example usage:
def mycallback(model, where):
if where == GRB.Callback.MIPNODE:
model.cbSetSolution(vars, newsolution)
objval = model.cbUseSolution()
model.optimize(mycallback)
