Pool Solutions

Answered

Rick Stone

March 04, 2023 06:12

We are trying to solve for a finite number of integer solutions under a pre-determined OBJX value (minimization problem) using the Solution Pool functionality.

We have PoolSearchMode=1, which is supposed to bring us the first X=9999 solutions, not necessarily the best.  We also have a cutoff set to find all solutions under OBJX=800.

When we terminate the solve prematurely, we get a message that it has found 9999 solutions from 0 to 198.  We also see in the log that the Worst Incumbent is 198.  To me, this seems to indicate that it is trying to find the "best" 9999 solutions (PoolSearchMode=2), not the first 9999 solutions (PoolSearchMode=1).  In fact, I can see in the log that it has found solutions in the 400 and 500 range earlier on.

Furthermore, our callback that is supposed to be triggered when a solution is found has only been called 778 times, not 9999.

Are we doing something wrong here?

  

 

 

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  Riley Clement

  • Gurobi Staff

  March 06, 2023 08:49

  Hi Rick,

  I am converting this to a ticket for you in our online support portal where we handle requests from our commercial customers.  You should receive an email shortly.

  Kind Regards,
  Riley

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