Type: int
Modifiable: Yes

When solving a MIP model, the Gurobi Optimizer maintains a solution pool that contains the best solutions found during the search. The PoolIgnore attribute allows you to discard some solutions. Specifically, if multiple solutions differ only in variables where PoolIgnore is set to 1, only the solution with the best objective will be kept in the pool. The default value for the attribute is 0, meaning that the variable should be used to distinguish solutions.

This attribute is particularly helpful when used in conjunction with the PoolSearchMode parameter. By identifying variables that do not capture meaningful differences between solutions, you can make sure that the pool contains some interesting variety.

For examples of how to query or modify attributes, refer to our Attribute Examples.