CODEWITHSUNDEEP
droolsoptaplanner
Harish Garg
Harish Garg

Reputation: 139

Get best 3 scores in Optaplanner?

Can we get top 3 best scores using constraints in Optaplanner?

For eg i have a use case where i need to show top 3 results which has highest score to user so that user can select the solution according to their need.

Upvotes: 0

Views: 383

Answers (1)

Geoffrey De Smet
Geoffrey De Smet

Reputation: 27312

Sounds like pareto optimization (see docs). Not yet supported in OptaPlanner officially.

But users have hacked it before, by implementing their own BestSolutionRecaller (= that class that holds the best solution(s)) and replacing the DefaultSolver's bestSolutionRecaller with it. This implies "taking the red pill" and "following the rabbit hole down to wonderland". Good luck :)

Important note: Pareto optimization goes much further than just remember the n best solutions. It's about remember the n best solutions which aren't dominated by one of the other best solutions. So it entails changing the score comparison (and breaking the transitive aspect of score comparison).

Upvotes: 3

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