From time to time, it can be useful to evaluate all solutions in a solution pool at once. For instance, one might consider as evaluation of a solution its rank within the population. That its, the best solution would have rank 1, the next best rank 2, etc. In order to perform such an evaluation, you need to have access to the entire solution pool: each solution cannot be evaluated in isolation. To do this, in Solver IIM, there is the notion of a multiple evaluator which can be used to evaluate entire solution pools at once. You will find more information on evaluating solution pools in Chapter 30, Using More Advanced EA Features.
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