Test problem from the set of "multimodal multiobjective functions" as for instance used in the CEC2019 competition.
makeMMF7Function()[smoof_multi_objective_function]
Caitong Yue, Boyang Qu, Kunjie Yu, Jing Liang, and Xiaodong Li, "A novel scalable test problem suite for multimodal multiobjective optimization," in Swarm and Evolutionary Computation, Volume 48, August 2019, pp. 62–71, Elsevier.