Assign each member to a layer, based on domination the rank based on layers


  • Alias: None

  • Arguments: None


The fitness_type: layer_rank has been specifically designed to avoid problems with aggregating and scaling objective function values and transforming them into a single objective.

The layer_rank fitness assessor works by assigning all non-dominated designs a layer of 0, then from what remains, assigning all the non-dominated a layer of 1, and so on until all designs have been assigned a layer. The values are negated to follow the higher-is-better fitness convention.

Use of the below_limit selector with the layer_rank fitness assessor has the effect of keeping all those designs whose layer is below a certain threshold again subject to the shrinkage limit.