Dakota Reference Manual: layer_rank

| Dakota Reference Manual Version 6.15 Explore and Predict with Confidence

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layer_rank

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

## Specification

Alias: none

Argument(s): none

## Description

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.