## Generated by Codox

# Propeller 0.3.2

# propeller.selection

Propeller includes many kinds of genetic operators to select parents within the population such as tournament selection, lexicase selection, and epsilon lexicase selection.

### epsilon-lexicase-selection

`(epsilon-lexicase-selection pop argmap)`

Selects an individual from the population using epsilon-lexicase selection. Epsilon lexicase selection follows the same process as lexicase selection except, for a test case, only individuals with an error outside of a predefined epsilon are filtered.

### epsilon-list

`(epsilon-list pop)`

List of epsilons for each training case based on median absolute deviation of errors.

### fitness-proportionate-selection

`(fitness-proportionate-selection pop argmap)`

Selects an individual from the population using a fitness proportionate selection.

### lexicase-selection

`(lexicase-selection pop argmap)`

Selects an individual from the population using lexicase selection. Lexicase parent selection filters the population by considering one random training case at a time, eliminating any individuals with errors for the current case that are worse than the best error in the selection pool, until a single individual remains.

### motley-batch-lexicase-selection

`(motley-batch-lexicase-selection pop argmap)`

Selects an individual from the population using motley batch lexicase selection. Cases are combined in random collections of max size (:max-batch-size argmap).

### select-parent

`(select-parent pop argmap)`

Selects a parent from the population using the specified method.

### tournament-selection

`(tournament-selection pop argmap)`

Selects an individual from the population using tournaments of tournament-size by taking the individual in the tournament with the lowest :total-error.