Adding Genetic Operators

In addition to the already-included genetic operators, you can add your own!

Variation Genetic Operators

1. Go to propeller.variation.cljc
2. Define a genetic operator function
3. In propeller.variation/new-individual, add the new genetic operator in the new-individual function under the case call

(defn new-individual
  "Returns a new individual produced by selection and variation of
  individuals in the population."
  [pop argmap]
  ...
     (case op
       ...
       
       :new-genetic-operator
       (-> (:plushy (selection/select-parent pop argmap))
           (new-genetic-operator ))
       ...
       :else
       (throw #?(:clj  (Exception. (str "No match in new-individual for " op))
                 :cljs (js/Error
                         (str "No match in new-individual for " op))))))})

4. When running a problem, specify the genetic operator in :variation. For example:

lein run -m propeller.problems.simple-regression :variation "{:new-genetic-operator 1.0}"

Selection Genetic Operators

1. Go to propeller.selection.cljc
2. Define a genetic operator function
3. In propeller.selection.cljc, add the new genetic operator in the select-parent function under the case call.

(defn select-parent
  "Selects a parent from the population using the specified method."
  [pop argmap]
  (case (:parent-selection argmap)
    ...
    :new-genetic-operator (:new-genetic-operator )
    ...
    ))

4. When running a problem, specify the selection method in :parent-selection

For example:

lein run -m propeller.problems.simple-regression :parent-selection :new-genetic-operator