Created
April 13, 2012 09:08
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Lexicase Parent selection implementation for clojush
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| (defn lexicase-selection | |
| "Returns an individual that does the best on a randomly selected set of fitness cases" | |
| [pop tournament-size] | |
| (loop [survivors pop | |
| cases (shuffle (range (count (:errors (first pop)))))] | |
| (if (or (empty? cases) | |
| (empty? (rest survivors))) | |
| (first survivors) | |
| (let [min-err-for-case (apply min (map #(nth % (first cases)) | |
| (map #(:errors %) survivors)))] | |
| (recur (filter #(= (nth (:errors %) (first cases)) min-err-for-case) | |
| survivors) | |
| (rest cases)))))) | |
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