preserve sum when inverting scores

scottcheng · Feb 13, 2013 · 8bd290c · 8bd290c
1 parent c208ec1
commit 8bd290c
Showing 1 changed file with 2 additions and 3 deletions.
diff --git a/lib/genetic/Task.js b/lib/genetic/Task.js
@@ -173,12 +173,11 @@ Task.prototype.reproduction = function (callback) {
       }
       , function (callback) {
         // invert scores, if we minimize fitness
-        var maxScore = Math.abs(self.statistics.maxScore)
+        var avg = self.statistics.avg
         if (self.minimize) {
           async.forEach(self.parents
             , function (item, cb) {
-              item.score*=-1
+              item.score = avg * 2 - item.score
-              item.score+=maxScore
               process.nextTick(function () {cb()})
             }
             , function (err) {