Diversity prediction theorem: Difference between revisions

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@@ Line 1,422: / Line 1,422: @@
 =={{header|Ruby}}==
 {{trans|D}}
-<lang ruby>def square(x)
+<lang ruby>def square(x) = x * x
+def mean(a) = a.sum(0.0) / a.size
-    return x * x
+def mean_square_diff(a, predictions) = mean(predictions.map { |x| square(x - a) })
-end
+def diversity_theorem(truth, predictions)
-def mean(a)
-    return a.sum(0.0) / a.size
-end
-def meanSquareDiff(a, predictions)
-    return mean(predictions.map { |x| square(x - a) })
-end
-def diversityTheorem(truth, predictions)
     average = mean(predictions)
-    print "average-error: ", meanSquareDiff(truth, predictions), "\n"
+    puts "average-error: #{mean_square_diff(truth, predictions)}",
-    print "crowd-error: ", square(truth - average), "\n"
+         "crowd-error: #{square(truth - average)}",
-    print "diversity: ", meanSquareDiff(average, predictions), "\n"
+         "diversity: #{mean_square_diff(average, predictions)}",""
-    print "\n"
-end
-def main
-    diversityTheorem(49.0, [48.0, 47.0, 51.0])
-    diversityTheorem(49.0, [48.0, 47.0, 51.0, 42.0])
 end
+diversity_theorem(49.0, [48.0, 47.0, 51.0])
-main()</lang>
+diversity_theorem(49.0, [48.0, 47.0, 51.0, 42.0])</lang>
 {{out}}
 <pre>average-error: 3.0