initial import

core/mathx/entropy.go

@@ -0,0 +1,14 @@
+package mathx
+
+import "math"
+
+func CalcEntropy(m map[interface{}]int, total int) float64 {
+	var entropy float64
+
+	for _, v := range m {
+		proba := float64(v) / float64(total)
+		entropy -= proba * math.Log2(proba)
+	}
+
+	return entropy / math.Log2(float64(len(m)))
+}