reffactored and recurrent implementation

include/NeuralNetwork/ActivationFunction/HyperbolicTangent.h

@@ -0,0 +1,27 @@
+#pragma once
+
+#include "./ActivationFunction.h"
+
+#include <cmath>
+
+namespace NeuralNetwork {
+namespace ActivationFunction {
+
+	class HyperbolicTangent: public ActivationFunction {
+		public:
+			HyperbolicTangent(const float& lam=1):lambda(lam) {}
+			inline virtual float derivatedOutput(const float&,const float &output) override { return lambda*(1-output*output); }
+			inline virtual float operator()(const float &x) override { return tanh(lambda*x); };
+			virtual ActivationFunction* clone() const override {
+				return new HyperbolicTangent(lambda);
+			}
+
+			virtual std::string stringify() const override {
+				return "{ \"class\": \"NeuralNetwork::ActivationFunction::HyperbolicTangent\", \"lamba\" : "+std::to_string(lambda)+"}";
+			}
+
+		protected:
+			float lambda;
+	};
+}
+}