#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;
	};
}
}