#ifndef _OPT_BACK_PROPAGATION_H_
#define _OPT_BACK_PROPAGATION_H_

#include  "BackPropagation.h"

/*
 * http://proceedings.informingscience.org/InSITE2005/P106Otai.pdf
 */

namespace NeuralNetwork
{
namespace Learning
{
	class OpticalBackPropagation : public BackPropagation
	{
		public:
			inline OpticalBackPropagation(LayerNetwork &n): BackPropagation(n) {}
		protected:
			virtual float correction(const float&  expected, const float& computed) override
			{
				register float tmp=(expected-computed);
				register float ret=1+exp(tmp*tmp);
				return tmp < 0? -ret:ret;
			};
	};
}
}
#endif