/*
 * HiddenLayer.hpp
 *
 *  Created on: 21.09.2014
 *      Author: jens
 */

#ifndef HIDDENLAYER_HPP_
#define HIDDENLAYER_HPP_

#include "Layer.hpp"
#include <cmath>

class HiddenLayer : public Layer
{
public:
	HiddenLayer(uint32_t numUnits = 0, const double *pStatesInit = nullptr)
	: Layer(numUnits, pStatesInit)
	{
	}

	virtual ~HiddenLayer()
	{
	}

	double getEnergy(const Weights &weights)
	{
		uint32_t i;
		double energy = 0;

		for (i=0; i < getNumUnits(); i++)
		{
			energy -= weights.getBiasHidden()[i] * getStates()[i];
		}
		return energy;
	}

private:
	double accum(const Layer &layer, const Weights &weights, uint32_t index) const
	{
		uint32_t i;
		double sum = weights.getBiasVisible()[index];
		const double *pStates = layer.getStates();

		for (i=0; i <  layer.getNumUnits(); i++)
		{
			sum += pStates[i] * weights.getWeights()[index][i];
		}

		return sum;
	}
};

#endif /* HIDDENLAYER_HPP_ */