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/**
*
* This file is part of Tulip (www.tulip-software.org)
*
* Authors: David Auber and the Tulip development Team
* from LaBRI, University of Bordeaux
*
* Tulip is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation, either version 3
* of the License, or (at your option) any later version.
*
* Tulip is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details.
*
*/
#ifndef NEIGHBORHOODDECREASINGFUNCTION_H_
#define NEIGHBORHOODDECREASINGFUNCTION_H_
#include "TimeDecreasingFunction.h"
/**
* @brief Interface for distance rate computation functions.
* Interface for distance rate computation functions. Distance rate is used in learning rate computation to handle the distance factor.
* These objects take a TimeDecreasingFunction as the diffusion coefficient evolve with distance but also with time.
* See SOM algorithm for more details on time coefficient in SOM computation.
*/
class DiffusionRateFunction {
public:
DiffusionRateFunction(TimeDecreasingFunction* decreasingFunction);
virtual ~DiffusionRateFunction();
/**
* Compute the diffusion rate in function of the current time and the distance.
* @param distance The distance between the BMU and the node. This distance is the number of node to go through from BMU to current node.
* @param currentIteration The current iteration number.
* @param maxIteration The maximum iteration number.
* @param inputSampleSize The sample size.
* @return the diffusion rate.
*/
virtual double computeSpaceRate(unsigned int distance,
unsigned int currentIteration, unsigned int maxIteration,
unsigned int inputSampleSize) = 0;
TimeDecreasingFunction* getTimeDecreasingFunction();
void setTimeDecreasingFunction(TimeDecreasingFunction* timeFunction);
protected:
TimeDecreasingFunction *timeFunction;
};
#endif /* NEIGHBORHOODDECREASINGFUNCTION_H_ */
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