/*
    Copyright (C) 2012 Bartosz Broda, Jacek Bochenek, Łukasz Biłeńkij, 
    Damian Jaworski, Wojciech Mazur, Dominik Piasecki, Maciej Piasecki, 
    Radosław Ramocki
    
    This program 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.

    This program 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 LICENSE and COPYING files for more details.
*/

#ifndef COMPARATOR_ENTROPY
#define COMPARATOR_ENTROPY
#include "../comparator_stdheaders.h"
#include "FilterFeature.h"

namespace smartcomparator
{
	namespace filters
	{
		/**
		  * Removes given precentage of most noisy features (globally)
		  */
		class SMART_COMPARATOR_API EntropyFilter  : public FilterFeature
		{
		public:
			EntropyFilter(Matrices::FeatureVectorPtr cf, double precentage_to_remove,
						 bool remove_zeroes = true);
			virtual ~EntropyFilter(void);

			/**
			  * \return indices of features that passed the filtering process
			  */
			virtual void Filter(std::set<size_t> &out,const std::set<size_t> *nzind);

		protected:
			bool m_bRemoveZeros;
			double m_dPrecentageToRemove;
			std::set<size_t> m_setRemoveIndices;
		};

	} //ns filters
}// ns smartcomparator

#endif //COMPARATOR_ENTROPY
