BarsAndStripes.h

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/*!
 * \brief       Implements the Bars & Stripes benchmark problem.
 * 
 * \author      O. Krause, A.Fischer, K.Bruegge
 * \date        2012
 *
 *
 * \par Copyright 1995-2017 Shark Development Team
 * 
 * <BR><HR>
 * This file is part of Shark.
 * <https://shark-ml.github.io/Shark/>
 * 
 * Shark 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.
 * 
 * Shark 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 Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with Shark.  If not, see <http://www.gnu.org/licenses/>.
 *
 */
#ifndef UNSUPERVISED_RBM_PROBLEMS_BARSANDSTRIPES_H
#define UNSUPERVISED_RBM_PROBLEMS_BARSANDSTRIPES_H
 
#include  <shark/Data/Dataset.h>
#include  <shark/LinAlg/Base.h>
namespace shark{
 
///Generates the Bars-And-Stripes problem. In this problem, a 4x4 image has either rows or columns of the same value.
class BarsAndStripes{
private:
    UnlabeledData<RealVector> m_data;
public:
    BarsAndStripes(std::size_t batchSize = 32, bool bipolar = false){
        std::vector<RealVector> data(32,RealVector(16));
        RealVector line(4);
        for(size_t x=0; x != 16; x++) {
            for(size_t j=0; j != 4; j++) {
                line(j) = (x & (std::size_t(1)<<j)) > 0;
                if(bipolar && line(j)==0) line(j) = -1; 
            }
 
            for(int i=0; i != 4; i++) {
                subrange(data[x],i*4 ,i*4 + 4) = line;
            }
            for(int i=0; i != 4; i++) {
                for(int l=0; l<4; l++) {
                    data[16+x](l*4 + i) = line(l);
                }
            }
        }
        m_data = createDataFromRange(data,batchSize);
    }
    ///Returns all input pattern of the BarsAndStripes problem
    UnlabeledData<RealVector> data() const{
        return m_data;
    };
 
    ///returns the dimensionality of the data
    std::size_t inputDimension() const {
        return 16;
    }
};
 
}
#endif