nca.h

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/*
 * NCA.h
 *
 *  Created on: Feb 25, 2013
 *      Author: xmipp
 */

#ifndef NCA_H_
#define NCA_H_

#include <core/matrix2d.h>
#include <core/matrix1d.h>
#include "dimred_tools.h"

class NeighbourhoodCA: public DimRedAlgorithm
{
public:
    double lambda;

    Matrix1D<unsigned char> labels;

    int K;
public:
    // Auxiliary variables for evaluating the objective function
    Matrix2D<double> D2Y, A;
    Matrix1D<double> D2YRowSum;

    // Index of the nearest neighbors to each one of the observations
    Matrix2D<int> idx;
public:
    void setLabels(const Matrix1D<unsigned char> &labels);

    void setSpecificParameters(double lambda=0., int K=12);

    double objectiveFunction();

    void reduceDimensionality();
};

#endif /* NCA_H_ */