datafeeder.h

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// -*- C++ -*-
#ifndef __LEMGA_DATAFEEDER_H__
#define __LEMGA_DATAFEEDER_H__

#include <iostream>
#include "learnmodel.h"

namespace lemga {

class DataFeeder {
public:
    enum NORMETHOD {   // normalization method
        MIN_MAX,       // make min -1, max +1
        MEAN_VAR,      // make mean 0, var 1
        NONE
    };

private:
    pDataSet dat;
    std::istream* perms;
    NORMETHOD _do_normalize;
    UINT fsize, train_size;

public:
    DataFeeder (const pDataSet&);
    DataFeeder (std::istream&);

    void set_permutation (std::istream& i) { perms = &i; }
    void do_normalize (NORMETHOD dn = MIN_MAX) { _do_normalize = dn; }
    UINT size () const { return fsize; }
    void set_train_size (UINT);

    pDataSet data () const { return dat; }
    bool next_train_test (pDataSet&, pDataSet&) const;

protected:
    bool next_permutation (std::vector<UINT>&) const;

    struct LINEAR_SCALE_PARAM {
        REAL center, scale;
    };
    typedef std::vector<LINEAR_SCALE_PARAM> LINEAR_SCALE_PARAMS;

    static LINEAR_SCALE_PARAMS min_max (DataSet&);
    static LINEAR_SCALE_PARAMS mean_var (DataSet&);
    static void linear_scale (DataSet&, const LINEAR_SCALE_PARAMS&);
};

} // namespace lemga

#ifdef  __DATAFEEDER_H__
#warning "This header file may conflict with another `datafeeder.h' file."
#endif
#define __DATAFEEDER_H__
#endif

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