Classifier.h

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#pragma once
 
#include "../Matrix.h"
#include "Predictor.h"
 
 
class Classifier : public Predictor
{
protected:
  bool w_initialized = false;
 
public:
  Matrix<double> weights;
  Matrix<double> costs;
 
  Classifier() { }
 
  void initialize_weights(size_t numRows, size_t numColumns = 1) {
    weights       = Matrix<double>(0, numRows + 1, numColumns);
    w_initialized = true;
  }
 
  void update_weights(const Matrix<double>& update, const Matrix<double>& delta) {
    for(size_t i = 0; i < weights.rows(); i++) {
      for(size_t j = 0; j < weights.columns(); j++) {
        if(i == 0) weights(i, j) += update(i, j);
        else
          weights(i, j) += delta(i - 1, j);
      }
    }
  }
  Matrix<double> transform(const Matrix<double>& in) override { return in; }
};
 
 
class ANNClassifier : public Classifier
{
protected:
  double eta;
  int n_iter;
 
public:
  ANNClassifier(double _eta, int _n_iter)
    : Classifier()
    , eta(_eta)
    , n_iter(_n_iter) { }
 
  virtual Matrix<double> activation(const Matrix<double>&) = 0;
 
  virtual Matrix<double> netInput(const Matrix<double>&) = 0;
 
  virtual double costFunction(const Matrix<double>&) = 0;
};