threshold.h

#include <cmath>
#include <vector>
#include <cstdio>
 
class BodyFeatures;
 
class Bundle{
    float x=1;
    float y=1;
    float angle=1;
    float width=1;
    float length=1;
 
    public:
    Bundle()=default;
 
    Bundle(float _x, float _y, float _a, float _w, float _l): x(_x), y(_y), angle(_a), width(_w), length(_l){}
    
    Bundle operator*(const Bundle & b)const;
 
    Bundle operator*(float)const;
 
    bool operator<(const Bundle & bf);
 
    Bundle operator+(const Bundle & b)const;
 
    Bundle operator-(const Bundle & b)const;
 
    float radius()const {
        return sqrt(pow(x,2)+pow(y,2));
    }
 
    float get_x()const {
        return x;
    }
 
    float get_y()const{
        return y;
    }
 
    float get_angle()const{
        return angle;
    }
 
    float get_width()const{
        return width;
    }
 
    float get_length()const{
        return length;
    }
 
 
    float sum_squares()const{
        return pow(x, 2) + pow(y, 2)+pow(angle, 2) +pow(width, 2) +pow(length, 2);
    }
 
    std::vector <float> get_vector()const{
        return {x, y, angle, width, length};
    }
};
 
template <typename T>
T linear_rectify(T value){
    if (value<0){
        value=0;
    }
    return value;
}
 
 
Bundle linear_rectify(const Bundle &);
 
 
class Threshold{
    public:
 
    Threshold()=default;
 
    Threshold(float e, float a, float d, float aff, float d_dim): 
    endPosition(e), angle(a), dPosition(d), affordance(aff), D_dimensions(d_dim){}
 
    float for_robot_position(){
        return endPosition;
    }
 
    float for_robot_angle(){
        return angle;
    }
 
    float for_affordance(){
        return affordance;
    }
 
    Bundle for_Di()const{ 
        return Di;
    }
 
    Bundle for_Dn()const{ 
        return Dn;
    }
 
    void set_Dn(const Bundle & b){
        Dn=b;
    }
 
    void set_Di(const Bundle & b){
        Di=b;
    }
    Bundle bundle_threshold(){
        return Bundle(dPosition, dPosition, angle, D_dimensions, D_dimensions);
    }
 
 
    private:
        float endPosition=0.05;// maximum radius from candidate state's end pose
        float angle= M_PI/6; // maximum angle difference
        float dPosition= 0.065;// maximum difference between disturbance positions
        float affordance =0; //maximum difference between affordances
        float D_dimensions=0.03; //maximum differences in disturbance dimensions
        Bundle Di=Bundle(dPosition, dPosition, angle, D_dimensions, D_dimensions), Dn=Di;
};
 
class ThresholdLearner{
    protected:
    Bundle Di_weights, Dn_weights;
    float mu=0.001; //learning rate
    public:
    ThresholdLearner()=default;
 
    void set_learning_rate(float f){
        mu=f;
    }
 
    Bundle get_Di_weights(){
        return Di_weights;
    }
 
    Bundle get_Dn_weights(){
        return Dn_weights;
    }
 
    void log(){
        FILE *f= fopen("/tmp/threshold_weights.txt", "a+");
        fprintf(f, "%f\t%f\t%f\t%f\t%f\t\t%f\t%f\t%f\t%f\t%f\n", Di_weights.get_x(), 
                                                                Di_weights.get_y(), 
                                                                Di_weights.get_angle(),
                                                                Di_weights.get_length(),
                                                                Di_weights.get_width(),
                                                                Dn_weights.get_x(), 
                                                                Dn_weights.get_y(), 
                                                                Dn_weights.get_angle(),
                                                                Dn_weights.get_length(),
                                                                Dn_weights.get_width()
                                                                );
        fclose(f);
    }
 
    void make_log(){
        FILE *f= fopen("/tmp/threshold_weights", "w+");
        fclose(f);
    }
 
    virtual void Di_tune(const Bundle & error, const Bundle & x)=0;
 
    virtual Bundle update_bundle(const Bundle & error, const Bundle & x)=0;
    
    Threshold get_weighted(const Threshold & t){
        Threshold result;
        result.set_Di(t.for_Di()*Di_weights);
        result.set_Dn(t.for_Dn()*Dn_weights);
        return result;
    }
 
 
};