OCR/NeuralNetwork/toolsnetworks.c

#include "toolsnetworks.h"

#include <SDL2/SDL_image.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <time.h>

#include "Load.h"
#include "structure.h"
#include "training.h"
#include "traitement.h"

// Definition des fonctions de type outils et fonctions mathématiques

float my_rand(void)
{
    return ((float)(rand() % 10000) / 5000) - 1;
}

double sigmoid(double val)
{
    return (1.0 / (1.0 + exp(-1.0 * val)));
}

void softmax(Neural_Network_Layer *layer)
{
    double min = 0;
    for (int i = 0; i < layer->nb_cells; i++)
    {
        if (layer->cells[i].output < min)
            min = layer->cells[i].output;
    }

    double somme = 0;
    for (int i = 0; i < layer->nb_cells; i++)
    {
        layer->cells[i].output -= min;
        somme += exp(layer->cells[i].output);
    }

    for (int i = 0; i < layer->nb_cells; i++)
    {
        layer->cells[i].output = (exp(layer->cells[i].output) / somme);
    }
}

char indiceToChar(int indice)
{
    if (indice < 26)
        return indice + 97;
    else if (indice < 52)
        return indice + 39;
    else if (indice < 62)
        return indice - 4;
    else
    {
        if (indice == 62)
            return 46;
        else if (indice == 63)
            return 44;
        else
            return 39;
    }
}

double *imagetomatrix(char *str, int size)
{
    SDL_Surface *loadedImage = 0;
    loadedImage = SDL_LoadBMP(str);
    double *img = NULL;

    if (!loadedImage)
    {
        printf("Can't find the bmp file, %s\n", str);
        return img;
    }

    img = resizechar(loadedImage, size);
    return img;
}

double *segmentationtomatrix(SDL_Surface *loadedImage, int size)
{
    double *img = NULL;

    if (!loadedImage)
    {
        printf("Can't find the bmp file\n");
        return img;
    }

    img = resizechar(loadedImage, size);

    return img;
}