MlpTrainXOR.c

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#define ae2f_MAC_BUILD 0
 
#include "ae2f/Float.h"
#include <ae2f/Ann/Mlp.h>
#include <stdio.h>
#include <math.h>
 
static void Act(ae2f_float_t* r, ae2f_float_t x) {
    *r = 1.0 / (1.0 + exp(-x));
}
 
static void ActDeriv(ae2f_float_t* r, ae2f_float_t output) {
    *r =  output * (1.0 - output);
}
 
static void LossDeriv(ae2f_float_t* r, const ae2f_float_t* output, const ae2f_float_t* target, size_t i, size_t c) {
    *r = ((output[i] - target[i]) / c);
}
 
/** Cross entrophy */
static void
LossDerivCROSS(ae2f_float_t* r, const ae2f_float_t* output, const ae2f_float_t* target, size_t i, size_t c) {
    const ae2f_float_t epsilon = 1e-7; // Small value to prevent division by zero
    ae2f_float_t o_i = output[i];
    // Clip output to avoid log(0) or division by zero
    o_i = o_i < epsilon ? epsilon : (o_i > 1.0 - epsilon ? 1.0 - epsilon : o_i);
    r[0] = (o_i - target[i]) / (c * o_i * (1.0 - o_i));
}
 
const ae2f_float_t inp[4][2] = {
    {0, 0},
    {0, 1},
    {1, 0},
    {1, 1}
};
 
const ae2f_float_t goal_xor[4] = {0, 1, 1, 0};
 
ae2f_float_t output[1] = { 0.5 };
ae2f_err_t err[1] = {0, };
ae2f_AnnMlp* mlp;
size_t lenv[] = {2, 3, 1};
 
size_t i, j, k;
 
int main() {
    ae2f_AnnMlpMk(err, &mlp, 3
            , lenv
            , 0, 0, 0
            , LossDerivCROSS
            , 0, 0, 0, 0
            , 0.6, 0.5
 
            , 3, 3
            );
 
    assert(mlp->m_learningrate != 0);
    assert(mlp->m_learningrate_bias != 0);
 
    for(i = 0; i < 2; i++) {
        mlp->m_bias[i] = ((double)rand() / RAND_MAX) -  0.5;
        mlp->m_act[i] = Act;
        mlp->m_actderiv[i] = ActDeriv;
        for(j = 0; j < 9; j++) {
            mlp->m_weight[j + i * 9] = ((double)rand() / RAND_MAX) - 0.5;
        }
    }
 
    if(err[0]) {
        printf("[Error]: %d\n", err[0]);
        assert(0 && "errval has occurred.");
    }
 
    for(j = 0; j < 4; j++) {
        ae2f_AnnMlpPredict(err, mlp, inp[j], output);
        assert(!err[0] && "err from predict");
        printf("%f %f -> %f\n", inp[j][0], inp[j][1], output[0]);
    }
 
    for(i = 0; i < 9000; i++) {
        for(j = 0; j < 4; j++) {
            ae2f_AnnMlpTrainAuto(
                    err, mlp, inp[j]
                    , &goal_xor[j]);
 
            assert(!err[0] && "err from TrainAutoStream");
        }
    }
 
    for(j = 0; j < 4; j++) {
        ae2f_AnnMlpPredict(err, mlp, inp[j], output);
        assert(!err[0] && "err from predict");
        printf("%f %f -> %f\n", inp[j][0], inp[j][1], output[0]);
    }
 
    ae2f_AnnMlpDel(mlp);
    return 0;
}