How Get Weight Matrix from NN FANN?

Question

I'm using FANN to use Neural Network. (Link to FANN)

I need to get the matrix of weight after trained the network, but I didn't find anything from documentation. (Link to documentation)

Do you know how get that matrix???

Thank you!

Answer 1

You need to use fann_get_connection_array() function. It gives you array of struct fann_connection, and struct fann_connection has field weight, so it's what you want.

You can do something like this to print your weight matrix:

int main(void)
{
    struct fann *net;              /* your trained neural network */
    struct fann_connection *con;   /* weight matrix */
    unsigned int connum;           /* connections number */
    size_t i;

    /* Insert your net allocation and training code here */
    ...

    connum = fann_get_total_connections(net);
    if (connum == 0) {
        fprintf(stderr, "Error: connections count is 0\n");
        return EXIT_FAILURE;
    }

    con = calloc(connum, sizeof(*con));
    if (con == NULL) {
        fprintf(stderr, "Error: unable to allocate memory\n");
        return EXIT_FAILURE;
    }

    /* Get weight matrix */
    fann_get_connection_array(net, con);

    /* Print weight matrix */
    for (i = 0; i < connum; ++i) {
        printf("weight from %u to %u: %f\n", con[i].from_neuron,
               con[i].to_neuron, con[i].weight);
    }

    free(con);

    return EXIT_SUCCESS;
}

Details:

[1] fann_get_connection_array()

[2] struct fann_connection

[3] fann_type (type for weight)