Export to ONNX randomly fails about eddl HOT 9 CLOSED

#include <cstdio>
#include <cstdlib>
#include <iostream>

#include "eddl/apis/eddl.h"

#include "eddl/serialization/onnx/eddl_onnx.h" // Not allowed

using namespace eddl;

int main(int argc, char **argv) {

    int epochs = 1;
    int olength = 20;
    int outvs = 2000;
    int embdim = 32;

    Net* net = download_resnet18(true, {3, 256, 256});
    layer lreshape = getLayer(net, "top");
    layer dense_layer = HeUniform(Dense(lreshape, 20, true, "out_dense"));
    layer cnn_out = Sigmoid(dense_layer, "cnn_out");
    layer concat = Concat({lreshape, cnn_out}, 0, "cnn_concat");


    layer image_in = getLayer(net, "input");

    layer ldecin = Input({outvs});
    layer ldec = ReduceArgMax(ldecin, {0});
    ldec = RandomUniform(
            Embedding(ldec, outvs, 1, embdim, true), -0.05, 0.05
    );

    ldec = Concat({ldec, concat});
    layer l1 = LSTM(ldec, 512, true);
    layer out = Softmax(Dense(l1, outvs), 0, "out_cnn");

    setDecoder(ldecin);
    net = Model({image_in}, {out});


    build(net,
          adam(0.001),              // Optimizer
          {"soft_cross_entropy"},   // Losses
          {"categorical_accuracy"}, // Metrics
          CS_GPU({1}, 1, "full_mem"),                // Computing service
          true                      // Enable parameters initialization
    );
    summary(net);


    Tensor* x_train = Tensor::randn({48, 256, 256, 3});
    Tensor* y_train = Tensor::zeros({48,20, outvs});

    x_train->permute_({0, 3, 1, 2});
    y_train->set_select({":", ":", "0"}, 1.0);


    fit(net, {x_train}, {y_train}, 6, epochs);
    save(net, "img2text.bin", "bin");
    

     /////    /////    /////    /////    /////    /////    /////    /////    /////    /////
     ///// FIX: add the "seq_len" parameter => here, variable "length"
    save_net_to_onnx_file(net, "img2text.onnx", length); 
    /////    /////    /////    /////    /////    /////    /////    /////    /////    /////


    cout << "Saved net to onnx file" << endl;
	
	return 0;
}