if (nodes[i].type === 'output' || (!found_output_nodes && nodes[i].outgoing.length + nodes[i].gated.length === 0)) {
    nodes[i].type = 'output';
    network.output_size++;
    outputs.push(nodes[i]);
    nodes.splice(i, 1);
  } else if (nodes[i].type === 'input' || (!found_input_nodes && !nodes[i].incoming.length)) {
    nodes[i].type = 'input';
    network.input_size++;
    inputs.push(nodes[i]);
    nodes.splice(i, 1);
  }