private static void TestThreads()
{
    List<Thread> threads = new List<Thread>();

    const int THREADS_COUNT = 5;

    for(int t = 0; t < THREADS_COUNT; t++)
    {
        Thread thread = new Thread(() =>
        {
            Graph g = new Graph();
            g.Import("model.pb");
            Session session = new Session(g);
        });
        thread.Start();
        threads.Add(thread);
    }

    threads.ForEach(t => t.Join());
}