Add debug info

src/main/java/be/cylab/java/wowa/training/MainDL4J.java

@@ -66,6 +66,7 @@ public final class MainDL4J {
         for (int neuron_number = begin_neuron_number;
              neuron_number < neuron_number_end; neuron_number++) {
             double average_auc = 0;
+            System.out.println("Neuron number : " + neuron_number);
             HyperParameters parameters
                     = new HyperParameters(neuron_number, learning_rate,
                     optimization_algorithm, activation_function);