Solve checkstyle issues and SpotBugs issues

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

@@ -47,14 +47,14 @@ public class HyperParameters {
             final OptimizationAlgorithm algorithm,
             final Activation activation_function) {
         this(neurons_number, learning_rate, algorithm,
-                activation_function, (Double) null);
+                activation_function, 100);
     }
 
     /**
      * Getter for neuron_number.
      * @return
      */
-    public int getNeuronsNumber() {
+    public final int getNeuronsNumber() {
         return neurons_number;
     }
 
@@ -62,7 +62,7 @@ public class HyperParameters {
      * Getter for learning rate.
      * @return
      */
-    public double getLearningRate() {
+    public final double getLearningRate() {
         return learning_rate;
     }
 
@@ -70,7 +70,7 @@ public class HyperParameters {
      * Getter for backpropagation algorithm.
      * @return
      */
-    public OptimizationAlgorithm getAlgorithm() {
+    public final OptimizationAlgorithm getAlgorithm() {
         return algorithm;
     }
 
@@ -78,7 +78,7 @@ public class HyperParameters {
      * Getter for activation function.
      * @return
      */
-    public Activation getActivationFunction() {
+    public final Activation getActivationFunction() {
         return activation_function;
     }
 
@@ -86,7 +86,7 @@ public class HyperParameters {
      * Getter for percent_test_train.
      * @return
      */
-    public double getPercentTestTrain() {
+    public final double getPercentTestTrain() {
         return percent_test_train;
     }
 }

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

@@ -21,7 +21,7 @@ public final class MainDL4J {
      */
     public static void main(final String[] args) {
 
-        String file_name = args[0];
+        //String file_name = args[0];
         double learning_rate = Double.parseDouble(args[1]);
         OptimizationAlgorithm optimization_algorithm;
         Activation activation_function;