Added comment blocks to GD class

src/LearningMethods/GradientDescent.h

@@ -35,7 +35,15 @@ namespace lib4neuro {
          * Number of iterations to reset step size to tolerance/10.0
          */
         size_t restart_frequency;
+
+        /**
+         *
+         */
 		size_t batch;
+
+		/**
+		 *
+		 */
 		size_t iter_max;
 
         /**