Optimizers - Part 1

Done with SGD and Adagrad, still need to optimize them but they work.

include/modules/neural_networks/layers/Dense_Layer.h

@@ -21,6 +21,11 @@ namespace neural_networks{
 			utils::Vector<T> dbiases;
 			utils::Matrix<T> dinputs;
 
+			// Variables for optimizers
+		    utils::Matrix<T> weight_momentums;
+		    utils::Vector<T> bias_momentums;
+		    utils::Matrix<T> weight_cache;
+		    utils::Vector<T> bias_cache;
 			
 			// Default Constructor
 			Dense_Layer() = default;