Backwards - ReLU & Dense Lasyer

Made the backwards for dense layers and ReLU, but I think I soon need to refactor some code to make it all steamlined.

include/numerics/vecrandom.h

@@ -0,0 +1,48 @@
+#ifndef _vecrandom_n_
+#define _vecrandom_n_
+
+#include "./utils/vector.h"
+#include "./utils/matrix.h"
+#include "./core/omp_config.h"
+
+namespace numerics{
+	
+	template <typename T>
+	void inplace_vecrandom_add(utils::Vector<T>& a, const T lower, const T higher) {
+	    
+	    const uint64_t N = a.size();
+
+	    utils::Vector<T> b;
+	    b.random(N, lower, higher);
+
+	    a.inplace_add(b);
+	}
+
+	template <typename T>
+	void inplace_vecrandom_mul(utils::Vector<T>& a, const T lower, const T higher) {
+	    
+	    const uint64_t N = a.size();
+
+	    utils::Vector<T> b;
+	    b.random(N, lower, higher);
+
+	    a.inplace_multiply(b);
+
+	}
+
+
+	template <typename T>
+	utils::Vector<T> vecrandom_add(const utils::Vector<T>& a, const T lower, const T higher) {
+	    
+	    const uint64_t N = a.size();
+
+	    utils::Vector<T> b;
+	    inplace_vecrandom_add(b, lower, higher);
+
+	    return b;
+	}
+
+
+} // namespace numerics
+
+#endif // _vecrandom_n_