Starting on the model.h, but need to make layer structs and structs for loss and optimizers

include/numerics/detail/sign_serial.h

@@ -0,0 +1,48 @@
+#pragma once
+
+#include <cstdint> //uint64_t
+#include <cmath> // std::abs
+
+#include "utils/vector.h"
+#include "utils/matrix.h"
+
+namespace numerics::detail{
+	
+
+
+	template <typename T>
+	void inplace_sign_serial(T& c) {
+		if (c < T{0}){
+			c = T{-1};
+		}
+		else if(c > T{0}){
+			c = T{1};
+		}
+		else{
+			c = T{0};
+		}
+	}
+		
+	template <typename T>
+	void inplace_sign_serial(utils::Vector<T>& v) {
+		const uint64_t n = v.size();
+		for (uint64_t i = 0; i < n; ++i){
+			inplace_sign_serial(v[i]);
+		}
+	}
+
+
+	template <typename T>
+	void inplace_sign_serial(utils::Matrix<T>& A) {
+	    const uint64_t rows = A.rows();
+	    const uint64_t cols = A.cols();
+		for (uint64_t i = 0; i < rows; ++i){
+			for (uint64_t j = 0; j < cols; ++j){
+				inplace_sign_serial(A(i,j));
+			}
+		}
+	}
+
+
+} // namespace numerics
+