refactor(core): introduce RandFcn typedef for random function

Replaced std::function<double()> with a typedef RandFcn in neural.cpp and neural.h for improved code readability and maintainability. This change simplifies the function signature and makes it easier to update or replace the random function type in the future. No functional changes were made.

Author: dlidstrom

Cpp/neural.cpp

@@ -72,7 +72,7 @@ Trainer Trainer::Create(Neural::Network network) {
 }
 
 Trainer Trainer::Create(size_t inputCount, size_t hiddenCount,
-                        size_t outputCount, std::function<double()> rand) {
+                        size_t outputCount, RandFcn rand) {
   Vector hidden(hiddenCount);
   Vector output(outputCount);
   Vector gradHidden(hiddenCount);

Cpp/neural.h

@@ -26,6 +26,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 namespace Neural {
 typedef std::vector<double> Vector;
 typedef std::vector<Vector> Matrix;
+typedef std::function<double()> RandFcn;
 struct Network {
   size_t inputCount;
   size_t hiddenCount;
@@ -46,7 +47,7 @@ struct Trainer {
   Vector gradOutput;
   static Trainer Create(Neural::Network network);
   static Trainer Create(size_t inputCount, size_t hiddenCount,
-                        size_t outputCount, std::function<double()> rand);
+                        size_t outputCount, RandFcn rand);
   void Train(const Vector &input, const Vector &output, double lr);
 };
 } // namespace Neural