ENH: Added more iterations in the example x2_fitting

src/examples/x2_fitting.cpp

@@ -21,7 +21,7 @@ int main() {
 
     l4n::MSE mse(&net, &ds);
 
-    l4n::GradientDescent gs(1e-5, 20, 200);
+    l4n::GradientDescent gs(1e-5, 20, 200000);
 
     net.randomize_parameters();
     gs.optimize(mse);