ENH: gradient descent settings fixed

src/examples/main.cpp

@@ -59,7 +59,7 @@ int main(int argc, char** argv){
 
     /* Cross - validation */
     l4n::CrossValidator cv(&gs, &mse);
-    cv.run_k_fold_test(10, 3);
+    cv.run_k_fold_test(1e-3, 100);
 
     /* Save network to the file */
     nn.save_text("test_net.4n");