diff --git a/doc/design/images/graph_construction_example.dot b/doc/design/images/graph_construction_example.dot
index 8d1b673abf6b78c851676fa379dc850c4818f0e5..e115f9844bae6ad24f638c8ed4749cea8aff06a9 100644
--- a/doc/design/images/graph_construction_example.dot
+++ b/doc/design/images/graph_construction_example.dot
@@ -33,7 +33,6 @@ digraph ImageClassificationGraph {
 
         cost -> MSE_Grad [color=red];
         d_cost -> MSE_Grad [color=red];
-        x -> MSE_Grad [color=red];
         l -> MSE_Grad [color=red];
         y -> MSE_Grad -> d_y [color=red];
 
diff --git a/doc/design/images/graph_construction_example_all.png b/doc/design/images/graph_construction_example_all.png
index 181187503472d15779b87284105841168b3945c4..261611a5721f9aa97874f7e6d897fe48cf667db2 100644
Binary files a/doc/design/images/graph_construction_example_all.png and b/doc/design/images/graph_construction_example_all.png differ
diff --git a/doc/design/images/graph_construction_example_forward_backward.png b/doc/design/images/graph_construction_example_forward_backward.png
index 3049a9315fd616464dec54e33064cb75598ca536..4c69687f4a6a181138f3df72ce5e8aa48487b5be 100644
Binary files a/doc/design/images/graph_construction_example_forward_backward.png and b/doc/design/images/graph_construction_example_forward_backward.png differ
diff --git a/doc/design/images/graph_construction_example_forward_only.png b/doc/design/images/graph_construction_example_forward_only.png
index 25d19088cbf0b5f68cf734f2ff21eba8af4a2860..e668c16e0cac73acb4e5dc2b1827557ae77126b4 100644
Binary files a/doc/design/images/graph_construction_example_forward_only.png and b/doc/design/images/graph_construction_example_forward_only.png differ