fixing issue

app.py

@@ -192,7 +192,9 @@ def rebuild_model():
     # Get sorted lists of user and post nodes
     user_nodes = sorted([n for n, attr in G.nodes(data=True) if attr.get('type') == 'user'])
     post_nodes = sorted([n for n, attr in G.nodes(data=True) if attr.get('type') == 'post'])
-    all_nodes = sorted(G.nodes())
+    user_nodes = sorted(n for n, attr in G.nodes(data=True) if attr.get('type') == 'user')
+    post_nodes = sorted(n for n, attr in G.nodes(data=True) if attr.get('type') == 'post')
+    all_nodes = user_nodes + post_nodes
     node2idx = {node: i for i, node in enumerate(all_nodes)}
     
     # Use identity features (one-hot) for all nodes