Update app.py

app.py

@@ -53,7 +53,7 @@ def network_narrator(narrator_id, fst_year, lst_year, yaxis):
     edges = subsetEdges(fst_year, lst_year)
     edges_single = edges[(edges['Teacher_ID']==narrator_id) | (edges['Student_ID']==narrator_id)]
     edges_prepped = splitIsnad(edges_single)
-    net = Network()
+    net = Network(directed =True)
     for _, row in edges_prepped.iterrows():
         source = row['Teacher']
         target = row['Student']